compounds of the formula ##STR1## wherein A is an unsubstituted or hydroxy-substituted straight or branched c1-10 alkylene group or a straight or branched c1-10 alkylene group having an intervening heteroatom selected from oxygen, sulfur and nitrogen;
r2 is hydroxy, halogen, c1-4 alkoxy, nitrile, azido, a quaternary ammonio group, --NR5 r6, ##STR2## azetidinyl, or a 5- or 6-membered heterocyclic group selected from heteroaromatic and heteroalicyclic joined through a carbon atom thereof;
or a non-toxic pharmaceutically acceptable salt thereof, are novel antimicrobial agents which are useful in the treatment of infectious disease in humans and other animals. Novel intermediates and processes for their preparation are also disclosed.
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1. A compound of the formula
wherein r1 is hydrogen, c1-2 alkyl, --CH2 OH, --CH2 NH2, ##STR687## A is an unsubstituted or hydroxy-substituted straight or branched c1-10 alkylene group or a straight or branched c1-10 alkylene group having an intervening heteroatom selected from oxygen, sulfur and nitrogen; r2 is hydroxy, halogen, c1-4 alkoxy, nitrile, azido, a quaternary ammonio group, --NR5 r6, ##STR688## azetidinyl, or a 5- or 6-membered heterocyclic group selected from heteroaromatic and heteroalicyclic joined through a carbon atom thereof; B is a straight or branched c1-6 alkylene group or a direct bond when r3 is joined to the sulfur atom through a carbon atom thereof; r3 is a residue of an organic group; r4 is hydrogen, a removable carboxy-protecting group or a physiologically hydrolyzable ester group; r5 and r6 each are independently hydrogen, c1-6 alkyl, c1-4 alkoxy, hydroxyethyl, azidoethyl, aminoethyl, and when r5 is hydrogen or c1-4 alkyl, r6 is hydroxy, c1-4 alkoxy, amino, c1-4 alkylamino, di(c1-4)-alkylamino, substituted c1-4 alkyl wherein said alkyl substituent is selected from hydroxy, azido, amino, guanidino, nitrile, carboxy, formimidoyl and phenyl, or an acyl residue of an amino acid or peptide; or r5 and r6, taken together with the nitrogen atom to which they are attached, is an unsubstituted or substituted heterocyclic group having 1 to 2 ring members and having up to four heteroatoms in each ring independently selected from oxygen, nitrogen and sulfur, wherein said substituent is selected from the group consisting of c1-4 alkyl, c1-4 alkoxy, trifluoromethyl, hydroxy, halogen, amino, nitrile, carboxy, formimidoyl, carbamido, carbamoyl, c1-4 alkylamino and amino(c1-4)alkyl; W is a direct bond, oxygen, sulfur or NR10 ; Y is oxygen or NR10 ; Z is hydrogen, hydroxy, c1-4 alkyl, c1-4 alkoxy, --NR7 r8, amino(c1-4)alkyl, azido(c1-4)alkyl or hydroxy(c1-4)alkyl; r7 and r8 each are independently hydrogen, c1-4 alkyl, hydroxy, benzyloxy or alkanoyl; and r10 is hydrogen, c1-4 alkyl, c1-4 alkylamino or di(c1-4)alkylamino; or a non-toxic pharmaceutically acceptable salt thereof. 2. A compound of
r2 is hydroxy, halogen, c1-4 alkoxy, nitrile, azido, a quaternary ammonio group, --NR5 r6, ##STR691## azetidinyl, or a 5- or 6-membered heterocyclic group selected from heteroaromatic and heteroalicyclic joined through a carbon atom thereof; B is a straight or branched c1-6 alkylene group or a direct bond when r3 is joined to the sulfur atom through a carbon atom thereof; r3 is hydrogen, c3-6 cycloalkyl or substituted c3-6 cycloalkyl, c5-6 cycloalkenyl or substituted c5-6 cycloalkenyl, phenyl or substituted phenyl, hydroxy, c1-4 alkoxy, c1-4 alkylthio, phenylthio or substituted phenylthio, halogen, nitrile, nitro, --NR7 r8, --⊕R9 r9 r9, ##STR692## or an unsubstituted or substituted heterocyclic group selected from heteroaromatic, heteroalicyclic, ##STR693## having from one to two rings with 4 to 7 ring members in each ring and having up to four heteroatoms in each ring independently selected from oxygen, nitrogen and sulfur, in which said heterocyclic group may be joined through a sulfur atom attached to a carbon atom of said heterocyclic group, wherein said c3-6 cycloalkyl, c5-6 cycloalkenyl, phenyl and heterocyclic substituent is selected from the group consisting of one or two c1-4 alkyl, c1-4 alkoxy, trifluoromethyl, hydroxy, halogen, amino, c1-4 alkylamino, di(c1-4)alkylamino, nitrile, carboxy, formimidoyl, carbamido, carbamoyl, amino(c1-4)alkyl, c1-4 alkylamino(c1-4)alkyl, di(c1-4)alkylamino(c1-4)alkyl, c1-4 alkoxycarbonyl, c1-4 alkoxycarbonyl(c1-4)alkyl, amino(c1-4)alkylamino(c1-4) alkyl and c1-4 alkylcarbonyloxy, and said heterocyclic group may also be substituted with ##STR694## r4 is hydrogen, a removable carboxy-protecting group or a physiologically hydrolyzable ester group; r5 and r6 each are independently hydrogen, c1-6 alkyl, c1-4 alkoxy, hydroxyethyl, azidoethyl, aminoethyl, and when r5 is hydrogen or c1-4 alkyl, r6 is hydroxy, c1-4 alkoxy, amino, c1-4 alkylamino, di(c1-4)alkylamino, substituted (c1-4)alkyl wherein said alkyl substituent is selected from hydroxy, azido, amino, guanidino, nitrile, carboxy, formimidoyl and phenyl, or an acyl residue of an amino acid or peptide; or r5 and r6, taken together with the nitrogen atom to which they are attached, is an unsubstituted or substituted azetidino, or an unsubstituted or substituted 5- or 6-membered heterocyclic group having up to four heteroatoms in each ring independently selected from oxygen, nitrogen and sulfur, wherein said substituent is selected from the group consisting of c1-4 alkyl, c1-4 alkoxy, trifluoromethyl, hydroxy, halogen, amino, nitrile, carboxy, formimidoyl, carbamido, carbamoyl, c1-4 alkylamino and amino(c1-4)alkyl; n is an integer of from 0 to 2; inclusive; W is a direct bond, oxygen, sulfur or NR10 ; Y is oxygen or NR10 ; Z is hydrogen, hydroxy, c1-4 alkyl, c1-4 alkoxy, --NR7 r8, amino(c1-4)alkyl, azido(c1-4)alkyl or hydroxy(c1-4)alkyl; r7 and r8 each are independently hydrogen, c1-4 alkyl, hydroxy, benzyloxy, or alkanoyl; r9 is a c1-4 alkyl or c2-4 alkenyl; and r10 is hydrogen, c1-4 alkyl, c1-4 alkylamino or di(c1-4)alkylamino;
or a non-toxic pharmaceutically acceptable salt thereof. 3. A compound of
r2 is hydroxy, fluoro, c1-4 alkoxy, nitrile, azido, a quaternary ammonio group, --NR5 r6, ##STR697## azetidinyl, or a 5- or 6-membered heterocyclic group selected from heteroaromatic and heteroalicyclic joined through a carbon atom thereof; B is a straight or branched c1-6 alkylene group or a direct bond when r3 is joined to the sulfur atom through a carbon atom thereof; r3 is hydrogen, c3-6 cycloalkyl or substituted c3-6 cycloalkyl, c5-6 cycloalkenyl or substituted c5-6 cycloalkenyl, phenyl or substituted phenyl, hydroxy, c1-4 alkoxy, c1-4 alkylthio, phenylthio or substituted phenylthio, halogen, nitrile, --NR7 r8, ##STR698## or an unsubstituted or substituted heterocyclic group selected from heteroaromatic, heteroalicyclic, ##STR699## having from one to two rings with 5 to 6 ring members in each ring and having up to four heteroatoms in each ring independently selected from oxygen, nitrogen and sulfur, in which said heterocyclic group may be joined through a sulfur atom attached to a carbon atom of said heterocyclic group, wherein said c3-6 cycloalkyl, c5-6 cycloalkenyl, phenyl and heterocyclic substituent is selected from the group consisting of one or two c1-4 alkyl, c1-4 alkoxy, trifluoromethyl, hydroxy, halogen, amino, c1-4 alkylamino, di(c1-4)alkylamino, nitrile, carboxy, formimidoyl, carbamido, carbamoyl, amino(c1-4)alkyl, c1-4 alkylamino(c1-4)alkyl, di(c1-4)alkylamino(c1-4)alkyl, c1-4 alkoxycarbonyl, c1-4 alkoxycarbonyl(c1-4)alkyl, amino(c1-4)alkylamino(c4)alkyl and c1-4 alkylcarbonyloxy, and said heterocyclic group may also be substituted with ##STR700## r4 is hydrogen, a removable carboxy-protecting group or a physiologically hydrolyzable ester group; r5 and r6 each are independently hydrogen and c1-6 alkyl, and when r5 is hydrogen or c1-4 alkyl, r6 is hydroxy, c1-4 alkoxy, amino, c1-4 alkylamino, di(c1-4)alkylamino, substituted (c1-4)alkyl wherein said alkyl substituent is selected from hydroxy, azido, amino, guanidino, nitrile, carboxy, formimidoyl and phenyl, or an acyl residue of an amino acid or peptide; or r5 and r6, taken together with the nitrogen atom to which they are attached, is an unsubstituted or substituted azetidino, or an unsubstituted or substituted 5- or 6-membered heterocyclic group having up to two heteroatoms in each ring independently selected from oxygen, nitrogen and sulfur, wherein said substituent is selected from the group consisting of c1-4 alkyl, hydroxy, amino, nitrile, formimidoyl, c1-4 alkylamino and amino(c1-4)alkyl; n is an integer of from 0 to 2; inclusive; W is a direct bond, oxygen, sulfur or NR10 ; Y is oxygen or NR10 ; Z is hydrogen, hydroxy, c1-4 alkyl, c1-4 alkoxy, NR7 r8, amino(c1-4)alkyl, azido(c1-4)alkyl or hydroxy(c1-4)alkyl; r7 and r8 each are independently hydrogen, c1-4 alkyl, hydroxy, benzyloxy or alkanoyl; r9 is a c1-4 alkyl or c2-4 alkenyl; and r10 is hydrogen, c1-4 alkyl, c1-4 alkylamino or di(c1-4)alkylamino;
or a non-toxic pharmaceutically acceptable salt thereof. 4. A compound of
r3 is hydrogen, c3-6 cycloalkyl or substituted c3-6 cycloalkyl, phenyl or substituted phenyl, hydroxy, c1-4 alkoxy, c1-4 alkylthio, phenylthio or substituted phenylthio, halogen, nitrile, --NR7 r8, ##STR704## or an unsubstituted or substituted heterocyclic group selected from heteroaromatic and heteroalicyclic, having from one to two rings with 5 to 6 ring members in each ring and having up to four heteroatoms in each ring independently selected from oxygen, nitrogen and sulfur, in which said heterocyclic group may be joined through a sulfur atom attached to a carbon atom of said heterocyclic group, wherein said c3-6 cycloalkyl, phenyl and heterocyclic substituent is selected from the group consisting of one or two c1-4 alkyl, c1-4 alkoxy, trifluoromethyl, hydroxy, halogen, amino, c1-4 alkylamino, di(c1-4)alkylamino, nitrile, carboxy, formimidoyl, carbamido, carbamoyl, amino(c1-4)alkyl, c1-4 alkylamino(c1-4)alkyl, di(c1-4)alkylamino(c1-4)alkyl, c1-4 alkoxycarbonyl, c1-4 alkoxycarbonyl(c1-4)alkyl, amino(c1-4)alkylamino(c4)alkyl and c1-4 alkylcarbonyloxy, and said heterocyclic group may also be substituted with ##STR705## r4 is hydrogen, a removable carboxy-protecting group or a physiologically hydrolyzable ester group; r5 and r6 each are independently hydrogen and c1-6 alkyl, and when r5 is hydrogen or c1-4 alkyl r6 is substituted (c1-4)alkyl wherein said alkyl substituent is selected from hydroxy, azido, amino, guanidino, nitrile, carboxy, formimidoyl and phenyl, or an acyl residue of an amino acid or peptide; or r5 and r6, taken together with the nitrogen atom to which they are attached, is an unsubstituted or substituted azetidino, or an unsubstituted or substituted 5- or 6-membered heterocyclic group having up to four heteroatoms in each ring independently selected from oxygen, nitrogen and sulfur, in which said heterocyclic group may be joined through a sulfur atom attached to a carbon atom of said heterocyclic group, wherein said substituent is selected from the group consisting of c1-4 alkyl, amino, formimidoyl, c1-4 alkylamino and amino(c1-4)alkyl; n is an integer of from 0 to 2; inclusive; W is a direct bond, oxygen, sulphur or NR10 ; Y is oxygen or NR10 ; Z is hydrogen, hydroxy, c1-4 alkyl, c1-4 alkoxy, NR7 r8, amino(c1-4)alkyl, azido(c1-4)alkyl or hydroxy(c1-4)alkyl; r7 and r8 each are independently hydrogen, c1-4 alkyl, hydroxy, benzyloxy or alkanoyl; r9 is a c1-4 alkyl or c2-4 alkenyl; and r10 is hydrogen, c1-4 alkyl, c1-4 alkylamino or di(c1-4)alkylamino;
or a non-toxic pharmaceutically acceptable salt thereof. 5. A compound of
r2 is hydroxy, nitrile, azido, --NR5 r6 or ##STR707## B is a straight or branched c1-6 alkylene group or a direct bond when r3 is joined to the sulfur atom through a carbon atom thereof; r3 is hydrogen, substituted c3-6 cycloalkyl, substituted phenyl, hydroxy, c1-4 alkoxy, c1-4 alkylthio, substituted phenylthio, halogen, nitrile, --NR7 r8, ##STR708## or an unsubstituted or substituted heterocyclic group selected from heteroaromatic and heteroalicyclic, having a 5- or 6-membered ring and having up to four heteroatoms in each ring independently selected from oxygen, nitrogen and sulfur, in which said heterocyclic group may be joined through a sulfur atom attached to a carbon atom of said heterocyclic group, wherein said c3-6 cycloalkyl, phenyl and heterocyclic substituent is selected from the group consisting of one or two c1-4 alkyl, c1-4 alkoxy, trifluoromethyl, hydroxy, halogen, amino, c1-4 alkylamino, di(c1-4)alkyl-amino, nitrile, carboxy, formimidoyl, c1-4 alkoxycarbonyl, c1-4 alkoxycarbonyl(c1-4)alkyl, amino(c1-4)alkylamino(c1-4)alkyl and c1-4 alkylcarbonyloxy, and said heterocyclic group may also be substituted with ##STR709## r4 is hydrogen, a removable carboxy-protecting group or a physiologically hydrolyzable ester group; r5 and r6 each are independently hydrogen and c1-6 alkyl, and when r5 is hydrogen or c1-4 alkyl, r6 is substituted (c1-4)alkyl wherein said alkyl substituent is selected from hydroxy, azido, amino, guanidino, nitrile, carboxy, formimidoyl and phenyl, or an acyl residue of an amino acid or peptide; or r5 and r6, taken together with the nitrogen atom to which they are attached, is azetidino, pyrrolidino, pyrrolinio, piperidino, morpholino, thiomorpholino, piperazino, N-methylpiperazino, imidazoyl; n is an integer of from 0 to 2; inclusive; W is a direct bond, oxygen, sulphur or NR10 ; Y is oxygen or NR10 ; Z is hydrogen, hydroxy, c1-4 alkyl, c1-4 alkoxy, NR7 r8, amino(c1-4)alkyl, azido(c1-4)alkyl or hydroxy(c1-4)alkyl; r7 and r8 each are independently hydrogen, c1-4 alkyl, hydroxy, benzyloxy or alkanoyl; r9 is a c1-4 alkyl or c2-4 alkenyl; and r10 is hydrogen, c1-4 alkyl, c4 alkylamino or di(c1-4)alkylamino;
or a non-toxic pharmaceutically acceptable salt thereof. 6. A compound of
r2 is --NR5 r6 or ##STR711## B is a straight or branched c1-4 alkylene group or a direct bond when r3 is joined to the sulfur atom through a carbon atom thereof; r3 is hydrogen, substituted c3-6 cycloalkyl, substituted phenyl, hydroxy, c1-4 alkoxy, c1-4 alkylthio, substituted phenylthio, fluoro, nitrile, --NR7 r8, ##STR712## or an unsubstituted or substituted heterocyclic group selected from heteroaromatic and heteroalicyclic, having a 5- or 6-membered ring and having up to four heteroatoms in each ring independently selected from oxygen, nitrogen and sulfur, wherein said c3-6 cycloalkyl, phenyl and heterocyclic substituent is selected from the group consisting of methyl, methoxy, trifluoromethyl, hydroxy, halogen, amino, c1-4 alkylamino, di(c1-4)alkylamino, nitrile, carboxy, c1-4 alkoxycarbonyl, c1-4 alkoxycarbonyl(c1-4) alkyl, amino(c1-4)alkylamino(c1-4)alkyl and c1-4 alkylcarbonyloxy, and said heterocyclic group may also be substituted with ##STR713## r4 is hydrogen, a removable carboxy-protecting group or a physiologically hydrolyzable ester group; r5 and r6 each are independently hydrogen and c1-6 alkyl, and when r5 is hydrogen or c1-4 alkyl, r6 is substituted (c1-4)alkyl wherein said alkyl substituent is selected from hydroxy, azido, amino, guanidino, nitrile, carboxy, formimidoyl and phenyl, or an acyl residue of an amino acid or peptide; or r5 and r6, taken together with the nitrogen atom to which they are attached, is azetidino, pyrrolidino, pyrrolinio, piperidino, morpholino, thiomorpholino, piperazino, N-methylpiperazino, imidazoyl; n is an integer of from 0 to 2; inclusive; W is a direct bond, oxygen, sulphur or NR10 ; Y is oxygen or NR10 ; Z is hydrogen, hydroxy, c1-4 alkyl, c1-4 alkoxy, NR7 r8, amino(c1-4)alkyl, azido(c1-4)alkyl or hydroxy(c1-4)alkyl; r7 and r8 each are independently hydrogen, c1-4 alkyl, hydroxy, benzyloxy or alkanoyl; r9 is a c1-4 alkyl or c2-4 alkenyl; and r10 is hydrogen, c1-4 alkyl, c1-4 alkylamino or di(c1-4)alkylamino;
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This application is a continuation of Ser. No. 08/196876 filed Feb. 15, 1994 which is a continuation of Ser. No. 08/032818 filed Mar. 15, 1993 which is a continuation of Ser. No. 07/708951 filed May 31, 1991 which is a cip of Ser. No. 07/613921 filed Nov. 20, 1990 which is a cip of Ser. No. 07/466017 Jan. 16, 1990 all now abandoned.
1. Field of the Invention
The present invention relates to novel carbapenem antibiotics having a substituted alkyl group in the 4-position and non-toxic pharmaceutically acceptable salts thereof, which have antimicrobial activity. Therefore, the present carbapenem antibiotics and pharmaceutical compositions thereof are useful in the treatment of antibacterial infections in humans and other animals, either alone or in combination with other antibiotics (class 514, subclass 210). The present invention also provides processes for the preparation of the carbapenem antibiotics and to certain novel intermediates.
2. Nomenclature
The terminology for compounds of this class may either be based upon the root name "carbapenem" which employs a trivial system of nomenclature or on the systematic name according to Chemical Abstracts. In the present invention, the positions are numbered according to the Chemical Abstract system, for example, 3-R3, 4-R2, 6-R1 -7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid as shown in the following Formula ##STR3##
The term "carbapenem", as used herein as a class of compounds, is intended to be used interchangeably with the name 7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid. However, in all instances, the numbering system employed will be the numbering system according to Chemical Abstracts as illustrated above.
3. Disclosure Statement
A great number of carbapenem antibiotics are known in the art. This class of antibiotics is typefied by thienamycin (U.S. Pat. No. 3,950,357, issued Apr. 13, 1976) which was first isolated from fermentation and exhibits a broad spectrum of antibiotic activity. Imipenem (U.S. Pat. No. 4,194,047, issued Mar. 18, 1980), a subsequent chemically more stable derivative of thienamycin, was developed. Clinical utility was limited, however, owing to its rapid decomposition in man by kidney dehydropeptidase (DHP). For this reason, imipenem is clinically administered in combination with a DHP inhibitor. ##STR4##
Despite the broad spectrum of antibiotic activity of imipenem, there still exists a need for more effective carbapenem antibiotics which are both chemically and biologically more stable than imipenem in the treatment of infectious disease. The search for improved carbapenem antibiotics is continuing which is exemplified by the large number of patents that have been granted and published in this field. The closest carbapenem art is represented by the following publications and patents.
European Patent Publication EP-30,032, published on Jun. 10, 1981, discloses a large number of carbapenems having the Formula ##STR5## wherein R1, R2, R6, R7 and R8 are independently selected from the group consisting of inter alia hydrogen, (R1 and R2 are not hydrogen), substituted and unsubstituted: alkyl, alkenyl and alkynyl having from 1-10 carbon atoms. The generic disclosure does not provide any distinction between the various substituents on R1, R2, R6, R7 and R8 except for the proviso that R1 and R2 are not hydrogen.
European Patent Publication EP-45,198, published on Feb. 3, 1982, describes a series of carbapenems having the Formula ##STR6## wherein R1 is an alkyl, aryl, alkylthio, arylthio or acylaminoalkylthio group; R2 and R3 are each independently an alkoxycarbonyl or cyano group or a group of the formula COR1 ; and R3 may further be an alkyl or aryl group. The disclosure provides that the 4-position have two substituents with at least one of which is other than an alkyl group.
European Patent Publication EP-71,908, published on Feb. 16, 1983, discloses a series of carbapenems having the Formula ##STR7## wherein R6 and R7, and R9 and R10 is a group of substituents which are not distinguished but are the same for both groups. Although there is a preferred list of substituents on page 57 for R9 and R10, only methyl is exemplified in the Examples.
European Patent Publication EP-160,391, published on Nov. 6, 1985, describes a series of carbapenems having the Formula ##STR8## wherein R1 and R2 are the same or different and each represents a hydrogen atom (provided that R1 and R2 do not both represent hydrogen atoms), a halogen atom, a C2 -C7 alkoxycarbonyl group or a substituted or unsubstituted C1-10 alkyl, C2 -C6 alkenyl, C2 -C6 alkynyl, C1 -C6 alkoxy, C1 -C6 alkylthio, C3 -C8 cycloalkyl, C6 -C10 carbocyclic aryl, aralkyl, aralkenyl or aralkynyl groups wherein the groups, inter alia, are substituted by various substituents or R1 and R2, together with the carbon atom to which they are attached, form a C3 -C8 alicyclic ring. The only substituents exemplified in the examples for R1 and R2 are those in which R1 and R2 is methyl, methoxy, fluoro and 1,1-dimethyl.
European Patent Publication EP-160,876, published on Nov. 13, 1985, discloses a series of carbapenems having the Formula ##STR9## wherein R9 is halogen, OR, OSO2 R, ##STR10## wherein R is hydrogen, C1-6 alkyl, C2-6 alkenyl, C2-6 alkynyl, phenyl, phenylalkyl having 7-12 carbon atoms, cycloalkyl having 3-6 carbon atoms, cycloalkyl having 3-6 carbon atoms in the ring and 1-6 carbon atoms in the alkyl moiety, heterocyclic groups including heterocyclyl, heterocyclyalkyl, heteroaryl, and heteroarylalkyl; wherein the heterocyclic group is a long list of substituents. Fortunately, there is provided a list of representative substituents for R9 on page 29 which show that the attachment of R9 to the carbapenem ring is by halogen, sulfur, oxygen, nitrogen and phosphorous.
European Patent Publication EP-170,019, published on Feb. 5, 1986, discloses a series of carbapenems substituted in the 4-position with an ether group and having the Formula ##STR11## wherein R1 is lower alkyl, aryl or aryl-lower alkyl and R3 and R4 are conventional substituents for carbapenems. The substituents exemplified in the examples are those wherein R1 is methyl, ethyl, isopentyl and phenyl. However, in Abstract 759 of the Twenty-Seventh Interscience Conference on Antimicrobial Agents and Chemotherapy held on Oct. 4-7, 1987, E. Goetschi one of the inventors of EP-170,019 disclosed some 1β-alkoxy carbapenems of which Ro 19-8928 was specifically exemplified wherein R1 is hydroxyethyl.
Thus, it is the object of the present invention to provide a novel class of antibiotics which have antimicrobial activity and are useful in the treatment of infectious diseases in humans and other animals. Further objects of this invention are to provide chemical processes and intermediates for the preparation of such antibiotics and their non-toxic pharmaceutically acceptable salts and derivatives and to pharmaceutical compositions comprising such antibiotics and methods of treatment by administering such antibiotics and compositions thereof to a human or animal in need thereof.
The present invention provides novel 4-substituted alkyl carbapenem antibiotics having the Formula ##STR12## wherein R1, R2, R3, R4, A and B are as defined below, which are potent inhibitors of microorganisms and are useful as antimicrobial agents in the treatment of infectious disease in humans and other animals. Also included are pharmaceutical compositions comprising said carbapenem antibiotics and to the method of treatment comprising administering said carbapenem antibiotic or pharmaceutical composition thereof. The present invention also provides useful intermediates, processes for their preparation and processes for the preparation of compounds of Formula I.
The present invention provides novel 4-substituted alkyl-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic compounds which are antimicrobial agents useful in the treatment of infectious disease in humans and other animals, and which have the formula ##STR13## wherein R1 is hydrogen, C1-2 alkyl, --CH2 OH, --CH2 NH2, ##STR14## A is an unsubstituted or hydroxy-substituted straight or branched C1-10 alkylene group or a straight or branched C1-10 alkylene group having an intervening heteroatom selected from oxygen, sulfur and nitrogen;
R2 is hydroxy, halogen, C1-4 alkoxy, nitrile, azido, a quaternary ammonio group, --NR5 R6, ##STR15## azetidinyl, or a 5- or 6-membered heterocyclic group selected from heteroaromatic and heteroalicyclic joined through a carbon atom thereof;
B is a straight or branched C1-6 alkylene group or a direct bond when R3 is joined to the sulfur atom through a carbon atom thereof;
R3 is a residue of an organic group;
R4 is hydrogen, a removable carboxy-protecting group or a physiologically hydrolyzable ester group;
R5 and R6 each are independently hydrogen, C1-6 alkyl, C1-4 alkoxy, hydroxyethyl, azidoethyl, aminoethyl, and when R5 is hydrogen or C1-4 alkyl, R6 is hydroxy, C1-4 alkoxy, amino, C1-4 alkylamino, di(C1-4)-alkylamino, substituted C1-4 alkyl wherein said alkyl substituent is selected from hydroxy, azido, amino, guanidino, nitrile, carboxy, formimidoyl and phenyl, or an acyl residue of an amino acid or peptide; or R5 and R6, taken together with the nitrogen atom to which they are attached, is an unsubstituted or substituted heterocyclic group having 1 to 2 ring members and having up to four heteroatoms in each ring independently selected from oxygen, nitrogen and sulfur, wherein said substituent is selected from the group consisting of C1-4 alkyl, C1-4 alkoxy, trifluoromethyl, hydroxy, halogen, amino, nitrile, carboxy, formimidoyl, carbamido, carbamoyl, C1-4 alkylamino and amino(C1-4)alkyl;
W is a direct bond, oxygen, sulfur or NR10 ;
Y is oxygen or NR10 ;
Z is hydrogen, hydroxy, C1-4 alkyl, C1-4 alkoxy, --NR7 R8, amino(C1-4)alkyl, azido(C1-4)alkyl or hydroxy(C1-4)alkyl;
R7 and R8 each are independently hydrogen, C1-4 alkyl, hydroxy, benzyloxy or alkanoyl; and
R10 is hydrogen, C1-4 alkyl, C1-4 alkylamino or di(C1-4)alkylamino;
or a non-toxic pharmaceutically acceptable salt thereof.
This invention also provides stereoselective processes for the preparation of the compounds of Formula I and to novel intermediates in the preparation of compounds of Formula I.
The terms "C1-2 alkyl", "C1-4 alkyl", "C1-6 alkyl", and "C1-4 alkoxy" as used herein and in the claims (unless the context indicates otherwise) mean straight or branched chain alkyl or alkoxy groups such as methyl, ethyl, propyl, isopropyl, butyl, isobutyl, t-butyl, amyl, hexyl, and the like. Preferably, these groups contain from 1 to 4 carbon atoms and, most preferably, they contain 1 or 2 carbon atoms. The term "lower" is intended to mean 1 to 6 carbon atoms, unless otherwise indicted. The term "C3-6 cycloalkyl" as used herein and in the claims means a carbon cyclic ring system such as cyclopropyl, cyclobutyl, cyclopentyl, cycloheptyl and cyclohexyl. The term "C5-6 cycloalkylene" as used herein and in the claims means a cyclic ring system containing an unsaturated bond such as cyclopentene, cyclohexene and the like. The terms "straight or branched C1-10 alkylene group" and "straight or branched C1-6 alkylene group" as used herein and in the claims for "A" and "B", respectively means straight or branched alkylene groups such as methylene, ethylene, propylene, methylethylene, butylene, methylpropylene, ethylethylene, dimethylethylene, pentylene, methylbutylene, ethylpropylene, hexylene, methylpentylene, heptylene, and the like. The term "hydroxy-substituted straight or branched C1-10 alkylene group" as used herein and in the claims for "A" means straight or branched alkylene groups substituted with hydroxy such as 2-hydroxyethylene, 2 or 3-hydroxypropylene, 2,3 or 4-hydroxybutylene, 2 or 3-hydroxy-methyl butylene, 2,3,4 or 5-hydroxypentylene and the like. The term "straight or branched C1-10 alkylene group having an intervening heteroatom selected from oxygen, sulfur and nitrogen" as used herein and in the claims for "A" means straight or branched alkylene group which contains therein an oxygen, sulfur or nitrogen heteroatom such as --(CH2)1-6 --O--(CH2)2-6 --, --(CH2)1-6 --S--(CH2)2-6 --, --(CH2)1-6 --NH--(CH2)2-6 --, --(CH2)1-6 --NCH3 --(CH2)2-6 --, and the like. Unless otherwise specified, the term "halogen" as used herein and in the claims is intended to include bromine, chlorine, iodine and fluorine while the term "halide" is intended to include bromide, chloride and iodide anion. The term "quaternary ammonio group" as used herein and in the claims means a quaternary ammonio group which may be acyclic, cyclic, or a combination of the two, and may contain one or more additional hetero atoms selected from nitrogen, sulfur and oxygen. Suitable acyclic, cyclic and combined acyclic/cyclic quaternary ammonio groups are those illustrated herein and those as defined by --⊕.tbd.Q in U.S. Pat. No. 4,486,586, issued Dec. 4, 1984, which is hereby incorporated by reference.
An example of an acyclic quaternary ammonio group is a group of the formula --⊕R'R"R"' in which R', R" and R"' may be the same or different and may, for example, be (lower)alkyl, (lower)alkenyl or substituted(lower)alkyl. Examples of cyclic quaternary ammonio groups are fully unsaturated monocyclic heterocyclic ring systems, and bicyclic heterocyclic ring systems in which at least one N-containing ring is fully saturated. Suitable cyclic ring systems are, for example, pyridinio, pyrimidinio, pyrazinio, thiazolio, thiadiazolio, quinolinio, isoquinolinio, thiazolo[4,5-c]-pyridinio and the like. Examples of combined acyclic/cyclic quaternary ammonio groups include, for example, 1-methyl pyrrolidino, 1-methyl piperidinio, 1-methyl morpholinio, 1-methyl piperazinio, 1-methyl imidazolidinio and 1-methyl isoindolinio.
The term "acyl residue of an amino acid or peptide" means the acyl residue of a naturally occurring amino acid or a peptide derived therefrom. Suitable amino acids are those described herein and other known amino acids such as alanine, glycine, arginine, cysteine, isoleucine, leucine, lysine, methionine, phenylalanine, proline, threonine and the like. Suitable peptides are those containing naturally occurring amino acids. However, it should be appreciated by those skilled in the art that unnatural amino acids such as those in the D-configuration may be attached to the amino acid of the acyl residue which is in the naturally occurring L-configuration. Preferably, suitable peptides are dipeptides of the natural occurring amino acids such as glycylglycine, glycylleucine, alanylalanine, alanylphenylalanine, alanylglycine and the like. It should also be appreciated by those skilled in the art that the carbapenems of Formula I wherein R2 contains an acyl residue of a naturally occurring amino acid or peptide may be active in vivo as a pro-drug, i.e., the amino acid residue may be hydrolyzed by peptidase enzymes in the host to produce a more active form of the desired carbapenem antibiotic. The compounds of the present invention which contain an acyl residue of an amino acid or peptide are more active in vivo than in vitro. The term "non-toxic pharmaceutically acceptable salt" as used herein and in the claims is intended to include non-toxic acid and base salts, and salts of zwitterionic species. Salts with a base is intended to include inorganic metallic salts such as sodium, potassium, calcium and magnesium, the ammonium salt, and salts with non-toxic amines such as trialkylamines, pyridine, picoline, dibenzylamine, ethanolamine, N-methylmorpholine and other amines which have been used to form salts of carboxylic acids. Salts with an acid is intended to include inorganic acid salts such as hydrochloride, hydrobromide, hydroiodide, sulfate, phosphate, and the like, and organic acid salts such as formate, acetate, maleate, citrate, succinate, ascorbate, lactate, fumarate and tartrate which have been used to form salts of basic amines. Since the compounds of Formula I may also have an acidic or basic group in the R1, R2 and R3 substituents, it is intended that "non-toxic pharmaceutically acceptable salt" include suitable acid or base addition salts of these functional groups such as hydrochloride, phosphate, sodium, potassium, ammonium chloride, acetate and other salts of an acidic group or a basic group as described above. Unless otherwise specified, the term "a physiologically hydrolyzable ester group" as used herein and in the claims is intended to include an ester group which is physiologically acceptable and hydrolyzable under physiological conditions such as C1-6 alkyl, benzyl, 4-methoxybenzyl, (lower)alkanoyloxy(lower)alkyl, e.g., acetoxymethyl, propionyloxymethyl or pivaloxymethyl, (lower)alkoxycarbonyloxy(lower)alkyl, e.g., methoxycarbonyloxymethyl, ethoxycarbonyloxymethyl or 2-methoxycarbonyloxyethyl, (5-methyl-2-oxo-1,3-dioxol-4-yl)methyl and the like.
Carboxy-protecting groups which can be employed in the present invention to block or protect the carboxylic acid function are well-known to those skilled in the art and, preferably, said groups can be removed, if desired, by methods which do not result in any appreciable destruction of the remaining portion of the molecule, for example, by chemical or enzymatic hydrolysis, treatment with chemical reducing agents under mild conditions, irradiation with ultraviolet light or catalytic hydrogenation. Examples of such readily removable carboxy-protecting groups include moieties such as C1-6 alkyl, 2,2,2-trichloroethyl, silyl such as trimethylsilyl and t-butyldimethylsilyl, phenyl, ring substituted phenyl, e.g., 4-chlorophenyl, tolyl, and t-butylphenyl, phenyl(lower)alkyl, ring substituted phenyl(lower)alkyl, e.g., benzyl, 4-methoxybenzyl, 4-nitrobenzyl, benzyhydryl and trityl, methoxymethyl, 2,2,2-trichloroethoxycarbonyl, benzyloxymethyl, (lower) alkanoyloxy(lower)alkyl such as acetoxymethyl, propionyloxymethyl, (lower)alkenyl such as vinyl and allyl, unsubstituted or substituted phenyl(C1-4)alkoxycarbonyl such as benzyloxycarbonyl and 4-nitrobenzyloxycarbonyl, and (C2-4)alkenyloxycarbonyl such as allyoxycarbonyl. Particularly advantageous carboxy protecting groups are benzyl, 4-nitrobenzyl, 2-nitrobenzyl, 2,4-dimethoxybenzyl, 4-methoxybenzyl and the like and, preferably, allyl or substituted allyl. Other suitable protecting groups are disclosed in "Protective Groups in Organic Synthesis", Theodora W. Greene (John Wiley & Sons, 1981), Chapter 5 for carboxy, which is hereby incorporated by reference.
Amino-protecting groups which can be employed in the present invention to block or protect the amino group are well-known to those skilled in the art. Examples of conventional amino-protecting groups are described by J. W. Barton in Protective Groups in Organic Chemistry, J. F. W. McOmie, Ed., Plenum Press, New York, N.Y., 1973, Chapter 2 and by R. A. Boissonnas in Advances in Organic Chemistry, 3, 159-190 (1963). It will be evident to those skilled in the art that the particular amino-protecting group used is not critical and that one need only select a group stable to the subsequent steps of the reaction process, and which is capable of being removed under conditions which preserves the sensitive β-lactam nucleus.
Suitable amino-protecting groups include, for example, acyl groups such as formyl, acetyl and substituted acetyl (e.g., halogenated acetyl), benzoyl and substituted benzoyl, alkoxycarbonyl, halogenated alkoxycarbonyl, alkenyloxycarbonyl, aralkoxycarbonyl, halogenated aralkoxycarbonyl, benzyl and benzyl derivatives, trityl and trityl derivatives, sulfenyl derivatives, sulfonyl derivatives, diacyl derivatives such as phthalimido or succinimido or derivatives thereof and Schiff bases formed with aldehydes or ketones. Specific examples of suitable amino-protecting groups include formyl, acetyl, trifluoroacetyl, trichloroacetyl, benzoyl, toluoyl, 2,2,2-trichloroethoxycarbonyl, isopropoxycarbonyl, t-butoxycarbonyl, cyclopentyloxycarbonyl, cyclohexyloxycarbonyl, benzyloxycarbonyl, 2-nitrobenzyloxycarbonyl, 4-nitrobenzyloxycarbonyl, 4-methoxybenzyloxycarbonyl, 4-chlorobenzyloxycarbonyl, allyloxycarbonyl, 2-furfuryloxycarbonyl, trimethylsilylethoxycarbonyl, N-phenylcarbamoyl, benzyl, 4-nitrobenzyl, trityl, benzenesulfonyl, p-toluenesulfonyl, 2-nitrophenylsulfenyl, phenylthiocarbonyl, trimethylsilyl, triethylsilyl, triphenylsilyl, t-butyldimethylsilyl, methyldiphenylsilyl and diacyl amino-protecting groups such as phthalimido, succinimido and derivatives thereof.
The compounds of the present invention have several asymmetric carbon atoms and can thus exist in several stereochemical forms. The invention includes the mixture of isomers and the individual stereoisomers. Preferred compounds of the Formula I wherein R1 is other than hydrogen are those having the 4R, 5S, 6S configuration on the 1-azabicyclo[3.2.0]heptane ring structure which is the same stereochemical configuration as the antibiotic thienamycin. In addition, the substituents R1 and A may themselves contain asymmetric carbon atoms. Where appropriate, the R1 substituent can exist in either the R or S configuration. It is intended that both the R and S configurations of R1 are included in the present invention, for example, the R and S isomers of 1-hydroxyethyl, 1-fluoroethyl and 1-aminoethyl substituents. Preferably, the R1 substituent is in the R configuration such as 1R-hydroxyethyl and 1R-aminoethyl. In the instance when the alkylene group of substituent A has a branched alkyl substituent or a hydroxy substituent, the compounds of Formula I will have an additional asymmetric carbon atom. It is intended that the present invention include both isomers of the compounds of Formula I, for example, the compounds of Example 57, 58 and 152.
In the definition of R3 the term "a residue of an organic group" as used herein and in the claims means any organic residue containing at least one carbon atom such as methyl. In addition, the organic group is intended to include but not limited to all the organic groups illustrated herein and 3-substituent groups which are known in the carbapenem art. Suitable quaternized nitrogen-containing heterocycles are disclosed in the U.S. Pat. No. 4,642,341, issued Feb. 10, 1987 and U.S. Pat. No. 4,644,061, issued on Feb. 17, 1987, which are hereby incorporated by reference. Other suitable groups are disclosed in U.S. Pat. No. 4,745,188, issued May 17, 1988, especially in the definition of R8 which is hereby incorporated by reference. Additional organic groups suitable in the definition of R3 are disclosed in U.S. Pat. No. 4,822,787, issued Apr. 18, 1989; U.S. Pat. No. 4,840,946, issued Jun. 20, 1989; U.S. Pat. No. 4,863,916, issued Sep. 5, 1989; U.S. Pat. No. 4,888,344, issued Dec. 19, 1989, U.S. Pat. No. 4,952,397, issued Aug. 28, 1990 and U.S. Pat. No. 4,962,103, issued Oct. 9, 1990, which are all hereby incorporated by reference.
Preferably R3 is hydrogen, C3-6 cycloalkyl or substituted C3-6 cycloalkyl, C5-6 cycloalkenyl or substituted C5-6 cycloalkenyl, phenyl or substituted phenyl, hydroxy, C1-4 alkoxy, C1-4 alkylthio, phenylthio or substituted phenylthio, halogen, nitrile, nitro, --NR7 R8, --⊕R9 R9 R9, ##STR16## or an unsubstituted or substituted heterocyclic group selected from heteroaromatic, heteroalicyclic, ##STR17## having from one to two rings with 4 to 7 ring members in each ring and having up to four heteroatoms in each ring independently selected from oxygen, nitrogen and sulfur, in which said heterocyclic group may be joined through a sulfur atom attached to a carbon atom of said heterocyclic group, wherein said C3-6 cycloalkyl, C5-6 cycloalkenyl, phenyl and heterocyclic substituent is selected from the group consisting of one or two C1-4 alkyl, C1-4 alkoxy, trifluoromethyl, hydroxy, halogen, amino, C1-4 alkylamino, di(C1-4)alkylamino, nitrile, carboxy, formimidoyl, carbamido, carbamoyl, amino(C1-4)alkyl, C1-4 alkylamino(C1-4)alkyl, di(C1-4)alkylamino(C1-4)alkyl, C1-4 alkoxycarbonyl, C1-4 alkoxycarbonyl(C1-4)alkyl, amino(C1-4)alkylamino(C1-4)alkyl and C1-4 alkylcarbonyloxy, and said heterocyclic group may also be substituted with ##STR18##
In the definition of R2, the term "azetidinyl" as used herein and in the claims means unsubstituted or substituted and, in the definitions of R2, R3, R5 and R6 of the compounds of Formula I, the term "heterocyclic group" which is unsubstituted or substituted includes the heterocyclic groups illustrated herein and it is also intended to include but not limited to furyl, thienyl, thiazolyl, imidazolyl, imidazolinyl, oxazolyl, oxadiazolyl, thiadiazolyl, triazolyl, tetrazolyl, isoxazolyl, isothiazolyl, pyrrolyl, 3-pyrrolidin-1-yl pyranyl, tetrahydropyranyl, pyrazolyl, pyridyl, pyrimidinyl, tetrahydrofuryl, pyridazinyl, pyrazinyl, triazinyl, azetidinyl, pyrrolidinyl, piperidyl, piperazinyl, thiazolidin-5-yl, morpholinyl, thiomorpholinyl, 1,4-thiazin-2-yl, benzoxazolyl, indolyl, benzimidazolyl, quinolinyl, isoquinolinyl, quinoxalinyl and quinazolinyl, 6,7-dihydro-5H-pyrazolo[1,2-a][1,2,4]triazolium-6-yl wherein said azetidinyl and heterocyclic substituent of R2, R3, R5 and R6 is selected from the group comprising one or two C1-4 alkyl, C1-4 alkoxy, trifluoromethyl, hydroxy, halogen, amino, C1-4 alkylamino, di(C1-4)alkylamino, nitrile, carboxy, formimidoyl, carbamido, carbamoyl, amino(C1-4)alkyl, C1-4 alkylamino, di(C1-4)alkylamino(C1-4)alkyl, C1-4 alkoxycarbonyl, C1-4 alkoxycarbonyl(C1-4)alkyl, C1-4 alkylcarbonyloxy and ##STR19##
Compounds of Formula I wherein R4 is hydrogen, an anionic charge or a physiologically hydrolyzable ester group together with non-toxic pharmaceutically acceptable salts thereof are useful as antimicrobial agents. The remaining compounds of Formula I are valuable intermediates which can be converted into the above-mentioned biologically active compounds.
The carbapenem compounds of Formula I may be prepared by various procedures. In one embodiment, the compounds of Formula I are preferably prepared from novel compounds of Formula II ##STR20## wherein R11 is hydrogen, C1-2 alkyl, --CH2 OH, --CH2 O--P2, --CH2 NH2, --CH2 N--P4, ##STR21## A is an unsubstituted or hydroxy-substituted straight or branched C1-10 alkylene group or a straight or branched C1-10 alkylene group having an intervening heteroatom selected from oxygen, sulfur and nitrogen; P1 is a conventional readily removable carboxy-protecting group; R12 is hydroxy, halogen, C1-4 alkoxy, azido, O--P3, N--P4, N(C1-4 alkyl)-P4, or an optionally protected azetidinyl or 5- or 6-membered heterocyclic group selected from heteroaromatic and heteroalicyclic joined through a carbon atom thereof; P2 and P3 each are independently a conventional hydroxy-protecting group; and P4 is a conventional amino-protecting group.
In another embodiment, the compounds of Formula II may be prepared from novel intermediates of Formula III ##STR22## wherein R11, A, R12 and P1 are as defined above and R18 is hydrogen or P4 in which P4 is a conventional amino-protecting group.
In yet another embodiment, the compounds of Formula III may be prepared from novel intermediates of Formula IV ##STR23## wherein R11, A, R12 and R18 are as defined above.
The compounds of Formula IV may be prepared by various procedures, and, by way of illustration, the process for preparing one of the more preferred embodiments of compounds of Formula IV may be summarized for the preparation of intermediate compounds of Formula IVa by the reaction sequence illustrated in Reaction Scheme I.
In this sequence, the thioester VI which is prepared in Step(A) from the thiol V is converted to the silyl enol ether VII in Step(B), and without separation is coupled, in Step(C), to the azetidinone VIII by nucleophilic displacement of the 4-position leaving group "L". The resulting intermediate IX (illustrated in the β-isomer form) can then be saponified in Step(D) to yield the corresponding carboxylic acid IVa. The general process and methods of the reactions illustrated in Reaction Scheme I is described by the present inventor in U.S. Pat. No. 4,772,683 patented Sep. 20, 1988 and is hereby incorporated by reference. ##STR24##
Referring now to Reaction Scheme 1, Step(A) illustrates the esterification reaction of a thiol V to a thioester VI. The reaction of Step(A) is well-known to those skilled in the art and may be carried out with 2-picolyl mercaptan wherein R is hydrogen or methyl and an appropriately activated carboxy moiety as described herein wherein A and R12 are as previously defined.
Step(B) illustrates the reaction between thioester VI and a triorganosilyl triflate silylating agent to form the silyl enol ether VII. The reaction of Step(B) is carried out in an inert organic solvent and in the presence of an organic base. Suitable inert organic solvents which can be used include methylene chloride, tetrahydrofuran, carbon tetrachloride, cyclohexane, dioxane, dimethoxyethane, diethyl ether and chloroform. Reaction temperatures can be in the range of from about -40°C to +30°C Most conveniently, the reaction is carried out by mixing the reactants under cooling, advantageously between about -15°C and 0°C and then allowing them to gradually warm to room temperature.
Triorganosilyl triflate silylating agents are well known, and include trimethylsilyl trifluoromethanesulfonate, triisopropylsilyl trifluoromethanesulfonate, triethylsilyl trifluoromethanesulfonate, t-butyldimethylsilyl trifluoromethanesulfonate, t-butyldiphenylsilyl trifluoromethanesulfonate, or 2,4,6-tri(t-butylphenoxy)dimethylsilyl trifluoromethanesulfonate. Advantageous results have been obtained using t-butyldimethylsilyl trifluoromethanesulfonate. Thus, P will be the triorganosilyl residue of the particular triorganosilyl triflate silylating agent used.
Suitable organic amine bases include diisopropylethylamine, DBU (1,8-diazabicyclo[5.4.0]undec-7-ene),DBN (1,5-diazabicyclo[4.3.0]non-5-ene), but especially preferred are the tri(C1 -C4)alkylamines such as trimethylamine, triethylamine, tributylamine and tripropylamine. It has been found, however, that in certain instances a stronger base may be necessary to carry out the reaction of Step(A).
Generally, the organic base and triorganosilyl triflate silylating agent are present in an approximately twofold molar excess when compared to the thioester VI, with the base being slightly in excess of the triorganosilyl triflate silyating agent. Reaction times usually vary from about one hour to about five hours, but generally a maximum yield will be obtained in about three hours. Advantageously, the reaction is carried out under an inert atmosphere.
In Step(B), the silyl enol ether VII is reacted with a 4-position substituted azetidinone VIII to yield intermediate IX. The reaction is carried out in the presence of a Lewis acid catalyst and a solvent which is inert in the presence of the Lewis acid catalyst, and preferably under an inert atmosphere.
Suitable inert solvents, which are discussed above, are advantageously dry, and will generally comprise about 10% of the total reaction mixture volume. Dichloromethane has been found to provide satisfactory results.
Suitable Lewis acid catalysts include zinc halides, zirconium halides and boron trifluoride. Zinc chloride has been found to provide satisfactory results.
The silyl enol ether VII is substituted by a group "--A--R12 " wherein A is an unsubstituted or hydroxy-substituted straight or branched C1-10 alkylene group or a straight or branched C1-10 alkylene group having an intervening heteroatom selected from oxygen, sulfur and nitrogen and R12 is hydroxy, halogen, C1-4 alkoxy, azido, O--P3, N--P4, N(C1-4 alkyl)-P4, or an optionally protected azetidinyl or 5- or 6-membered heterocyclic group selected from heteroaromatic and heteroalicyclic joined through a carbon atom thereof in which P3 is a conventional hydroxy-protecting group and P4 is a conventional amino-protecting group.
The 3,4-disubstituted azetidinone intermediates such as that of Formula VIII wherein P2 represents a conventional hydroxy-protecting group and L represents a conventional leaving group are known per se and are key intermediates in the synthesis of carbapenem and penem antibiotics having an (R)-hydroxyethyl substituent at the 6-position of the carbapenem or penem nucleus.
The 4-position substituent of the compound of Formula VIII is designated by "L", which represents a leaving group capable of being displaced by nucleophiclic substitution of the silyl enol ether VII. Such leaving groups include acyloxy (e.g., acetoxy, propionyloxy or t-butyryloxy), halogen (e.g., chloro), arylsulfonyl (e.g., phenylsulfonyl), mesyl and tosyl. Advantageously, "L" is acetoxy because 4-acetoxyazetidinone is a readily available starting material.
The hydroxy-protecting group "P2 " of azetidinone VIII and the hydroxy-protecting group of "P3 " in substituent "R12 " of the silyl enol ether of Formula VII may be the same or different. Preferably, "P2 " and "P3 " are the same and, more preferably, "P", "P2 " and "P3 " are the same.
Hydroxy-protecting groups, which are known to those skilled in the art, are desirable because they prevent side reactions and provide increased yields in later steps of the reaction sequence. Suitable hydroxy-protecting groups may be, for example, acyl groups such as benzyloxycarbonyl, benzhydryloxycarbonyl, trityloxycarbonyl, p-nitro-benzyloxycarbonyl and 2,2,2-trichloroethoxycarbonyl, aralkyl groups such as benzyl, benzhydryl, trityl or p-nitrobenzyl, or triorganosilyl groups such as tri(C1 -C6)alkylsilyl (e.g. trimethylsilyl, triethylsilyl, triisopropylsilyl, isopropyldimethylsilyl, t-butyldimethylsilyl, methyldiisopropylsilyl or methyldi-t-butylsilyl), triarylsilyl (e.g. triphenylsilyl, tri-p-xylsilyl) or triaralkylsilyl (e.g. tribenzylsilyl). Examples of these and other suitable hydroxy-protecting groups and methods for their formation and removal are known in the art, e.g. see Protective Groups in Organic Synthesis, T. W. Greene, John Wiley & Sons, New York 1981, Chapter 2.
The hydroxy-protecting group selected for "P2 " and "P3 " is preferably one that is removable at a later stage of the reaction process. Bulky triorganosilyl groups such as triisopropylsilyl, t-butyldiphenylsilyl or t-butyldimethylsilyl are advantageously employed because they provide for an essentially stereo-controlled reduction step. Such groups can be readily removed under mild conditions, e.g., by treatment with methanolic HCl or with fluoride ion (e.g., tetra-n-butyl ammonium fluoride/tetrahydrofuran), which preserves the sensitive β-lactam nucleus.
The reaction of Step(C) is advantageously carried out under an inert atmosphere, and at a temperature of from about -30°C to about room temperature. Preferably, the reactants are added under cooling, about -15°C to about +5°C, and allowed to react at about 0°-5°C and then, if desired, allowed to gradually warm to room temperature. The reaction can be stirred, if desired, for up to 30 hours to achieve maximum yield.
The β-isomer of the resulting intermediate IX can be separated from the corresponding α-isomer by conventional chromatography or HPLC, or preferably, by crystallization. Alternatively, the β-isomer can be separated from the α-isomer upon saponification of intermediate IX, as discussed below in Step(D), which yields the corresponding carboxylic acid IVa because the β-isomer preferentially crystallizes when the β/α ratio is about 2/1 or greater.
In Step(D), the compound of Formula IX is saponified to yield the corresponding carboxylic acid IVa. Saponification is well-known to those skilled in the art and can be carried out as follows. The compound of Formula IX may first be dissolved in a solvent such as tetrahydrofuran and aqueous tetrahydrofuran and then, under cooling, an excess of inorganic base, such as sodium hydroxide, is added. Hydrogen peroxide may also be added. It is preferred that hydrogen peroxide be added to the saponification reaction and, more preferably, it may be added prior to the addition of the inorganic base. The reaction is usually complete within 1-2 hours at about 0°C to about room temperature and the carboxylic acid IVa is produced upon subsequent acidification with an inorganic acid such as hydrochloric acid.
The process for preparing diazo intermediates of Formula IIIa may conveniently be summarized by Reaction Scheme 2. Briefly, in this reaction sequence, the carboxylic acid moiety of azetidinone IVa is activated and displaced with a mono carboxy-protected magnesium malonate in Step(E) to produce the β-keto ester X which is then followed by diazotization in Step(F) to yield the corresponding diazo intermediate IIIa. ##STR25##
Referring now to Reaction Scheme 2, the reaction of the acid IVa to the keto ester X in Step(E) is conveniently carried out by a 2-step process. The carboxylic acid moiety is first activated by a conventional carboxy-activating group well-known to those skilled in the art and, preferably, with carbonyl-diimidazole in an inert solvent such as tetrahydrofuran, dimethoxyethane, acetonitrile, benzene and toluene, and preferably in benzene or toluene or a mixture of acetonitrile-benzene. Reaction temperatures can be in the range of from about -15°C to about 70°C and, preferably at about 0°-20°C The activated carboxy intermediate may be isolated but it is preferred that the intermediated be reacted in situ under an inert atmosphere in the second step with a magnesium malonate which has been preferably dried prior to use such as azetropically removing any residual water with a Dean-Stark trap. Preferably, the magnesium malonate is a monoalkyl or monoaryl malonate such as monoallyl or substituted allyl malonate, mono benzyl, 2-nitrobenzyl, 4-nitrobenzyl, 4-methoxybenzyl or 2,4-dimethoxybenzyl malonate.
The reaction of a magnesium malonate with the activated carboxy moiety is carried out in an inert organic solvent such as tetrahydrofuran, dioxane, dichloromethane, acetonitrile, benzene and toluene and, preferably, in benzene or acetonitrile at a temperature of about 0°C to about 80°C Advantageously, the reaction is allowed to proceed at about 60°C until the reaction is essentially complete which is usually about 18 hours. Generally, the magnesium malonate is advantageously present in an excess of about 1.1 to about 3.0 mole equivalent per equivalent of acid IVa. The excess of magnesium malonate may be added all at once to the reaction or, if desired, may be added stepwise until the reaction is complete and maximum yield has been achieved.
In Step(F), the keto ester X is diazotized to yield the corresponding diazo intermediate IIIa. Diazotization is well-known in the art and can be carried out in an inert solvent such as acetonitrile, dichloromethane, toluene, benzene and the like. Preferably, the reaction is carried out in acetonitrile with an azide such as 4-carboxybenzenesulfonylazide, p-toluenesulfonylazide, methanesulfonylazide and the like. The reaction is conducted in the presence of a base such as triethylamine, diethylamine, pyridine, lutidine or the like for about 1 to 30 hours at a temperature of about 0° to 50°C
In Reaction Scheme 3, R12, A, P1 and P2 are as previously defined. Generally, the diazo compound of Formula IIIa is cyclized directly in Step(G) to the bicyclic ketone of Formula IIa. Alternatively, if desired, the diazo compound of Formula IIIa is deprotected at the 6-position in Step(H) before cyclization to the bicyclic ketone of Formula IIb. ##STR26##
Cyclization of the diazo compound of Formula IIIa to the bicyclic compound of Formula IIa in Step(G) may be carried out in an inert organic solvent such as tetrahydrofuran, ethyl acetate, benzene, toluene, hexane, cyclohexane or the like at a temperature from about room temperature to about 110°C for 15 minutes to about 5 hours in the presence of a catalyst such as bis(acetylacetonate)Cu(II), copper sulfate, copper powder, rhodium acetate [Rh2 (OAc)4 ], rhodium (II) octanoate, Pd(OAc)2, Pb(OAc)4 and the like and, preferably, rhodium (II) acetate or octanoate. Alternatively, the cyclization may be carried out by irradiation of the compound of Formula IIIa from a light source through a Pyrex filter (wavelength greater than 300 nm) in a solvent such as benzene, diethyl ether or the like at a temperature from about 0° to about room temperature for 30 minutes to about 2 hours.
In an alternate reaction route, the diazo compound of Formula IIIa wherein P2 is preferably a triorganosilyl protecting group and, most preferably, a t-butyldimethylsilyl group is removed in Step(H) by subjecting the compound of Formula IIIa to acidic hydrolysis in a solvent such as acetonitrile, methanol, ethanol, tetrahydrofuran, dioxane and the like in the presence of an acid such as hydrochloric acid, sulfuric acid and acetic acid and, preferably, with about 3 equivalents of 1N aqueous hydrochloric acid at about -10° to about 30°C Preferably, the reaction is carried out from about 0° to about room temperature for about 6 to 18 hours, and, advantageously, at room temperature for 18 hours. The diazo compound of Formula IIIb is then subjected to cyclizing conditions in Step(I) which are the same as those for Step(G) discussed above to yield the bicyclic ketone of Formula IIb.
The compounds of Formula Ia wherein A, B, R3, R4, and R12 are as previously defined may be prepared from the bicyclic ketones of Formula IIa or IIb following the sequence of reactions illustrated in Reaction Scheme 4. It should be appreciated by those skilled in the art that both reaction routes are suitable for the preparation of compounds of Formula Ia. Nevertheless, the choice of reaction route will depend on the starting material to be used such as compounds of Formula IIa or IIb and the definition of the substituents A, B, R3 and R12. Thus Steps(J) and (K) are carried out with and Steps(J') and (K') are carried out without the presence of a hydroxy-protecting group in the substituent at position 6 of the carbapenem nucleus. ##STR27##
To elaborate on the processes of Reaction Scheme 4, Steps(J) and (J') illustrate the acylation or activation of the keto esters IIa and IIb. The reaction of Steps(J) and (J') are well-known to those skilled in the art and may be carried out with suitable acylating agents to provide a leaving group L1 suitable for the displacement reaction of Steps(K) and (K').
Suitable acylating agents to prepare L1 may include acid anhydrides such as acetic acid anhydride, methanesulfonic acid anhydride, p-toluenesulfonic acid anhydride, p-nitrophenylsulfonic acid anhydride, 2,4,6-triisopropylphenylsulfonic acid anhydride, trifluoromethanesulfonic acid anhydride and the like or acid halides such as acetyl chloride, propionyl chloride, diethyl chlorophosphate, diphenyl chlorophosphate, toluenesulfonyl chloride, p-bromophenylsulfonyl chloride and the like or other agents which provide a leaving group L1 by conventional procedures and are well-known in the art. Advantageously, the acylation is carried out with diphenyl chlorophosphate to establish the diphenylphosphonyloxy leaving group at the 2-position of the intermediates XI and XII.
Typically, the acylation reaction of Step(J) or (J') is conducted in an inert organic solvent such as methylene chloride, acetonitrile, dimethylformamide, tetrahydrofuran and the like in the presence of a base such as diisopropylethylamine, triethylamine, 4-dimethylaminopyridine, imidazole, lutidine, N-methylmorpholine, N-methylpiperidine, 1,8-diazabicyclo[5.4.0]undec-7-ene, 1,5-diazabicyclo[4.3.0]non-5-ene and the like, at a temperature from about -20° to 40°C for about 0.5 to 18 hours and preferably for 1 to 3 hours at 0° to room temperature. The intermediates XI and XII may be isolated if desired, but is conveniently used for the next step without isolation or purification.
The intermediates of Formula XI and XII are next converted in Steps(K) and (K') to the intermediates XIII and XIV, respectively, by a conventional displacement reaction. Thus, the intermediates of Formula XI or XII may be reacted with at least an equimolar amount of a mercaptan reagent of the formula
HS--B--R3
wherein B is as previously defined and R3 is a residue of an organic group in an inert organic solvent such as methylene chloride, dioxane, tetrahydrofuran, acetonitrile, dimethylformamide, dimethylsulfoxide, hexamethylene phosphoramide and the like, and preferably, in the presence of a base such as diisopropylethylamine, triethylamine, 4-dimethylaminopyridine, sodium hydrogen carbonate, potassium carbonate and the like. The temperature is not critical for the displacement but is advantageously carried out from about -40° to 30°C for 30 minutes to 24 hours. Most conveniently, the reaction is carried out at about 0° to 5°C for 2 to 4 hours. In the displacement reaction of Step(K'), about an equimolar amount of trimethylsilylchloride may optionally be added to the reaction mixture prior to the addition of said mercaptan reagent to temporarily protect the 1R-hydroxyethyl group. After the displacement is complete, the trimethylsilyl protecting group may readily be removed as described herein for removal of the P2 protecting group and, preferably, by treatment with acetic acid in tetrahydrofuran, tetrahydrofuran-water and the like at about 0°C to room temperature for about 1 to 4 hours.
In Step(L), the compound of Formula XIII is deprotected to produce the compound of Formula XIV. The deprotection is carried out in a conventional manner and when the hydroxy-protecting group is a triorganosilyl group such as t-butyldimethylsilyl, the deprotection is preferably carried out in the presence of a tetra(lower)alkylammonium fluoride such as tetrabutylammonium fluoride. Although the reaction conditions are not critical, it is advantageously carried out with about three equivalents of an ammonium fluoride derivative and optionally in the presence of about six equivalents of glacial acetic acid in an inert organic solvent such as methanol, ethanol, dioxane, acetonitrile, dichloromethane, tetrahydrofuran and the like or a mixture thereof. The deprotection is usually carried out from about -40° to 30°C and, preferably, from -15° to 0°C for about 4 hours to 1 week and preferably for about 3 days.
It should be appreciated by those skilled in the art that the final deblocking step, Step(M), will naturally vary depending on the protecting groups present in substituents P1, R12 and R3. The deblocking Step(M) to remove the carboxy-protecting group P1 of intermediate of Formula XIV to produce compounds of Formula Ia wherein R4 is hydrogen or a non-toxic pharmaceutically acceptable cation such as sodium, potassium, ammonium and other cations of salts described herein is accomplished by conventional procedures such as hydrolysis, chemical reduction or hydrogenation. Where a protecting group such as p-nitrobenzyl, benzyl, benzhydryl or 2-naphthylmethyl is used which can be removed by catalytic hydrogenation, intermediate of Formula XIV in a suitable solvent such as water, dioxane, tetrahydrofuran, ethanol, isopropanol, n-butanol or mixtures thereof containing a buffer solution such as phosphate buffer, dipotassium hydrogen phosphate, sodium bicarbonate, acetate buffer and the like may be treated under a hydrogen pressure of from 1 to about 4 atmospheres in the presence of a hydrogenation catalyst such as palladium on carbon, palladium hydroxide on carbon, platinum oxide, palladium on barium sulfate, Raney nickel and the like at a temperature of from 0° to 50°C for about 15 minutes to 4 hours. When P1 is a group such as σ-nitrobenzyl, photolysis may also be used for deblocking. Protecting groups such as 2,2,2-trichloroethyl may be removed by mild zinc reduction.
When the carboxy-protecting group P1 is an allyl group, it may be removed with a catalyst comprising a palladium compound and preferably a palladium-ligand complex such as tetrakis(triphenylphosphine)palladium[0], bis(dibenzylideneacetone)palladium[0], di[1,2-bis(diphenylphosphino)ethane]palladium[0], tetrakis(triphenyl phosphite)palladium[0] and the like. The reduction is preferably carried out in the presence of an allyl scavenger, for example, an amine such as N-methylaniline or morpholine, an activated methylene compound such as benzoylacetate or 2-methyl-3-oxovaleric acid, an alkanoic acid or a salt thereof such as sodium acetate, sodium 2-ethylhexanoate and the like.
The reaction is usually carried out in a non-reducing solvent such as tetrahydrofuran, water, ethanol, dioxane, acetonitrile, dichloromethane, ethyl acetate or mixtures thereof at a temperature from 0° to 50°C for about 15 minutes to 4 hours. Advantageously, the catalytic reduction is carried out in ethyl acetate or dichloromethane at about 0°C in the presence of tetrakis(triphenylphosphine)palladium[0] containing about 1.1 molar equivalents of potassium ethyl-2-hexanoate. Similarly, other conventional carboxy-protecting groups may be removed by methods known to those skilled in the art. Finally, as mentioned above, compounds of Formula Ia wherein R4 is a physiologically hydrolyzable ester group such as acetoxymethyl, pivaloyloxymethyl and methoxymethyl and the like may be administered directly to the host without deblocking since such esters are hydrolyzed in vivo under physiological conditions.
As mentioned above, the compounds of Formula XIV may optionally contain additional hydroxy-protecting groups O--P3 and/or amino-protecting groups N--P4 wherein P3 and P4 are as previously defined. Thus, reaction Step(M) may, if desired, contain an additional deblocking procedure for removing said protecting groups. The reaction may be carried out by conventional methods known per se for removing a protecting group such as hydrolysis, reduction and the like and includes the methods illustrated for the removal of the carboxy-protecting group P1 and the hydroxy-protecting group P2.
In the particular instance when R12 is azido in the compound of Formula XIV, it may be desired to reduce said azido to an amine in the deblocking procedure of Step(M). The reduction may be carried out in an aqueous or aqueous buffered solution at about pH 6-9 and preferably in an aqueous solution at about -10° to 30°C and preferably at about 0°-5°C under a hydrogen pressure of from 1 to 4 atmospheres in the presence of a hydrogenation catalyst such as 30% palladium on Celite, 10% palladium on carbon, palladium hydroxide on carbon, platinum oxide, 5% palladium on barium sulfate, 5% palladium on alumina and the like, and preferably, on 5% palladium on barium sulfate and 5% palladium on alumina, for about 30 minutes to 3 hours until the reduction is completed.
It should be appreciated by those skilled in the art that the deblocking of the carboxy- and/or hydroxy- and/or amino-protecting groups in Step(M) may be removed at the same time during the reaction. Alternatively, or, if desired, the protecting groups may selectively be removed stepwise. Nevertheless, it should be evident to those skilled in the art that the sequence of removing the protecting groups will depend on the nature and selection of the protecting groups, and whether it is desired to prepare an intermediate of Formula XIV or Formula Ia containing some of the protecting groups such as P1, P2, O--P3 and N--P4 to prepare additional compounds of Formula I.
In another embodiment, the compounds of Formula I may be prepared from novel intermediates of the Formula XVI ##STR28## wherein A, B, R3 and R11 are as previously defined, P1 is a conventional readily removable carboxy-protecting group and L2 is a conventional leaving group.
The compounds of Formula XVI may be used to prepare compounds of Formula I, and, by way of illustration, the process for preparing one of the more preferred embodiments of Formula I is illustrated in Reaction Scheme 5 for the preparation of compounds of Formula Ib. Briefly, the protected intermediate of Formula XIII wherein R12 is O--P3 is selectively deprotected in Step(N) to the alcohol of Formula XV. The alcohol moiety in the 4-position of carbapenem XV is converted in Step(O) to compounds of the Formula XVIa having a conventional leaving group "L2 " which is susceptible to displacement by a nucleophile in Step(P) to produce the compounds of Formula XVIII. Deblocking of the protecting groups in Step(L+M) will yield the compounds of Formula Ib wherein A, B, R3 and R4 are as previously defined and R13 is a nucleophilic residue wherein R13 may be azido, --NR5 R6, ##STR29## nitrile, substituted alkoxy or substituted alkylthio in which R5, R6, Y and Z are as previously defined. ##STR30##
Referring now to Reaction Scheme 5, Step(N) illustrates the removal of a hydroxy-protecting group from the intermediate of Formula XIII wherein R12 is O--P3 in which P3 is a conventional hydroxy-protecting group. Preferably, the protecting group P3 is a triorganosilyl protecting group and, most preferably, is t-butyldimethylsilyl. The reaction of Step(N) is carried out in an inert organic solvent such as tetrahydrofuran, dioxane, ethyl acetate, dimethoxyethane, methylene chloride, carbon tetrachloride, toluene, cyclohexane and the like with about 1 to 10 mole equivalents of tetra(lower)alkyl fluoride, boron trifluoride or potassium fluoride and optionally containing about 1 to 20 equimolar amount of a lower alkyl organic acid, aromatic acid or heteroaromatic acid at a temperature of about -40° to 40°C for about 1 to 60 hours. Advantageously, the reaction is conducted in tetrahydrofuran with about 3 equivalents of tetrabutylammonium fluoride in the presence of about 6 equivalents of acetic acid at a temperature from about -15° to 0°C for about 18 to 24 hours.
Step(O) illustrates the reaction between the alcohol XV and a suitable acylating agent or activating agent to form the intermediate of Formula XVIa having a leaving group "L2 " which can be displaced by a nucleophile. Suitable acylating agents for Step(O) may be the same as the agents used to prepare the leaving group "L1 " in Step(K) of Reaction Scheme 4 or other agents which provide a leaving group by conventional procedures and are well-known in the art. Preferably, L2 includes chloro, bromo, iodo, fluorosulfonyl, --OSO2 R14 and --O⊕P(R15)3 wherein R14 is lower alkyl, trifluoromethyl, phenyl or substituted phenyl and R15 is phenyl or substituted phenyl in which said substituent may be methyl, isopropyl, chloro, bromo or nitro.
The reaction of Step(O) may be conducted in an inert organic solvent such as tetrahydrofuran, dimethoxyethane, dioxane, ethyl acetate, methylene chloride, chloroform, carbon tetrachloride, toluene, benzene, cyclohexane and the like with an acylating or activating agent in the presence of a non-nucleophilic base such as triethylamine, diisopropylethylamine, 2,6-lutidine, 1,8-diazobicyclo[5.4.0]undec-7-ene, 1,5-diazobicyclo[4.3.0]non-5-ene and the like at a temperature of from about -78° to room temperature. Advantageously, the reaction is carried out in methylene chloride with about 1.2 equivalents of trifluoromethanesulfonic anhydride in the presence of about 1.5 to 2 equivalents of diisopropylethylamine at about -78°C or in tetrahydrofuran with a mixture of triphenylphosphine and diethyl azodicarboxylate at about -40°C
Preparation of the desired compounds of Formula XVII is carried out in Step(P) by a nucleophilic displacement of the L2 leaving group of intermediate XVIa by the desired nitrogen, carbon, oxygen or sulfur-containing nucleophile R13 wherein R13 is preferrably as previously defined. The intermediate of Formula XVIa is reacted with at least one equivalent, and preferably an excess, of the desired nucleophilic reagent in an inert organic solvent such as methylene chloride, tetrahydrofuran, chloroform, carbon tetrachloride, dioxane, ethyl acetate, diglyme, dimethoxyethane, cyclohexane, toluene and the like over a wide temperature range from -78° to about 30°C, but preferably from about -15° to 5°C until the reaction is complete as monitored by conventional methods of detection such as thin layer chromatography and high pressure liquid chromatography.
The preparation of the desired carbapenem of Formula Ib is accomplished by deblocking the protecting groups of intermediate XVII by conventional procedures. Suitable deblocking procedures for hydroxy, carboxy and amino-protecting groups are as previously discussed above in the processes of Steps(L) and (M).
In another reaction route, the compounds of Formula Ic may be prepared from the compounds of Formula XVIII in Step(Q) as illustrated in Reaction Scheme 6 wherein A, B, R3, R4 and P2 are as previously defined, R16 is hydrogen or C1-4 alkyl and R17 is C1-4 alkyl or ##STR31##
Generally, the derivatization of the amino group of Formula XVIII or salts thereof is carried out in Step(Q) with suitable imidoylating agents, acylating agents or alkylating agents. The reaction is optionally carried out with compounds of the Formula XVIII wherein P2 is a conventional hydroxy-protecting group and R4 is a conventional carboxy-protecting group. Advantageously, the reaction is carried out without a hydroxy-protecting group (i.e., P2 is hydrogen) and R4 is hydrogen or salt thereof.
Suitable imidoylating agents include formimidates and lower alkylimidates such as methyl formimidate, ethyl formimidate, benzyl formimidate, methyl acetimidate, ethyl propionimidate, ethyl butyrimidate, ethyl pentanimidate and lower alkanimidoyl halide such as formimidoyl chloride, acetimidoyl chloride, propionimidoyl chloride, butyrimidoyl chloride and the like. The reaction is usually carried out in a conventional solvent such as tetrahydrofuran, dioxane, methanol, ethanol, water, buffer solution or a mixture thereof at a temperature from about -20° to 40°C for about 10 minutes to 18 hours. Advantageously, the reaction is carried out in an aqueous phosphate buffer solution at a slightly basic pH for about 10 to 30 minutes at about 5°C
Suitable acylating agents to prepare compounds of Formula Ic include acid halides, acid anhydrides, mixed anhydrides, activated esters, thiolesters and the like such as acetyl chloride, azidoacetyl chloride, acetic anhydride, methyl isocyanate, ethyl isocyanate, N,N-dimethylcarbamoyl chloride, activated esters of N-protected amino acids, aminoiminomethanesulfonic acid, methylaminoiminomethanesulfonic acid and the like. The acylating reaction may be conducted in a variety of solvent systems including solvents such as tetrahydrofuran, dioxane, acetonitrile, ethanol, methanol, dimethylformamide, water and the like and mixtures thereof. It should be appreciated by those skilled in the art that the reaction may be conducted, when necessary, in the presence of a base or acid acceptor such as magnesium oxide, potassium carbonate, potassium bicarbonate, pyridine, lutidine, 2,6-lutidine, 4-dimethylaminopyridine, triethylamine, N,N-diisopropylethylamine and the like. Advantageously, the reaction is conducted in an aqueous organic mixture or aqueous buffered solution at a temperature of from -20° to 50°C for 15 minutes to 18 hours.
Suitable alkylating agents are well-known in the art and include lower alkyl or substituted(lower)alkyl halides, lower alkyl or trifluoromethanesulfonates, formaldehyde, lower alkyl or substituted(lower)alkyl aldehydes, aromatic or heteroaromatic aldehydes, heterocycloalkyl or substituted heterocycloalkyl aldehydes wherein said aldehydes are reacted in the presence of reducing agents such as sodium cyanoborohydride, sodium borohydride and the like. The reaction may be concluded in a variety of solvents systems including tetrahydrofuran, dioxane, acetonitrile, ethanol, methanol, dimethylformamide, water and the like and mixtures thereof at a temperature from about -20° to 50°C for 15 minutes to 20 hours. Advantageously, when the alkylating agent is formaldehyde the reaction is conducted with 37% formaldehyde in the presence of sodium cyanoborohydride in aqueous acetonitrile or aqueous buffered solution at slightly acid condition and at about 0°-5°C for 15 minutes to 10 hours.
As mentioned above, the compounds of Formula XVIII may optionally contain a hydroxy-protecting group and/or a carboxy-protecting group. Thus, Reaction Scheme 6 may contain additional deblocking procedures for removing said protecting groups. Suitable deblocking procedures may be carried out by methods known per se or by the procedures for removal of protecting groups previously described in Steps (L) and (M).
In still another reaction route when it is desired to prepare compounds of Formula I wherein R2 is ##STR32## it is advantageous to convert a compound of Formula XV by controlled or stepwise oxidation to the corresponding aldehydes of Formula I wherein R2 is --CHO or the corresponding acids of Formula I wherein R2 is --CO2 H as illustrated herein or by the use of well-known conventional oxidation procedures. In addition, the aldehydes and acids of Formula I may be converted by standard chemical procedures well-known to those skilled in the art to other derivatives of R2 such as oximes, nitriles, hydrazones, esters, amides, peptides, variations thereof and the like.
The preparation of compounds of Formula I in the present invention is based upon any of several available beta lactam intermediates for the synthesis of carbapenem compounds of the thienamycin series. By way of illustration, the previous Reaction Schemes illustrated the preparation of compounds of Formula I wherein R1 is a 1-hydroxyethyl group in the 6-position of the beta lactam ring structure.
When it is desired to prepare compounds of the Formula I wherein R1 is a 1-aminoethyl group, the process to transform the 1-hydroxyethyl group to a 1-aminoethyl group via a 1-azidoethyl intermediate in the 6-position of the azabicyclo ring structure is illustrated in Reaction Scheme 7 for the preparation of the desired 1(S) and 1(R)-configuration. ##STR33##
The method involves protecting other reaction sensitive substituents with conventional hydroxy, carboxy and/or amino-protecting groups, then reacting the suitable protected 1-hydroxyethyl starting material with triphenylphosphine, hydrazoic acid and diethyl azodicarboxylate (DEAD). The resulting azido group is substituted for the hydroxy group with inversion of configuration relative to the 1-hydroxyethyl starting material. Thus, for example, the 1(S)--OH starting material yields the 1(R)--N3 product, and the 1(R)--OH starting material yields the 1(S)--N3 product. This method was first used by D. F. Corbett et al and described in J. Chem. Soc. Perkin Trans. I, 3011 (1982) and in Tetrahedron Letters, 24, No. 49, 5543-5546 (1983). The reduction of the appropriate 1-azidoethyl intermediate to the corresponding 1-aminoethyl product is advantageously carried out by methods well-known in the art and also as described herein for the reduction of the azido group. Finally, where appropriate, the protecting groups are removed by well-known conventional procedures and the procedures described herein.
In cases where the hydroxyethyl starting material of the require 1(S)-- or 1(R)-- configuration is not readily available, but the related starting material of the opposite configuration is available, the latter can be transformed into the former by the method of O. Mitsunobu, Synthesis, 1-28 (1981) or O. Mitsunobu et al, Bull. Chem. Soc. Japan, 49 510 (1976). This method is similar to the above, and involves the reaction of the hydroxy compound with triphenylphosine, formic acid rather than hydrazoic acid, and diethyl azodicarboxylate to yield the formate ester of opposite configuration, for example, 1(S)--OH yields 1(R)--OCHO, and 1(R)--OH yields 1(S)--OCHO. The formate ester is then hydrolyzed to yield the required hydroxyethyl starting material.
In the case when it is desired to prepare compounds of the Formula I wherein R1 is aminomethyl, the process described above to transform 1-hydroxyethyl to 1-aminoethyl may also be used to transform a beta lactam intermediate wherein R1 is hydroxymethyl to an intermediate wherein R1 is aminomethyl. However, in this instance, there is no difference in the relative configuration.
The preparation of compounds of Formula I wherein R1 is a 1-fluoroethyl group is carried out by reacting a suitable protected 1-hydroxyethyl starting material with diethylaminosulfur trifluoride (DAST). The resulting fluoro group is substituted for the hydroxy group with inversion of configuration relative to the 1-hydroxyethyl starting material, for example, the 1(S)--OH starting material yields the 1(R)--F product, and the 1(R)--OH starting material yields the 1(S)--F product. When the hydroxyethyl starting material of the required 1(S)-- or 1(R)-- configuration is not readily available, but the related starting material of the opposite configuration is available, the latter can be transformed into the former by the method described previously. The method is more fully described by C. P. Mak and K. Wagner, Synthesis of florinated carbapenems. Reaction of monocyclic and bicyclic β-lactams with diethylaminosulfur trifluoride. In "Recent Advances in the Chemistry of β-Lactam Antibiotics" Eds. A. G. Brown and S. M. Roberts, Third International Symposium, pp. 366-370 (1984). The Royal Society of Chemistry, Burlington House, London and references cited therein. More recently, the DAST method and a new method using a mixture of diethylaminohexafluoropropane and diethylaminopentafluoropropene was described by T. Yoshioka et al in Journal of Antibiotics, 42, No. 10, 1520-1522 (1989). Both methods are hereby incorporated by reference.
Other methods for the preparation of intermediates of Formula I wherein R1 is hydrogen, C1-2 alkyl or hydroxymethyl are known per se and may be found in references such as Penems, Synthetic approach to thienamycin analogs by S. Oida in "Recent Advances in the Chemistry of β-Lactam Antibiotics" Ed. G. I. Gregory, Second International Symposium, 1980, and The Chemistry of Thienamycin and other Carbapenem Antibiotics by R. W. Ratcliffe and G. Alkers-Schonberg in "Chemistry and Biology of β-Lactam Antibiotics" Ed. R. B. Morin and M. Gorman, Vol. 2, Academic Press, 1982 which are also incorporated by reference.
Biological Activity and Stability
To illustrate the potent antibacterial activity and the superior chemical and biological stability of the carbapenems of the present invention, a representative member of Examples of the present invention for purposes of illustration are presented in Table I with in vitro activities (MIC), chemical stability (T 1/2) and biological stability (DHPI).
In vitro antibacterial activity was determined by serial 2-fold dilution of the compound in Mueller-Hinton agar and inoculation of the agar surface or broth with an appropriately diluted 18-24 h broth culture. Agar plates and tubes were incubated at 37°C for 17 h, and the lowest concentration causing inhibition of visible growth was considered to be the minimum inhibitory concentration (MIC).
Chemical stability in aqueous solution at pH 7.4 and 37°C is reported as half-life (T 1/2) in hours. These values were determined by the method of Woodward et al, J. Am. Chem. Soc., 102, 2042 (1980).
Biological stability toward renal dehydropeptidase I [renal dipeptidase (EC 3.4.13.11)] decomposition was determined and the values reported are relative to that observed with imipenem. Pure hog renal dipeptidase was prepared as described by Hitchcock et al, J. Anal. Biochem., 163, 219 (1987), while human renal dipeptidase was prepared as described by Campbell et al., J. Biol. Chem., 259, 14586-14590 (1984).
Solutions of carbapenem (0.10 mM) in buffer (50 mM) 4-morpholinepropanesulfonic acid, pH 7.1, were freshly prepared. The UV/vis spectrum of a 2.5 ml aliquot was measured and then 0.025 ml of 1M NH2 OH was added to degrade the β-lactam bond. The spectrum was again measured after 30 min at 25°C for hog dipeptidase and at 37°C for human dipeptidase and again at 5-10 min intervals until no further decrease in absorbance was observed. The different spectrum between intact and degraded β-lactam was used to calculate a λ max and ε. A similar aliquot of carbapenem solution was incubated at 25°C for hog dipeptidase and at 37°C for human dipeptidase and the rate of change in absorbance at λ max was determined. Enzyme was then added to give a rate of at least 10-4 absorbance units per second. The rate of enzymatic hydrolysis was corrected for spontaneous hydrolysis and then converted with ε to nmol min-1 (ml of enzyme)-1. All rates are reported relative to that observed with imipenem.
The compounds of the present invention are significantly less subject to degradation by renal dehydropeptidase (DHP) enzyme as shown in Table I. However, if DHP inhibition is desired or necessary, the compounds of the present invention may be combined or used with known DHP inhibitors such as cilastatin. Although such use is optional it is contemplated to be part of the present invention.
| TABLE I |
| ______________________________________ |
| BIOLOGICAL ACTIVITY AND STABILITY |
| OF REPRESENTATIVE COMPOUNDS |
| Antibacterial Activity MICa |
| Half- Dipeptidase |
| (μg/ml) lifee |
| hydrolysis |
| Example |
| S. pn. E. coli P. aer. |
| (T 1/2) |
| (rel rate) |
| ______________________________________ |
| 3 0.13 0.016 2 3.2 0.04g |
| 19 0.06 0.004 1 117 0.05g |
| 24 0.13 0.016 1 3.5 0.08g |
| 32 0.25 0.004 0.25 76 |
| 36 0.13 0.008 0.25 3.8 0.02g |
| 40 0.06 0.008 1.0 32.5 |
| 41 0.25 0.008 0.5 70 0.7h |
| 44 0.03 0.03 8.0 89 |
| 47 0.5 0.03 1 2.5 0.3h |
| 49 0.008 0.03 63 33.5 |
| 63 0.008 0.016 1 18 0.07h |
| 73 0.03 0.008 0.25 37 |
| 91 0.5 0.016 4.0 150 |
| 92 2.0 0.06 2.0 247 |
| 94 0.06 0.008 8.0 88 |
| 100 0.25 0.008 2.0 180 |
| 117 0.13 0.13 0.25 33 |
| 120 0.03 0.13 0.25 23 |
| 121 0.13 0.004 1 136 |
| 124 0.016 0.03 2 21 |
| 126 0.016 0.008 2 47 |
| 127 0.06 0.13 1 31 |
| 130 0.13 0.13 0.06 16 |
| 131 0.25 0.13 2 46 |
| 135 0.03 0.015 0.06 37 |
| 136 0.015 0.007 4 17 |
| 145 0.125 0.125 8 |
| 146 0.25 0.125 128 |
| 154 0.5 0.25 1 79 |
| 177 0.03 0.13 1 17 |
| 196 0.06 0.016 1 58 |
| 215 0.03 0.015 0.5 49 |
| 263 0.03 0.015 1 9.7 |
| 294 0.03 0.125 0.25 45 |
| 310 0.06 0.03 0.125 27 |
| 315 0.015 0.015 16 137.5 |
| 316 0.015 0.06 0.25 40.5 |
| Imipenem |
| 0.002 0.03 2 15 1g,h |
| ______________________________________ |
| a Minimum Inhibitory Concentration, in MuellerHinton broth. |
| b Streptococcus pneumoniae, A9585 |
| c Escherichia coli, A15119 |
| d Pseudomonas aeruginosa, A9843 |
| e Halflife, 37°C, 10-4 M, pH 7.4, in hours. |
| f Rate of degradation by DeHydroPeptidate I enzyme, relative to |
| Imipenem = 1 (the smaller the number, the more stable to degradation) |
| g Relative rate using hog renal dipeptidase. |
| h Relative rate using human renal dipeptidase. |
As in the case of other β-lactam antibiotics, compounds of general formula I may be converted by known procedures to pharmaceutically acceptable salts which, for purposes of the present invention, are substantially equivalent to the non-salted compounds. Thus, for example, one may dissolve a compound of formula I wherein R4 is an anionic charge in a suitable inert solvent and then add an equivalent of a pharmaceutically acceptable acid. The desired acid addition salt may be recovered by conventional procedures, e.g. solvent precipitation, lyophilization, etc. Where other basic or acidic functional groups are present in the compound of formula I, pharmaceutically acceptable base addition salts and acid addition salts may be similarly prepared by known methods.
A compound of formula I wherein R4 is hydrogen or an anionic charge, or a pharmaceutically acceptable salt thereof may also be converted by conventional procedures to a corresponding compound wherein R4 is a physiologically hydrolyzable ester group, or a compound of formula I wherein R4 is a conventional carboxy-protecting group may be converted to the corresponding compound wherein R4 is hydrogen, an anionic charge or a physiologically hydrolyzable ester group, or a pharmaceutically acceptable salt thereof.
The novel carbapenem derivatives of general formula I wherein R4 is hydrogen, an anionic charge or a physiologically hydrolyzable carboxy-protecting group, or the pharmaceutically acceptable salts thereof, are potent antibiotics active against various gram-positive and gram-negative bacteria and they may be used, for example, as animal feed additives for promotion of growth, as preservatives in food, as bactericides in industrial applications, for example in waterbased paint and in the white water of paper mills to inhibit the growth of harmful bacteria and as disinfectants for destroying or inhibiting the growth of harmful bacteria on medical and dental equipment. They are especially useful, however, in the treatment of infectious disease in humans and other animalscaused by gram-positive or gram-negative bacteria.
The pharmaceutically active compounds of this invention may be used alone or formulated as pharmaceutical compositions comprising, in addition to the active carbapenem ingredient, a pharmaceutically acceptable carrier or diluent. The compounds may be administered by a variety of means; those of principal interest include: orally, topically or parenterally (intravenous or intramuscular injection). The pharmaceutical compositions may be in solid form such as capsules, tablets, powders, etc. or in liquid form such as solutions, suspensions or emulsions. Compositions for injection, the preferred route of delivery, may be prepared in unit dose form in ampules or in multidose containers and may contain formulatory agents such as suspending, stabilizing and dispersing agents. The compositions may be in ready to use form or in powder form for reconstitution at the time of delivery with a suitable vehicle such as sterile water.
The dosage to be administered depends to a large extent on the particular compound being used, the particular composition formulated, the route of administration, the nature and condition of the host and the particular situs and organism being treated. Selection of the particular preferred dosage and route of application, then, is left to the discretion of the physician. In general, however, the compounds may be administered parenterally or orally to mammalian hosts in an amount of from about 5 to 200 mg/kg/day. Administration is generally carried out in divided doses, e.g. two to four times a day.
The following examples which illustrate specific embodiments of the invention are given for illustration and do not limit the scope of the present invention. The abbreviations used in the present invention are conventional abbreviations well-known to those skilled in the art. Some of which are included below.
TBDMS: tert-butyldimethylsilyl
TBDMS-OTf: tert-butyldimethylsilyl trifluoromethanesulfonate
pet-ether: petroleum ether (b.p. 20-60)
TsN3 (TosN3): p-toluenesulfonyl azide
DPCP: ClPO(OPh)2 or diphenyl chlorophosphate
DIPEA: N,N-diisopropylethylamine
TMSCl: trimethylsilyl chloride (chloro trimethylsilane)
DMAP: 4-N,N-dimethylaminopyridine
TsNH2 : p-toluenesulfonamide
TBAF: tetrabutylammonium fluoride
DEAD: diethyl azodicarboxylate
HOBT: 1-hydroxybenzotriazole hydrate
DCC: 1,3-dicyclohexylcarbodiimide
HN3 : hydrazoic acid
In the following examples, all temperatures are given in degrees Centigrade. Melting points were recorded on a Gallenkamp capillary melting point apparatus and boiling points were measured at specific pressures (mm Hg) and both temperatures are uncorrected. Proton magnetic resonance (1 H NMR) spectra were recorded on a Bruker AC-200. All spectra were determined in the solvents indicated and chemical shifts are reported in δ units downfield from the internal standard tetramethylsilane (TMS) and interproton coupling constants are reported in Hertz (HZ). Splitting patterns are designated as follows: S, singlet; d, doublet; t, triplet; q, quartet; m, multiplet; br, broad peak; dd, doublet of doublet; bd, broad doublet, dt doublet of triplet; bs, broad singlet, dq, doublet of quartet. Infrared (IR) spectra were determined on a Perkin Elmer 781 spectrometer from 4000 cm-1 to 400 cm-1 , calibrated to 1601 cm-1 absorption of a polystyrene film and reported in reciprocal centimeters (cm-1). Relative intensities are indicted as follows: s (strong), m (medium) and w (weak). Optical rotations [α]D25 were determined on a Perkin-Elmer 41 polarimeter in the solvents indicated. Ultraviolet spectra were determined on a Hewlett Packard 8451A diode array spectrophotometer in the solvent and concentration indicated.
Analytical thin-layer chromatography (TLC) was carried out on precoated silica gel plates (60F-254, 0.25 mm) and visualized using UV light, iodine vapors and/or staining with one of the following reagents: (a) methanolic phosphomolybdic acid (2%) and heating; (b) reagent (a) followed by 2% cobalt sulphate in 5M H2 SO4 and heating. Column chromatography, also referred to as flash column chromatography, was performed in a glass column using finely divided silica gel (40-63 m on silica gel-H) and pressures somewhat above atomospheric pressure with the indicated solvents. Preparative thin layer chromatography was carried out on precoated silica gel plate (60F-254,2 mm) and visualized using UV light.
Reversed phase analytical thin-layer chromatography was carried out on Analtech precoated reversed phase F (250 microns) plates and visualized suing UV light or iodine vapors.
Reversed phase column chromatography was performed in a glass column using μ Bondapek C18 (55-100 m) prep 500. High pressure liquid chromatography was performed on a Waters 501 HPLC pump using a Varian 2550 UV detector and a Varian 4290 integrator. The column specifications are as follows: μBondapak C18 packing, 30 cm length, 3.9 mm I.D., particle size 10μ and the mobile phase is CH3 CN/aqueous K2 HPO4 0.01M at pH 7.4.
All evaporations of solvents were performed under reduced pressure. As used herein, the term hexanes is a mixture of isomeric C6 hydrocarbons, as specified by the American Chemical Society, petroleum ether refers to the 30°-60°C fractions, and the term "inert" atmosphere is an argon or nitrogen atmosphere unless otherwise indicated.
Sodium (4R,5S,6S)-4-(2"-fluoroethyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(pyridin-2-yl)m ethylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate ##STR34## A. 4-Fluoro-[(pyridin-2-yl)methylthio]butyrate ##STR35##
To a cold (ice bath) solution of 2-mercaptomethyl pyridine (5.26 g, 4.2 mmol) and pyridine (4.1 mL, 50 mmol) in CH2 Cl2 (50 mL) was added dropwise 4-fluorobutyryl chloride (5.23 g, 4.2 mmol) prepared according to the procedure of F. L. Pattison et al. in J. Org. Chem., 21, 887 (1956). The mixture was stirred at 0°C for 1 h, diluted with ethyl acetate (100 mL) washed with cold water (3×100 mL), brine (100 mL) and dried (MgSO4). The crude mixture (9 g) was passed through a silica gel (250 g) pad to give the title compound (7.6 g, 85%) as an oil;
IR (CH2 Cl2) νmax : 1690 cm-1 (C═O);
1 H NMR (CDCl3) δ: 8.55-8.51 (1H, m, pyridine-H), 7.67-7.58 (1H, m, pyridine-H), 7.35-7.31 (1H, bd, J=7.8 Hz, pyridine-H), 7.2-7.12 (1H, m, pyridine-H), 4.61, 4.58, 4.55, 4.37, 4.34, 4.3 (2H, dt, J=5.8 Hz, J=47.1 Hz, CH2 --F), 4.27 (2H, s, CH2 --S), 2.74 (2H, t, J=7.2 Hz, CH2 C═O) and 2.2-1.92 ppm (2H, m, CH2).
B. Enolsilyl ether of 4-fluoro-[pyridin-2-yl)methylthio]butyrate ##STR36##
A cold (ice bath) solution of 4-fluoro-[(pyridin-2-yl)methylthio]butyrate (427 mg, 2.00 mmol) and triethylamine (0.6 mL, 4 mmol) in CH2 Cl2 (10 mL) was treated dropwise with tert-butyldimethylsilyl trifluoromethanesulfonate (0.7 mL, 3 mmol). The ice bath was removed and the mixture was stirred for 5 h, diluted with petroleum ether (50 mL), washed with ice cold water (3×25 mL), brine (25 mL) and dried (MgSO4). The solution was treated with neutral activated charcoal to give the title compound (0.68 g, 100%) as a red oil;
1 H NMR (CDCl3, 200 MHz) δ: 8.56-8.52 (1H, m, aromatic H), 7.67-7.58 (1H, m, aromatic-H), 7.28-7.23 (1H, m, aromatic H), 7.18-7.11 (1H, m, aromatic-H), 5.02 (0.4H, t, J=7.5 Hz, vinylic H), 4.85 (0.6H, t, J=7.2 Hz, vinylic H), 4.40 and 4.16 (d, 2H, dt, J=6.7 Hz, J=47.2 Hz, CH2 F), 4.28, 4.05 (0.8H, dt, J=6.4 Hz, J=47.2 Hz, CH2 F), 4.05 (0.8H, s, CH2 -pyridine), 3.98 (1.2H, s, CH2 -pyridine), 2.5-2.2 (2H, m, CH2), 0.98 and 0.97 (9H, 2s, t-butyl), 0.25 and 0.21 ppm (6H, 2s, dimethyl).
C. (3S,4S)-3-[(1'R)-1'-tert-Butyldimethylsilyloxyethyl]-4-[(1"R)-1"-(pyridin- 2-yl)methylthiocarbonyl-3"-fluoropropyl]azetidin-2-one ##STR37##
To a cold (ice bath) freshly fused ZnCl2 (5.45 g, 40 mmol) under argon was added (3 S,4 R)-4-acetoxy-3-[(1' R)-1'- tert-butyldimethylsilyloxyethyl]azetidin-2-one (5.75 g, 20 mmol) in CH2 Cl2 (60 mL) followed by the dropwise addition of the silylenol ether (14 g, 40 mmol) prepared in Step B in CH2 Cl2 (20 mL). The mixture was stirred for 20 h at 5°C (cold room), then poured over a cold saturated aqueous NaHCO3 solution and extracted with ethyl acetate (2×100 mL). The ethyl acetate extracts were washed with saturated NH4 Cl, brine and dried (MgSO4). The residue upon solvent evaporation was triturated with petroleum ether and filter to give the product (4.0 g, 45%). Recrystallization from ethyl acetate gave the title compound; m.p.=114°-115°C
IR (CH2 Cl2) νmax : 3410 (NH), 1770 and 1680 cm-1 (C═O);
1 H NMR (CDCl3) δ: 8.55-8.52 (1H, m, aromatic-H), 7.68, 7.59 (1H, m, aromatic-H), 7.33-7.29 (1H, bd, J=7.8 Hz, aromatic-H), 7.21-7.14 (1H, m, aromatic-H), 5.86 (1H, bs, NH), 5.71-4.29 (2H, 2 sets of m, CH2 F), 4.277 (2H, s, CH2 S), 4.22-4.11 (1H, m, H-1'), 3.88 (1H, dd, J=2.0 Hz, J=6.7 Hz, H-4), 3.075-2.97 (2H, m, H=3 and H-1"), 2.3-1.8 (2H, 2 sets of m, CH2 -2"), 1.01 (3H, d, J=6.3 Hz, CH3), 0.855 (9H, s, tert-butyl) and 0.048 ppm (6H, s, dimethyl);
Anal. Calcd. for C21 H33 N2 O3 SSiF: C, 57.24; H, 7.55; N, 6.36; S, 7.28. Found: C, 57.01; H, 7.74; N, 6.17; S, 7.24.
D. (3S,4S)-3-[(1'R)-1'-tert-Butyldimethylsilyloxyethyl]-4-[(1"R)-1"-carboxy-3 "-fluoropropyl]azetidin-2-one ##STR38##
A cold (ice bath) solution of (3 S,4 S)-3-[(1' R)-1'- tert-butyldimethylsilyloxyethyl]-4-[(1"R)-1"-(pyridin-2-yl)methylthiocarbo nyl-3"-fluoropropyl]azetidin-2-one (110 mg, 0.25 mmol) in THF (5 mL) was treated with 30% H2 O2 (45 μL, 0.5 mmol) and a 1.0N aqueous NaOH (0.5 mL, 0.5 mmol). The ice bath was removed and the mixture was stirred for 1 h, then diluted with ethyl acetate (20 mL). The mixture was washed with 1N aqueous HCl (1×40 mL), water (3×20 mL), brine (1×20 mL) and dried (MgSO4). Evaporation of the solvent afforded the title compound (82 mg, 100%) as a solid; m.p.=104°-105°C (EtOAc);
IR (CH2 Cl2) νmax : 3410 (NH), 1770 1750 and 1715 cm-1 (C═O);
1 H NMR (CDCl3, 200 MHz) δ: 6.34 (1H, bs, NH), 4.8-4.6 and 4.6-4.35 (2H, 2 sets of m, C H2 F), 4.35-4.1 (1H, m, H-1'), 3.95 (1H, dd, J=1.9 Hz, J=6.0 Hz, H-4), 3.15-3.12 (1H, m, H-3), 2.95-2.8 (1H, m, H=1"), 2.3-1.8 (2H, m, CH2), 1.18 (3H, d, J=6.3 Hz, CH3), 0.87 (9H, s, tert-butyl), 0.072 and 0.063 ppm (6H, 2s, dimethyl);
Anal. Calcd. for C15 H28 NO4 SiF: C, 54.03; H, 8.46; N, 4.20. Found: C, 53.75; H, 8.55; N, 4.05.
E. (3S,4R)-3-[(1'R)-1'-tert-Butyldimethylsilyloxyethyl]-4-[(1"R)-1"-(2-fluoro ethyl)-3"-allyloxycarbonyl-2"-oxopropyl]azetidin-2-one ##STR39##
A suspension (3 S,4 S)-3-[(1' R)-1'- tert-butyldimethylsilyloxyethyl]-4-[(1'R )-1"-carboxy-3"-fluoropropyl]azetidin-2-one (0.75 g, 2.3 mmol) in CH3 CN (15 mL) was treated with carbonyl-diimidazole (0.39 g, 2.4 mmol) and stirred for 1 h at 22°C The resulting acyl imidazole was treated with anhydrous magnesium monoallyl malonate (0.73 g, 2.4 mmol) and stirred for 50 h at 22°C The mixture was diluted with EtOAc (60 mL), washed with cold 1N aqueous HCl (1×60 mL), water (2×60 mL), saturated aqueous NaHCO3 (1×60 mL), water (2×60 mL), brine (60 mL) and dried (MgSO4). Evaporation of solvent left a residue (1.7 g) that was passed through a silica gel (100 g) pad to give the title compound (Hexane→20% EtOAcexane) as an oil (96 mg, 10%).
IR (CH2 Cl2) νmax : 3410 (NH), 1770, 1715, 1655 and 1630 cm-1 (C═O);
1 H NMR (CDCl3, 200 MHz) δ: 6.01, 6.00 (1H, 2 bs, NH), 6.0-5.8 (1H, m, vinylic H), 5.4-5.15 (2H, m, vinylic H), 5.14 (0.5H, s, vinyl H of enol), 4.7-4.6 (2H, m, CH2 -vinyl), 4.7-4.2 (2H, 2 sets of m, C H2 F), 4.21-4.13 (1H, m, H-1'), 3.91 (0.5H, dd, J=2.1 Hz, J=4.4 Hz, H4), 3.88 (0.5H, dd, J=2.1 Hz, J=6.9 Hz, H-4), 3.60 (1H, s, CH2 CO), 3.26-3.17 (0.5H, m, H-1"), 2.99 (0.5H, dd, J=2.2 Hz, J=4.4 Hz, H-3), 2.95-2.92 (0.5H, m, H-3), 2.55-2.35 (0.5H, m, H-1"), 2.3-1.7 (2H, m, CH2), 1.175 and 1.12 (3H, 2d, J=6.28 Hz and J=6.34 Hz, CH3), 0.86 (9H, s, tert-butyl), 0.067 and 0.055 (6H, 2s, dimethyl).
F. (3S,4R)-3-[(1'R)-1'-tert-Butyldimethylsilyloxyethyl]-4-[(1"R)-1"-(2-fluoro ethyl)-3"-diazo-3"-allyloxycarbonyl-2"-oxopropyl]azetidin-2-one ##STR40##
A cold (ice bath) solution of (3 S,4 R)-3-[(1' R)-1'-tert-butyldimethylsilyloxyethyl]-4-[(1"R)-1"-(2-fluoroethyl)-3"-ally loxycarbonyl-2"-oxopropyl]azetidin-2-one (0.20 g, 0.48 mmol) in CH3 CN was treated with triethylamine (64 mL, 0.48 mmol) and p-toluenesulfonyl azide (95 mg, 0.48 mmol). The ice bath was removed and the mixture was stirred for 1 h. Evaporation of CH3 CN gave a semi-solid residue that was triturated with petroleum ether (10 mL). The solid was removed by filtration and the solution was applied on a silica gel column (6 g, 10% EtOAc-hexane) to give the title compound (190 mg, 90%).
IR (CH2 Cl2) νmax : 3410 (NH), 2150 (N2), 1777, 1715 and 1650 cm-1 (C═O);
1 H NMR (CDCl3, 200 MHz) δ: 6.03-5.83 (1H, m, vinylic H), 5.90 (1H, bs, NH), 5.40-5.28 (2H, m, vinylic H), 4.73-4.7 (2H, m, CH2 vinylic) 4.7-4.4, 4.4-4.2 (2H, 2 sets of m, CH2 -F), 4.3-4.1 (2H, m, H-1' and H-1"), 3.90 (1H, dd, J=2.0 Hz, J=5.2 Hz, H-4), 3.06-3.03 (1H, dd, J=2.1 Hz, J=3.5 Hz, H-3), 2.2-2.0, 2.0-1.8 (2H, 2 sets of m, CH2), 1.18 (3H, d, J=6.3 Hz, CH3), 0.86 (9H, s, tert-butyl), 0.061 and 0.051 ppm (6H, 2s, dimethyl).
G. (3S,4R)-3-[(1'R)-1'-Hydroxyethyl]-4-[(1"R)-1"-(2-fluoroethyl)-3"-diazo-3"- allyloxycarbonyl-2"-oxopropyl]azetidin-2-one ##STR41##
A cold (ice bath) solution of (3 S,4 R)-3-[(1' R)-1'- tert-butyldimethylsilyloxyethyl]-4-[(1" R)-1"-(2-fluoroethyl)-3"-diazo-3"-allyloxycarbonyl-2"-oxopropyl]azetidin-2 -one (170 mg, 0.390 mmol) in CH3 CN (2 mL) was treated with a 1N aqueous HCl solution (0.78 mL, 0.78 mmol). The ice bath was removed and the mixture was stirred 4 h. The solvent was removed under vacuum and the residue was diluted with EtOAc (15 mL). The organic phase was washed with 0.1M aqueous NaHCO3 (10 mL), water (10 mL), brine (10 mL) and dried (MgSO4). The solvent was evaporated and the residue was passed through a silica gel (5 g) pad (1:1 ethyl acetate:hexane) to give the title compound (130 mg, 100%).
IR (CH2 Cl2) νmax : 3680, 3600 (OH), 3400 (NH), 2150 (N2), 1765, 1715 and 1650 cm-1 (C═O);
1 H NMR (CDCl3, 200 MHz) δ: 6.04 (1H, bs, NH), 6.0-5.8 (1H, m, vinylic-H), 5.4-5.29 (2H, m, vinylic-H), 4.75-4.71 (2H, m, CH2 -vinylic), 4.7-4.5, 4.5-4.3 (2H, 2 sets of m, CH2 F), 2.2-2.0 (2H, m H-1' and H-1"), 3.88 (1H, dd, J=2.0 Hz, J=6.5 Hz, H-4), 2.98 (1H, dd, J=2.0 Hz, J=7.2 Hz, H-3), 2.34 (1H, d, J=3.6 Hz, OH), 2.4-1.8 (2H, 2 sets of m, CH2), and 1.31 ppm (3H, d, J=6.3 Hz, CH3).
H. Allyl-(2R,4R,5R,6S)-4-(2"-fluoroethyl)-6-[(1'R)-1'-hydroxy-ethyl]-3,7-diox o-1-azabicyclo[3.2.0]heptane-2-carboxylate ##STR42##
A solution of (3 S,4 R)-3-[(1' R)-1'-hydroxyethyl]-4-[(1" R)-1"-(2-fluoroethyl)-3"-diazo-3"-allyloxycarbonyl-2"-oxopropyl]azetidin-2 -one (150 mg, 0.46 mmol) in 25% hexane-ethyl acetate (5 mL) was refluxed for 2.5 h using Rh(OAc)2 as catalyst. The solvent was evaporated to give the title bicyclic ketone (140 mg, 100%).
IR (CH2 Cl2) νmax : 3680, 3600 (OH), 1770, 1745 and 1735 cm-1 (C═O);
1 H NMR (CDCl3, 200 MHz) δ: 6.0-5.80 (1H, m, vinylic-H), 5.4-5.26 (2H, m, vinylic H), 4.79-4.68 (1H, m, HC H-F), 4.69-4.65 (2H, m, CH2 -vinyl), 4.68 (1H, s, H-2), 4.57-4.44 (1H, m, HCHF), 4.37 (1H, dd, J=2.5 Hz, J=8.6 Hz, H-5), 4.38-4.24 (1H, m, H-1'), 3.29 (1H, dd, J=2.5 Hz, J=7.2 Hz, H-6), 3.02-2.9 (1H, m, H-4), 2.3-1.7 (3H, 2 sets of m and bs, CH2 and OH) and 1.39 (3H, d, J=6.3 Hz, CH3).
I. Allyl (4R,5S,6S)-4-(2"-fluoroethyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(pyridin-2-yl)m ethylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate ##STR43##
A cold (ice bath) solution of allyl (2 R,4 R,5 R,6 S)-4-(2"-fluoroethyl)-6-[(1' R)-1'-hydroxyethyl]-3,7-dioxo-1-azabicyclo[3.2.0]heptane-2-carboxylate (0.14 g, 0.55 mmol) in CH3 CN (2 mL) was treated with ClPO(OPh)2 (0.11 mL, 0.50 mmol) and N,N-diisopropylethylamine (0.098 mL, 0.55 mmol) and stirred for 2 h. The resulting enol phosphate was then treated with TMSCl (0.065 mL, 0.5 mmol) and N,N-diisopropylethylamine (0.098 mL, 0.55 mmol), stirred for 15 min and treated finally with 2-picolyl mercaptan (63 mg, 0.55 mmol) and N,N-diisopropylethylamine (0.098 mL, 0.55 mmol). The mixture was stirred for 3 h, diluted with ethyl acetate (20 mL), washed with H2 O (3×10 mL) and dried (MgSO4). The residue obtained upon solvent evaporation was passed through a silica gel (10 g) column (1: ethyl acetate/hexane). The trimethylsilyl ether intermediate obtained (170 mg) was diluted with THF (2 mL), H2 O (1 mL), treated with AcOH (30 μl, 0.46 mmol) and stirred for 1 h. The mixture was diluted with ethyl acetate (20 mL), washed with 1M aqueous NaHCO3 (10 mL), water (10 mL), brine (10 mL) and dried (MgSO4) to give the title material (0.125 g, 69%) as an oil;
IR (CH2 Cl2) νmax : 3600 (OH) 1775 and 1715 cm-1 (C═O);
1 H NMR (CDCl3, 200 MHz) δ: 8.53-8.51 (1H, bd, aromatic H), 7.71-7.62 (1H, m, aromatic H), 7.38, 7.34 (1H, bd, J=7.8 z, aromatic --H), 7.23-7.16 (1H, m, aromatic --H), 6.0-5.85 (1H, m, vinylic --H), 5.47-5.21 (2H, m, vinylic H), 4.86-4.6 (3H, m, CH2 -vinylic and HCHF), 4.52-4.44 (1H, m, HC HF), 4.26-4.19, 4.06, 3.99 (2H, ABq, J=13.9 Hz, CH2 -pyridine), 4.28-4.18 (2H, m, H-1' and H-5), 3.85-3.73 (1H, m, H-4), 3.23 (1H, dd, J=2.7 Hz, J=7.3 Hz, H-6), 2.4-1.6 (3H, m and bs, CH2 and OH) and 1.36 ppm (3H, d, J=6.3 Hz, CH3).
J. Sodium (4R,5S,6S)-4-(2"-fluoroethyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(pyridin-2-yl)m ethylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate ##STR44##
A cold (ice bath) solution of allyl (4 R,5 S,6 S)-4-(2"-fluoroethyl)-6-[(1' R)-1'-hydroxyethyl]-3-[(pyridin-2-yl)methylthio]-7-oxo-1-azabicyclo[3.2.0] hept-2-ene-2-carboxylate (125 mg, 0.320 mmol) in THF (3 mL) was treated with Pd(PPh3)4 (10 mg) and N-methylaniline (60 μl, 0.55 mmol). The ice bath was removed and the mixture was stirred for 1.5 h. The mixture was diluted with EtOAc (20 mL) and extracted with an aqueous 0.05M pH 7.0 phosphate buffer (1×10 mL and 1×5 mL). The aqueous phases were combined, washed with ethyl acetate (10 mL) and passed through a μ-Bondapak C18 column (20 g, H2 O, 2%, 5%, 7%, 10%, CH3 CN2 O) to give the title compound (50 mg, 40%).
Purity by HPLC: 99.23%, retention time 15.90 min (10% CH3 CN/KH2 PO4, 0.01M, pH 7.4);
UV (H2 O) λmax : 266 (6300), 304 (8700);
IR (Nujol) νmax : 1750 and 1600 cm-1 (C═O);
1 H NMR (CDCl3, 200 MHz) δ: 8.47-8.45 (1H, m, aromatic-H), 7.89-7.81 (1H, m, aromatic-H), 7.53-7.49 (1H, bd, J=7.9 Hz, aromatic H), 7.39-7.32 (1H, m, aromatic-H), 4.8-4.6, 4.55-4.35 (2H, 2 sets of m, CH2 -F), 4.24, 4.17, 4.10, 4.03 (2H, ABq, J=13.8 Hz, CH2 -pyridine), 4.3-4.17 (1H, m, H-1'), 4.10 (1H, dd, J=9.5 Hz, J=2.6 Hz, H-5), 3.43 (1H, dd, J=6.1 Hz, J=2.6 Hz, H-6), 3.41-3.29 (1H, m, H-4) and 1.27 ppm (1H, d, J=6.4 Hz, CH3).
(4R,5S,6S)-4-(2"-Aminoethyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(pyridin-2-yl)met hylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR45## 4-Azido-[(pyridin-2-yl)methylthio]butyrate ##STR46##
A cold (ice bath) solution 2-mercaptomethylpyridine (46.5 g, 0.372 mol) in CH2 Cl2 was treated with pyridine (37.5 mL, 0.465 mol), followed by the dropwise addition of 4-azidobutyryl chloride (54.9 g, 0.372 mol) in CH2 Cl2 (100 mL). The mixture was stirred at 5°C for 1 h, diluted with EtOAc (2 L), washed with cold water (500 mL), aqueous 1M NaHSO3 (500 mL), water (500 mL) then with aqueous 1M NaHCO3 (500 mL), water (500 mL) and brine. The residue was passed through a silica gel (900 g) pad to give the title compound (88.9 g, 91%) as an oil.
IR (CH2 Cl2) νmax : 2100 (N3), and 1690 cm-1 (C═O);
1 H NMR (CDCl3, 200 MHz) δ: 8.55-8.52 (1H, m, aromatic H), 7.66-7.58 (1H, m, aromatic H), 7.34-7.31 (1H, bd, aromatic H), 7.19-7.12 (1H, m, aromatic H), 4.26 (2H, s, CH2 -pyridine), 3.335 (2H, t, J=6.6 Hz, CH2 N3), 2.688 (2H, t, J=7.2 Hz, CH2 CO) and 2.03-1.87 ppm (2H, m, CH2).
B. tert-Butyldimethylsilylenol ether of 4-azido-[(pyridin-2-yl)methylthio]butyrate ##STR47##
A cold (ice bath) solution of 4-azido-[(pyridin-2-yl)methylthio]butyrate (191 g, 0.809 mol) in CH2 Cl2 (1L) was treated with triethylamine (141 mL, 1.01 mol) followed by dropwise addition of tert-butyldimethylsilyl trifluoromethanesulfonate (223 mL, 0.970 mol) and stirred for 45 min at about 22°C The mixture was cooled down (ice bath), treated in the same manner with triethylamine and tert-butyldimethylsilyl trifluoromethanesulfonate and stirred for 45 min. This process was repeated once more and the mixture was stirred for 1 h. The mixture was cooled down (ice bath), diluted with cold petroleum ether (2 L), and washed with cold water (4×1 L), 1M aqueous NaHCO3 (5×1 L), water (1 L), brine and dried (MgSO4). The organic phase was treated with charcoal and filtered to give the title compound (327 g, 100%);
1 H NMR (CDCl3, 200 MHz) δ: 8.56-8.53 (1H, m, aromatic H), 7.67-7.59 (1H, m, aromatic H), 7.28-7.25 (1H, bd, aromatic H), 7.18-7.12 (1H, m, aromatic H), 3.989 (0.45H, t, J=7.6 Hz, vinylic H), 4.828 (0.55H, t, J=7.2 Hz, vinylic H), 4.048 (0.9H, s, CH2 -pyridine), 3.978 (1.1H, s, CH2 -pyridine), 3.128 (1.1H, t, J=7.2 Hz, CH2 N3), 3.004 (0.9H, t, J=6.9 Hz, CH2 N3), 2.35-2.22 (2H, m, CH2), 0.985, 0.969 (9H, 2s, tert-butyl), 0.251 and 0.215 ppm (6H, 2s, dimethyl).
C. (3S,4S)-3-[(1'R)-1'-tert-Butyldimethylsilyloxyethyl]-4-[(1'R)-1"-(pyridin- 2-yl)methylthiocarbonyl-3"-azidopropyl]azetidin-2-one ##STR48##
To freshly fused ZnCl2 (38.6 g, 0.284 mol) was added first at 0°C (ice bath), under an Argon atmosphere (3 S,4 R)-4-acetoxy-3-[(1' R)-1'- tert-butyldimethylsilyloxyethyl]azetidin-2-one (40.75 g, 0.142 mol) in CH2 Cl2 (500 mL) and then dropwise a solution of tert-butyldimethylsilylenol ether of 4-azido-[(pyridin-2-yl)methylthio]butyrate (100 g, 0.284 mol) prepared in Step B in CH2 Cl2 140 mL. The mixture was stirred (ice bath) for 1 h then was allowed to stand for 15 h at 5°C (cold room). The mixture was stirred again for 4 h at about 22°C, then diluted with aqueous saturated NH4 Cl (700 mL) and extracted twice with EtOAc (2×1 L). The organic phases were combined, washed with water (3×500 mL), brine (500 mL) and dried (MgSO4). Evaporation of the solvent afforded a residue that was diluted with petroleum ether (200 mL), seeded with title compound and allowed to crystallize for 18 h at 5°C (cold room). The crystals were collected and the mother liquor was purified on a silica gel flash (500 g) pad [8:CH2 Cl2 hexane→50% EtOAc/CH2 Cl2 ] to give a total of 50.5 g (74%) of the title compound; m.p.=95°-6°C (petroleum ether).
IR (CH2 Cl2) νmax : 3400 (NH), 2100 (N3), 1770 and 1680 cm-1 (C═O);
1 H NMR (CDCl3, 200 MHz) δ: 8.55-8.52 (1H, m, aromatic H), 7.67-7.59 (1H, m, aromatic H), 7.34-7.30 (1H, bd, aromatic H), 7.21-7.14 (1H, m, aromatic H), 5.93 (1H, bs, NH), 4.278 (2H, s, CH2 -pyridine), 4.2-4.09 (1H, m, H-1') 3.839 (1H, dd, J=2.1 Hz, J=6.7 Hz, H-4), 3.47-3.22 (2H, m, CH2 -N3), 3.053 (1H, dd, J=2.3 Hz, J=3.3 Hz, H-3), 2.99-2.89 (1H, m, H-1"), 2.09-1.97 (1H, m, HC H), 1.79-1.65 (1H, m, HCH), 1.009 (3H, d, J=6.3 Hz, CH3), 0.852 (9H, s, tert-butyl) and 0.044 (6H, s, dimethyl).
D. (3S,4S)-3-[(1'R)-1'-tert-Butyldimethylsilyloxyethyl]-4-[(1"R)-1"-carboxy-3 "-azidopropyl]azetidin-2-one ##STR49##
A cold (ice bath) solution of (3 S,4 S)-3-[(1' R)-1'- tert-butyldimethylsilyloxyethyl]-4-[(1" R)-1"-(pyridin-2-yl)methylthiocarbonyl-3"-azidopropyl]azetidin-2-one (4.79 g, 10 mmol) in THF (50 mL) was treated with H2 O2 30% (2.58 mL, 30.0 mmol) followed by the dropwise addition of a 1N aqueous NaOH solution (30 mL, 30 mmol). The ice bath was removed and the mixture was stirred for 1 h then cooled again (ice bath). The reaction mixture was acidified with 1N aqueous HCl (60 mL, 60 mmol) and extracted with EtOAc (3×50 mL). The organic extracts were combined, washed with water (50 mL), 1M aqueous NaHSO3, water (50 mL), brine (50 mL) and dried (MgSO4). Evaporation of the solvent afforded the title compound (3.64 g, 98%) as a white solid; m.p.=138°-139°C (diethyl ether, petroleum ether).
IR (CH2 Cl2) νmax : 3410 (NH), 2100 (N3), 1770, 1740 and 1710 cm-1 (C═O);
1 H NMR (CDCl3, 200 MHz) δ: 6.57 (1H, bs, NH), 4.23-4.18 (1H, m, H-1'), 3.932 (1H, dd, J=2.0 Hz, J=5.8 Hz, H-4), 3.52-3.36 (2H, m, CH2 N3), 3.146 (1H, dd, J=1.8 Hz, J=3.7 Hz, H-3), 2.85-2.74 (1H, m, H-1"), 2.1-1.94 (1H, m, HC H), 1.9-1.7 (1H, m, HCH), 1.1830 (3H, t, J=6.3 Hz, CH3), 0.868 (9H, s, tert-butyl), 0.072 and 0.059 ppm (6H, 2s, dimethyl).
E. (3S,4R)-3-[(1'R)-1'-tert-Butyldimethylsilyloxyethyl]-4-[(1"R)-1"-(2-azidoe thyl)-3"-diazo-3"-allyloxycarbonyl-2"-oxopropyl]azetidin-2-one ##STR50##
A suspension of (3 S,4 S)-3-[(1' R)-1'- tert-butyldimethylsilyloxyethyl]-4-[(1" R)-1"-carboxy-3"-azidopropyl]azetidin-2-one (3.56 g, 10 mmol) in anhydrous CH3 CN, under a nitrogen atmosphere, was first treated with carbonyldiimidazole (1.94 g, 12 mmol) and stirred for 30 min. To the clear solution was added monoallyl magnesium malonate (3.73 g, 12 mmol) and the mixture was stirred for 18 h at 60°C Then more malonate (932 mg, 3 mmol) was added and the mixture was heated at 60°C for 4 additional hours. This process was repeated twice with a heating period of 18 and 4 h respectively. Acetonitrile was then evaporated and the residue was taken up in EtOAc (200 mL). This solution was washed with cold water (100 mL), 1N aqueous HCl (100 mL), 10% aqueous Na2 CO3 (100 mL), brine (100 mL) and dried (MgSO4). Evaporation of the solvent afforded crude (3 S,4 R)-3-[(1' R)-1'- tert-butyldimethylsilyloxyethyl)-4-[(1" R)-1"-(2-azidoethyl)-3"-allyloxycarbonyl-2"-oxopropyl]azetidin-2-one (4.2 g, 100%). Part of this crude material (1.85 g, 4.22 mmol) in CH3 CN (19 mL) was cooled down (ice bath), treated successively with triethylamine (0.6 mL, 4.3 mmol) and p-toluenesulfonyl azide (847 mg, 3.2 mmol) and stirred at about 22°C for 3.5 h. The solvent was evaporated and the residue was passed through a silica gel (20 g, CH2 Cl2, 10% EtOAcH2 Cl2) column to give the title compound (1.21 g, 62%) contaminated with a small amount of p-toluenesulfonamide.
IR (CH2 Cl2) νmax : 3410 (NH), 2150 (N2), 2100 (N3), 1765, 1715 and 1645 cm-1 (C═O);
1 H NMR (CDCl3, 200 MHz) δ: 6.1-5.8 (1H, m, vinylic H), 5.87 (1H, bs, NH), 5.41-5.29 (2H, m, vinylic H), 4.75-4.7 (2H, m, CH2), 4.23-4.1 (2H, m, H-1' and H-1"), 3.873 (1H, dd, J=2.1 Hz, J=5.2 Hz, H-4), 3.39-3.24 (2H, m, CH2 N3), 3.049 (1H, dd, J=2.1 Hz, J=3.7 Hz, H-3), 2.21-2.05 (1H, m, HC H), 1.75-1.60 (1H, m, HCH), 1.179 (3H, d, J=6.3 Hz, CH3), 0.864 (9H, s, tert-butyl), 0.064 and 0.052 ppm (6H, 2s, dimethyl).
F. (3S,4R) -3-[(1'R)-1'-Hydroxyethyl]-4-(1"R)-1"-(2-azidoethyl)-3"-diazo-3"-allyloxyc arbonyl-2"-oxopropyl]azetidin-2-one ##STR51##
To a cold (ice bath) solution of (3 S,4 R)-3-[(1' R)-1'- tert-butyldimethylsilyloxyethyl]-4-[(1" R)-1"-(2-azidoethyl)-3"-diazo-3"-allyloxycarbonyl-2"-oxopropyl]azetidin-2- one (1.21 g, 2.61 mmol) in EtOH (20 mL) was added slowly 2N aqueous HCl (2.61 mL, 5.22 mmol). The ice bath was removed and the mixture was stirred for 22 h, then neutralized to pH 7 with 1M aqueous NaHCO3. The mixture was concentrated under vacuum and the residue was taken up in EtOAc (50 mL), washed with water (20 mL), 1M aqueous NaHCO3 (20 mL), brine (20 mL) and dried (MgSO4). The residue was passed through a silica gel (20 g) column (CH2 Cl2 →8:EtOAc/CH2 Cl2) to give the title compound (760 mg, 83%).
IR (CH2 Cl2) νmax : 3600, 3500 (OH) 2150 (N2) 2100 (N3), 1765, 1715 and 1645 cm-1 (C═O);
1 H NMR (CDCl3, 200 MHz) δ: 6.25 (1H, bs, NH), 6.04-5.8 (1H m, vinylic H), 5.4-5.2 (2H, m, vinylic H), 4.9-4.8 (2H, m, CH2), 4.17-4.01 (2H, m, H-1' and H-1"), 3.844 (1H, dd, J=2.1 Hz, J=6.1 Hz, H-4), 3.42-3.2 (2H, m, CH2 N3), 3.017 (1H, dd, J=2.1 Hz, J=6.7 Hz, H-3), 2.5 (1H, bs, OH), 2.2-2.0 (1H, m, HC H), 1.85-1.7 (1H, m, HCH) and 1.286 ppm (3H, d, J=6.4 Hz, CH3).
G. Allyl (2R,4R,5R,6S)-4-(2"-azidoethyl)-6-[(1'R)-1'-hydroxyethyl]-3,7-dioxo-1-azab icyclo[3.2.0]heptane-2-carboxylate ##STR52##
A solution of (3 S,4 R)-3-[(1' R)-1'-hydroxyethyl]-4-[(1"R)-1"-(2-azidoethyl)-3"-diazo-3"-allyloxycarbony l-2"-oxopropyl]azetidin-2-one (350 mg, 1 mmol) and Rh(OAc)2 (6 mg) in EtOAc (15 mL) and hexanes (5 mL) was heated at 80°-85°C (bath temperature) for 2 h. The solvent was removed under vacuum to produce the title compound (340 mg, 100%) as an oil.
1 H NMR (CDCl3, 200 MHz) δ: 6.05-5.9 (1H, m, vinylic H), 5.5-5.2 (2H, m, vinylic H), 4.77 (1H, s, H-2), 4.48-4.6 (2H, m, CH2), 4.329 (1H, dd, J=2.5 Hz, J=8.7 Hz, H-5), 4.3-4.1 (1H, m, H-1'), 3.568 (2H, t, J=6.5 Hz, CH2 N3), 3.234 (1H, dd, J=2.5 Hz, J=8.0 Hz, H-6), 2.95-2.75 (1H, m, H-4), 2.1-1.9 (1H, m, HC H), 1.8-1.6 (1H, m, HCH) and 1.412 ppm (3H, d, J=6.2 Hz, CH3).
H. Allyl (4R,5S,6S)-4-(2"-azidoethyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(pyridin-2-yl)me thylthio]-7-oxo-1-azabicyclo-[3.2.0]hept-2-ene-2-carboxylate ##STR53##
A cold (ice-CH3 OH bath) of allyl (2 R,4 R,5 R,6 S)-4-(2"-azidoethyl)-6-[(1' R)-1'-hydroxyethyl]-3,7-dioxo-1-azabicyclo[3.2.0]heptane-2-carboxylate (338 mg, 1 mmol) in CH3 CN (8 mL) was treated successively with ClPO(OPh)2 (0.23 mL, 1.1 mmol) and N,N-diisopropylethylamine (0.19 mL, 1.1 mmol) and stirred for 45 min. The resulting enol phosphate was then treated with trimethylsilyl chloride (0.14 mL, 1.1 mmol) and N,N-diisopropylethylamine (0.19 mL, 1.1 mmol) and was stirred for another 45 min. The resulting protected enol phosphate was then treated with 2-picolyl mercaptan (250 mg, 2.0 mmol) in CH3 CN (1 mL) and N,N-diisopropylethylamine (0.34 mL, 2.0 mmol) and afterwards was stirred for 2 h. The reaction mixture was diluted with EtOAc (30 mL), washed with cold water (10 mL), 1M aqueous NaHSO3 (10 mL), water (10 mL), 1M aqueous NaHCO3 (10 mL), water (10 mL), brine (10 mL) and dried (MgSO4). The residue after solvent removal was taken up in cold (ice bath) THF (10 mL), treated with 2N aqueous CH3 CO2 H (3 mL, 6 mmol) and stirred for 1 h in cold and 1.5 h at about 22°C The mixture was diluted with ethyl acetate (20 mL), washed with cold water (10 mL), 1M aqueous NaHCO3 (10 mL), water (10 mL), brine and dried (MgSO4). The residue was eluded through a silica gel (15 g) column (CH2 Cl2 →60% EtOAcH2 Cl2) to give the title compound (175 mg, 38%).
IR 3600, 3500-3400 (OH), 2100 (N3), 1775 and 1710 cm-1 (C═O);
1 H NMR (CDCl3, 200 MHz), δ: 8.54-8.51 (1H, m, aromatic H), 7.7-7.6 (1H, m. aromatic H), 7.38, 7.34 (1H, m, aromatic H), 7.25-7.15 (1H, m, aromatic H), 6.1-5.8 (1H, m, allyl H), 5.5 (2H, m, allyl H), 4.8-4.55 (2H, m, CH2 -allyl), 4.294, 4.225, 4.072, 4.002 (2H, ABq, J=14.0 Hz, CH2 -pyridyl), 4.3-4.1 (1H, m, H-1'), 4.166 (1H, dd, J=2.7 Hz, J=9.5 Hz, H-5), 3.8-3.65 (1H, m, H-4), 3.6-3.3 (2H, m, CH2 --N3), 3.162 (1H, dd, J=2.7 Hz, J=7.7 Hz, H-6), 2.2-2 (1H, m, HCH), 1.95 (1H, bs, OH), 1.9-1.6 (1H, m, HC H) and 1.382 ppm (3H, d, J=6.2 Hz, CH3).
I. (4R,5S,6S)-4-(2"-Aminoethyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(pyridin-2-yl)me thylthio]-7-oxo-1-azabicyclo[3.2.0]-hept-2-ene-2-carboxylic acid ##STR54##
A cold (ice bath) solution of allyl (4 R,5 S,6 S)-4-(2"-azidoethyl)-6-[(1' R)-1'-hydroxyethyl]-3-[(pyridin-2-yl)-methylthio]-7-oxo-1-azabicyclo[3.2.0 ]hept-2-ene-2-carboxylate (43 mg, 0.1 mmol) in CH2 Cl2 was treated with (PPh3)4 Pd (21 mg, 0.018 mmol) and with N-methylaniline (0.03 mL, 0.26 mmol). The mixture was stirred for 1 h at about 22°C, diluted with diethyl ether (10 mL), then extracted with a 0.1M aqueous pH 7.0 phosphate buffer solution (2×1.5 mL, 0.15 mmol), water (2×1.5 mL). The aqueous phases were washed with diethyl ether (5 mL) and the pH adjusted to pH 5.9-6.0 with a 1M aqueous pH 4.2 phosphate buffer. The aqueous layer was then hydrogenolyzed at 45-50 p.s.i. and at 5°C to 15°C (temperature at the end of the reaction) for 1 h, using 10% Pd (75 mg) as catalyst. The catalyst was filtered, rinsed with a pH 6 phosphate buffer and purified on a C18 μBondapak (12 g) reversed phase column (2% CH3 CN/H2 O) then repurified in the same way to give the title compound (6 mg, 16%).
Purity by HPLC: 98.11%, retention time=6.08 min. (302 mm, 10% CH3 CN, 0.01M pH 7.4 phosphate buffer);
UV (H2 O) λmax : 266 (4600), 302 (5300);
IR (Nujol) νmax : 1755 and 1590 cm-1 C═O);
1 H NMR (D2 O, 200 MHz) δ: 8.48-8.45 (1H, m, aromatic), 7.9-7.8 (1H, m, aromatic H), 7.51, 7.47 (1H, bd, aromatic H), 7.4-7.33 (1H, m, aromatic H), 4.22, 4.15, 4.09, 4.02 (2H, ABq, J=14.5 Hz, CH2 -picolyl), 4.3-4.14 (1H, m, H-1'), 4.097 (1H, dd, J=2.8 Hz, J=9.6 Hz, H-5), 3.374 (1H, dd, J=2.8 Hz, J=6.6 Hz, H-6), 3.3-3.16 (1H, m, H-4), 3.03 (1H, t, J=7.8 Hz, CH2 N), 2.2-2.05 (1H, m HCH), 1.82-1.6 (1H, m, HCH) and 1.299 ppm (3H, d, J=6.4 Hz, CH3).
(4R,5S,6S)-4-(2"-Aminoethyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(pyridin-2-yl)met hylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR55## A. (3S,4R)-3-[(1'R)-1'-Hydroxyethyl]-4-[(1'R)-1"-(2-azidoethyl)-3"-diazo-3"-p -nitrobenzyloxycarbonyl-2"-oxopropyl]azetidin-2-one ##STR56##
A suspension of (3 S,4 S)-3-[(1'R)-1'- tert-butyldimethylsilyloxyethyl)-4-[(1" R)-1"-carboxy-3"-azidopropyl]azetidin-2-one (100 mg, 0.27 mmol) in CH3 CN (4 mL) was treated with carbonyldiimidazole (52 mg, 0.32 mmol) and stirred for 0.5 h at about 22°C Magnesium monop-nitrobenzyl malonate (200 mg, 0.400 mmol) was added and the mixture was heated at 60°C (bath temperature) for 18 h. The mixture was diluted with EtOAc (20 mL), washed with 1N aqueous HCl (10 mL) water (10 mL), 10% aqueous K2 CO3 (10 mL), brine (10 mL) and dried (MgSO4) to give crude (3 S,4 R)-3-[(1' R)-1- tert-butyldimethylsilyloxyethyl]-4-[(1" R)-1"-(2-azidoethyl)-3"-p-nitrobenzyloxycarbonyl-2"-oxopropyl]azetidin-2-o ne (1.37 g, 92%). Part of this crude material (109 mg, 0.198 mmol) was dissolved in CH3 CN (2 mL) and treated successively with triethylamine (0.030 mL, 0.22 mmol) and p-toluenesulfonyl azide (43 mg, 0.22 mmol) and stirred at about 22°C for 1.3 h. The solvent was evaporated and the residue applied on a preparative TLC plate (diethyl ether) to give after extraction (3 S,4 R)-3-[(1' R)-1'- tert-butyldimethylsilyloxyethyl]-4-[(1" R)-1"-(2-azidoethyl)-3"-diazo-3"-p-nitrobenzyloxycarbonyl-2"-oxopropyl]aze tidin-2-one (Rf 0.71, 84 mg) contaminated with p-toluenesulfonyl azide (65 mg, 57% adjusted yield). A similar mixture (from another reaction) (2.7 g, 4.7 mmol) was dissolved in cold (ice bath) ethanol (40 mL) and treated dropwise with 2N aqueous HCl (4.7 mL, 9.4 mmol). The ice bath was removed and the mixture was stirred for 23 h after which it was neutralized (ice bath) with 1M aqueous NaHCO3 (about 10 mL) and concentrated under vacuum. The residue was diluted with EtOAc (100 mL), washed with cold 1M aqueous NaHCO3 (200 mL) water(20 mL), brine and dried (MgSO4). The residue was passed through a silica gel (30 g) pad (CH2 Cl2 →80% EtOAcH2 Cl2 →EtOAc) to give the title compound (1.45 g, 67%) as a yellow solid.
1 H NMR (CDCl3, 200 MHz) δ: 8.3-8.23 (2H, m, aromatic H), 7.56, 7.52 (2H, bd, J=8.7 Hz, aromatic H), 6.02 (1H, bs, NH), 5.44, 5.37, 5.35, 5.29 (2H, Abq, J=13.1 Hz, CH2), 4.16-4.01 (2H, m, H-1' and H-1"), 3.849 (1H, dd, J=2.2 Hz, J=6.0 Hz, H-4), 3.43-3.25 (2H, m, CH2 N3), 3.041 (1H, dd, J=2.1 Hz, J=6.9 Hz, H-3), 2.3-2.0 (1H, m, HC H), 2.130 (1H, d, J=4.1 Hz, OH), 1.9-1.7 (1H, m, HCH) and 1.30 ppm (3H, d, J=6.3 Hz, CH3).
B. p-Nitrobenzyl (4R,5S,6S)-4-(2"azidoethyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(pyridin-2-yl)met hylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate ##STR57##
A solution of (3 S,4 R)-3-[(1' R)-1'-hydroxyethyl]-4-[(1" R)-1"-[(2-azidoethyl)-3"-diazo-3"-p-nitrobenzyloxycarbonyl-2"-oxopropyl]az etidin-2-one (856 mg, 1.86 mmol) in 3:EtOAc/hexane (40 mL) and Rh(OAc)2 (20 mg) was heated at 80°-85°C (bath temperature) for 1.5 h. The solvent was removed to leave the crude bicyclic ketone: p-nitrobenzyl (2 R,4 R,5 R,6 S)-4-(2"-azidoethyl)-6-[(1' R)-1'-hydroxyethyl]-3,7-dioxo-1-azabicyclo[3.2.0]heptane-2-carboxylate (860 mg, 100%);
1 H NMR (CDCl3, 200 MHz) δ: 8.2 (2H, d, aromatic H), 7.5 (2H, d, aromatic H), 5.4 (1H, s, H-2), 5.3 (2H, center of ABq, CH2 aromatic), 4.3 (1H, dd, H-5), 4.3-4.1 (1H, m, H-1'), 3.5 (2H, t, CH2 N3), 3.3 (1H, dd, H-6), 3.0-2.8 (1H, m, H-4); 2.1-1.9 (1H, m, HC H), 1.9-1.7 (1H, m, HCH), 1.43 (3H, d, CH3).
A cold (ice-CH3 OH bath) solution of the crude ketone (860 mg, 1.86 mmol) in CH3 CN (20 mL) was treated with diphenyl chlorophosphate (0.43 mL, 2.05 mmol) followed by the slow addition of N,N-diisopropylethylamine (0.35 mL, 2.05 mmol) and a trace of 4-dimethylaminopyridine. The mixture was stirred for 30 min after which trimethylsilyl chloride (0.26 mL, 2.05 mmol) and N,N-diisopropylethylamine (0.35 mL, 2.05 mmol) were successively added in and stirring was continued for 30 more min. The resulting O-trimethylsilyl enol phosphate was treated with 2-picolyl mercaptan (517 mg, 4.10 mmol) in CH3 CN (1 mL) followed by the dropwise addition of N,N-diisopropylethylamine (0.70 mL, 0.41 mmol) and stirred for 1 h. The mixture was diluted with EtOAc (40 mL), washed with cold water (20 mL), pH 7.4 phosphate buffer (20 mL), brine (20 mL) and dried (MgSO4). The residue obtained after evaporation of the solvent was taken up in THF (100 mL), cooled to 5°C (ice bath), treated with 2N aqueous CH3 CO2 H (5 mL) and stirred for 2 h. The mixture was diluted with ethyl acetate (25 mL), washed with water, pH 7.5 phosphate buffer (20 mL), brine and dried (MgSO4). The residue was purified on a silica gel flash (20 g) chromatography column (CH2 Cl2 →EtOAc) to give the title compound (500 mg, 49%).
IR (CH2 Cl2) νmax : 3600, 3509, 3400 (OH), 2100 (N3), 1775, 1710 (C═O) and 1525 cm-1 (NO2);
1 H NMR (CDCl3, 200 MHz) δ: 8.54, 8.52 (1H, bd, aromatic H), 8.198 (2H, d, J=8.7 Hz, p-NB ester), 7.7-7.5 (3H, m, and d, J=8.7, aromatic H, p-NB ester), 7.36-7.32 (1H, bd, aromatic H), 7.24-7.17 (1H, m, aromatic H), 5.517, 5.448, 5.230, 5.161 (2H, ABq, J=14.8 Hz, CH2 -pNB), 4.305, 4.236, 4.087, 4.018 (2H, ABq, J=13.9 Hz, CH2 -pyridyl), 4.3-4.2 (1H, m, H-1'), 4.190, 4.177 (part of dd, J=2.6 Hz, part of H-5), 3.85-3.72 (1H, m, H-4), 3.7-3.3 (2H, m, CH2 N3), 3.198 (1H, dd, J=2.6 Hz, J=7.6 Hz, H-6), 2.2-1.95 (1H, m, H-CH), 1.9-1.6 (1H, m, HC HH), 1.64 (1H, bs, OH) and 1.399 ppm (3H, d, J=6.3 Hz, CH3).
C. (4R,5S,6S)-4-(2"-Aminoethyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(pyridin-2-yl)me thylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR58##
A solution of p-nitrobenzyl (4 R,5 S,6 S)-4-(2"-azidoethyl)-6-[(1' R)-1'-hydroxyethyl]-3-[(pyridin-2-yl)methylthio]-7-oxo-1-azabicyclo[3.2.0] hept-2-ene-2-carboxylate (55 mg, 0.1 mmol) in a two phase system of diethyl ether:THF (1:1, 20 mL) and water 0.05M, pH 7.0 phosphate buffer (7 mL+3 mL) was hydrogenolyzed over 10% Pd (84 mg) at 50 psi for 5 h in the cold (ice bath). The catalyst was filtered off and the organic layer was washed with water. The aqueous layers were combined and passed through a μBondapak C18 reversed phase column to give the title compound (6 mg) whose spectral data were identical to the compound prepared in Example 2 Step I.
(4R,5S,6S)-4-[3-(N-Formimidoyl)-aminoethyl]-6-[(1'R)-1'-hydroxyethyl]-3-[(p yridin-2-yl)methylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR59##
A cold (ice bath) solution of sodium (4 R,5 S,6 S)-4-(2"-azidoethyl)-6-[(1' R)-1'-hydroxyethyl]-3-[(pyridin-2-yl)methylthio]-7-oxo-1-azabicyclo[3.2.0] hept-2-en-2-carboxylate (100 mg, 0.24 mmol) in water (12 mL) and a 0.1M pH 6.0 phosphate buffer (7 mL) was hydrogenolyzed for 2 h using 10% Pd as catalyst. The catalyst was filtered off and the pH of the aqueous solution (ice bath) was adjusted to 8.5 with a 1N and 0.1N aqueous NaOH. The mixture was treated portionwise with benzyl formimidate hydrochloride (410 mg, 2.4 mmol) and the pH was kept between 8-8.3 with 0.1N NaOH. The reaction mixture was stirred for 15 min and passed through a μBondapak C18 column (10 g, H2 O→1,2 and 3% CH3 CN/H2 O) to give the title compound (30 mg). The product was repurified on the same material (C18, 6 g) to give pure title compound (13 mg, 13%).
Purity by HPLC: 92.6% (μBondapak C18, 8% CH3 CN/KH2 PO4 0.01M pH 7.4, r.t.=7.095 min);
UV (H2 O) λmax : 304 (6445), 266 (5592);
IR (NuJol) νmax : 1755, 1595 (C═O) and 1715 cm-1 (C═N);
1 H NMR (D2 O, 200 MHz) δ: 8.47, 8.45 (1H, bd, aromatic H), 7.9-7.8 (1H, m, aromatic H), 7.805 (1H, s, C═NH), 7.5-7.2 (2H, m, aromatic H), 4.3-4.1 (1H, m, H-1'), 4.217, 4.141, 4.078, 4.008 (2H, ABq, J=15.2 Hz, CH2 -pyridine), 4.14-4.07 (1H, hidden H-5), 3.5-3.1 (4H, m, H-6, CH2 N, H-4), 2.1-1.1 (1H, m, HCH), 1.75-1.5 (1H, m, HC H) and 1.296 ppm (3H, d, J=6.3 Hz, CH3).
Sodium (4R,5S,6S)-6-[(1'R)-1'-hydroxyethyl]-4-(2"-hydroxyethyl)-3-[(pyridin-2-yl) methylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate ##STR60## A. 4-tert-Butyldimethylsilyloxy-[(pyridin-2-yl)methylthio]butyrate ##STR61##
A cold (ice bath) solution of 4- tert-butyldimethylsilyloxybutyric acid (2.7 g, 13 mmol) and 2-picolyl mercaptan (1.67 g, 13 mmol) in CH2 Cl2 (40 mL) was treated with 1,3-dicyclohexyl carbodiimide (2.8 g, 13 mmol) and 1-hydroxybenzotriazole hydrate (1.81 g, 13 mmol) and stirred at about 22°C for 20 h. The mixture was diluted with ethyl acetate, washed with water, brine and dried (MgSO4). Evaporation of solvent gave a residue which was passed through a silica gel pad (EtOAc:Hexane, 1:3) to give the title compound (3.08 g, 71%).
IR (neat) νmax : 1690 cm-1 C═O;
1 H NMR (CDCl3, 200 MHz) δ: 8.54, 8.52 (1H, bd, aromatic), 7.68, 7.66, 1.63, 7.62, 7.59, 7.58 (1H, dt, aromatic), 7.36, 7.32 (1H, d, aromatic), 7.26, 7.19, 7.166, 7.16, 7.15, 7.13 (1H, m, aromatic), 4.25 (2H, s, CH2), 3.62 (2H, t, J=6.1 Hz, CH2), 2.68 (2H, t, J=7.5 Hz, CH2), 1.90 (2H, center of 5 lines; CH2), 0.87 (9H, s, t-butyl) and 0.019 ppm (6H, s, dimethyl).
B. tert-Butyldimethylsilylenol ether of 4-tert-butyldimethylsilyloxy-[(pyridin-2-yl)methylthio]butyrate ##STR62##
A cold (ice bath) solution of S-(2-picolylthio)4-tert-butyldimethylsilyloxybutyrate (1.3 g, 4.0 mmol) in CH2 Cl2 (15 mL) was treated dropwise with tert-butyldimethylsilyltrifluoromethanesulfonate (1.1 mL, 6.0 mmol), triethylamine (1.14, 8.00 mmol) and stirred for 3 h at room temperature (about 22°C). The mixture was diluted with petroleum ether (60 mL), washed with cold water (3×50 mL), brine (50 mL) and dried (MgSO4). The solution was treated with charcoal, filtered and the solvent was evaporated to give the title compound (1.8 g, 100%) as an oil.
IR (neat) νmax : 1630 cm-1 olefine;
1 H NMR (CDCl3, 200 MHz) δ: 8.54, 8.53, 8.52, 8.51 (1H, d, aromatic-H), 7.30-7.24 (1H, m, aromatic-H), 7.16-7.10 (1H, m, aromatic-H), 6.00 (0.6H, t, J=7.5 Hz, olefinic H), 4.89 (0.4H, t, J=7.1 Hz, olefinic H), 4.04 (1.2H, s, CH2), 3.97 (0.8H, s, CH2), 3.47 (0.8H, t, J=7.1 Hz, CH2), 3.38 (0.8H, t, J=6.8 Hz, CH2), 2.28-2.15 (2H, m, CH2), 0.98, 0.96 (2s, 9H, t-butyl), 0.864, 0.861 (9H, 2s, t-butyl), 0.237, 0.196 (6H, 2s, dimethyl), 0.014 and 0.003 ppm (6H, 2s, dimethyl).
C. (3S,4S)-3-[(1'-R)-1'-tert-Butyldimethylsilyloxyethyl]-4-[(1"R)-1"-(pyridin -2-yl)methylthtocarbonyl-3"-tert-butyl dimethylsilyloxypropyl]azetidin-2-one ##STR63##
To a cold (ice bath) freshly fused ZnCl2 (545 mg, 4 mmole) under Argon was added (3 S,4 R)-4-acetoxy-3-[(1'R)-1'-tert-butyl-dimethylsilyloxyethyl]azetidin-2-one (575 mg, 2 mmol) in CH2 Cl2 (10 mL) followed by the dropwise addition of the silylenol ether (1.8 g, 4 mmol) prepared in Step B in CH2 Cl2 (5 mL). The mixture was stirred at 5°C for 18 h, diluted with ethyl acetate (60 mL), washed with saturated aqueous NaHCO3 (50 mL), saturated aqueous NH4 Cl (50 mL), brine (50 mL) and dried (MgSO4). The residue upon evaporation of solvent was purified on a silica gel column (80 g, 1:5 ethyl acetateexane) to give the title compound as a solid (500 mg, 45%) m.p.=103°-105°C (hexane).
IR (CH2 Cl2) νmax : 3410 (NH) 1765 and 1680 cm-1 (C═O);
1 H NMR (CDCl3, 200 MHz) δ: 8.54-8.51 (1H, m, aromatic H), 7.66-7.57 (1H, m, aromatic H), 7.34 (1H, d, J=7.8 Hz, aromatic H), 7.20-7.12 (1H, m, aromatic H); 5.99 (1H, bs, NH), 4.24 (2H, s, CH2), 4.2-4.09 (1H, m, H-1'), 3.83 (1H, dd, J=2.0 Hz, J=6.9 Hz, H-4), 3.73-3.49 (2H, m, CH2 O), 3.04-2.94 (2H, m, H-1" and H-3), 2.01-1.89 (1H, m, H-2"), 1.80-1.64 (1H, m, H-2"), 1.00 3H, d, J=6.4 Hz, CH3), 0.861, 0.850 (18H, 2s, tert-butyl), 0.040 and 0.004 ppm (12H, 2s, dimethyl);
Anal. Calcd. for C27 H47 N2 O4 SSi2 : C 58.76, H 8.58, N 5.08, S 5.81. Found: C 58.57, H 9.00, N 4.97, S 5.89.
D. (3S,4S)-3-[(1'R)-1'-tert-Butyldimethylsilyloxyethyl]-4-[(1"R)-1"-carboxy-3 "-tert-butyldimethylsilyloxypropyl]azetidin-2-one ##STR64##
A cold (ice bath) solution of (3 S,4 S)-3-[(1'R)-1'- tert-butyldimethylsilyloxyethyl]-4-[(1"R)-1"-(pyridin-2-yl)methyl-thiocarb onyl-3"-tert-butyldimethylsilyloxypropyl]-azetidin-2-one (480 mg, 0.87 mmol) in THF (5 mL) was treated with 30% H2 O2 (0.15 mL, 1.7 mmol) followed by the dropwise addition of a 1N aqueous NaOH (1.7 mL, 1.7 mmol) solution. The ice bath was removed and the mixture was stirred for 90 min after which it was diluted with ethyl acetate (30 mL), washed with 1N aqueous HCl (25 mL), 1N aqueous NaHSO3 (25 mL), water and brine, and dried. Evaporation of the solvent afforded the title compound (0.37 g, 96%) as a white solid; m.p.=125°-127°C (ethyl acetate).
IR (CH2 Cl2) νmax : 3410 (NH), 1765 (β-lactam) and 1710 cm -1 (acid);
1 H NMR (CDCl3) δ: 6.23 (1H, bs, NH), 4.204 (1H, m, H-1'), 2.94 (1H, dd, J=2.0 Hz, J=5.9 Hz, H-4), 3.72 (2H, bt, J=5.7 Hz, CH2), 3.07 (1H, dd, J=1.7 Hz, J=4.1 Hz, H-3), 2.84-2.74 (1H, m, H-1"), 2.02-1.81 (1H, m, HC H), 1.78-1.69 (1H, m, HCH), 1.18 (3H, d, J=6.3 Hz, CH3), 0.889, 0.866 (18H, 2s, tert-butyl), and 0.065 ppm (12H, s, dimethyl);
Anal. Calcd. for C21 H42 NO5 Si2 : C 56.71, H 9.52, N 3.15. Found C 56.55, H 9.67, N 3.13.
E. (3S,4R) -3-[(1'R)-1'-tert-Butyldimethylsilyloxyethyl]-4-[(1"R)-1"(2-tert-butyldime thylsilyloxyethyl)-3"-allyloxycarbonyl-2"-oxopropyl]azetidin-2-one ##STR65##
A suspension of (3 S,4 S)-3-[(1'R)-1'- tert-butyldimethylsilyloxymethyl]-4-[(1" R)-1"-carboxy-3"-tert-butyldimethylsilyloxypropyl]azetidin-2-one (7.5 g, 17 mmol) in CH3 CN (75 mL) was treated with carbonyldiimidazole (2.92 g, 18.0 mmol) and stirred for 1 h at 22°C The mixture was then treated with anhydrous monoalkyl magnesium malonate (5.3 g, 17 mmol) and heated at 80°C (bath temperature) for 18 h. The solvent was partially evaporated. The concentrated solution was diluted with EtOAc (250 mL), washed with 1N aqueous HCl (100 mL), water (100 mL), saturated aqueous NaHCO3 (100 mL), water and brine (100 mL) and dried (MgSO4). The residue (15 g) was passed through a flash silica gel (300 g) column (1:3 EtOAcexane) to give the title compound (5.15 g, 57%) as a mixture of ketone and enol form.
IR (Nujol) νmax : 3150-3100 (OH), 1760, 1710, 1650 and 1620 cm-1 (C═O and enol);
1 H NMR (CDCl3, 200 MHz) δ: 6.03-5.80 (2H, 2 bs and m, NH and allyl), 5.38-5.23 (2H, m, allyl), 5.07 (0.5H, s, vinylic H of enol), 4.67-4.60 (2H, m, CH2), 4.24-4.12 (1H, m, H-1'), 3.90 (0.47H, dd, J=2.2 Hz, J=5.6 Hz, H-4), 3.83 (0.53H, dd, J=2.1 Hz, J=7.1 Hz, H-4), 3.75-3.48 (32H, m, C H2 OSi and CO CH2 CO), 3.10 (0.47H, m, H-1"), 2.94 (1H, m, H-3), 2.55-2.40 (0.45H, m, H-1"), 1.97-1.6 (2H, 2 m, CH2), 1.17 (1.3H, d, J=6.3 Hz, CH3), 1.11 (1.4H, d, J=6.3 Hz, CH3), 0.882, 0.878, 0.865 (18H, 3s, tert-butyl), 0.064, 0.056, 0.049 and 0.031 ppm (12H, 4s, dimethyl);
Anal. Calcd. for C26 H49 NO6 Si2 : C 59.16, H 9.36, N 2.65. Found: C 59.11, H 9.36, N 2.60.
F. (3S,4R)-3-[(1'R)-1'-tert-Butyldimethylsilyloxyethyl]-4-[(1"R)-1"-(2-tert-b utyldimethylsilyloxyethyl)-3"-diazo-3"-allyloxycarbonyl-2"-oxopropyl]azetid in-2-one ##STR66##
A solution of (3 S,4 R)-3-[(1' R)-1'-tert-butyldimethylsilyloxyethyl]-4-[(1" R)-1"-(2-tert-butyldimethyls ilyloxymethyl)-3"-allyloxycarbonyl-2"-oxopropyl]azetidine-2-one (0.60 g, 1.1 mmol) in CH3 CN (10 ml) was treated with p-toluenesulfonyl azide (240 mg, 1.2 mmol) and triethylamine (160 μl, 1.1 mmol) and stirred for 2 h at about 22°C The solvent was removed and the residue titurated with petroleum ether (20 mL) in order to precipitate p-toluenesulfonamide. The yellow oil (0.61 g) was passed through a silica gel (25 g, 10%-20% EtOAcexane) to give pure title compound (420 mg); m.p.=53°-55°C
IR (CH2 Cl2) νmax : 3400 (NH), 3140 (N2), 1765, 1715 and 1050 cm-1 (C═O);
1 H NMR (CDCl3, 200 MHz) δ: 6.02-5.8 (2H, bs and m, NH, allyl), 5.4-5.27 (2H, m, allyl), 4.72-4.68 (2H, m, CH2), 4.23-4.13 (2H, m, H-1' and H-1"), 3.87 (1H, dd, J=2.1 Hz, J-5.5 Hz, H-4), 3.67-3.52 (2H, m, CH2 O), 3.04 (1H, bt, J=4.0 Hz, H-3), 2.10-2.01 (1H, m, HC H), 1.66-1.57 (1H, m, HCH), 1.165 (3H, d, J=6.4 Hz, CH3), 0.862 and 0.849 (18H, 2s, tert-butyl), 0.058, 0.053, 0.0005 and 0.0061 ppm (12H, 4s, dimethyl);
Anal. Calcd. for C26 H47 N3 O6 Si2 : C 56.39, H 8.55, N 7.59. Found: C 56.44, H 8.80, N 7.50.
G. Allyl (4R,5R,6S)-6-[(1'R)-1'-tert-butyldimethylsilyloxyethyl]-4-(2"-tert-butyldi methylsilyloxyethyl)-3,7-dioxo-1-azabicyclo[3.2.0]heptane-2-carboxylate ##STR67##
A solution of (3 S,4 R)-3-[(1' R)-1'-tert-butyldimethylsilyloxyethyl]-4-[(1" R)-1"-(2-tert-butyldimethyls ilyloxyethyl)-3"-diazo-3"-allyloxycarbonyl-2"-oxopropyl]azetidin-2-one (1.0 g, 1.8 mmol), Rhodium (II) octanoate (3 mg) in 75% hexane-EtOAc (10 mL) was heated under reflux for 3 h and evaporated down to give the title compound as an oil, in quantitative yield (1 g, 100%).
IR (neat) νmax : 1765 (C═O) 1745 (shoulder C═O) and 1735 cm-1 (shoulder, C═O);
1 H NMR (CDCl3, 200 MHz) δ: 5.99-8.79 (1H, m, allyl), 5.39 (2H, m, allyl), 4.7-4.6 (2H, m, CH2), 4.63 (1H, s, H-2), 4.35-4.2 (1H, m, H-1'), 4.25 (1H, dd, J=2.4 Hz, J=8.4 Hz, H-5), 3.8-3.6 (2H, m, CH2 --O), 3.21 (1H, dd, J=2.4 Hz, J=5.8 Hz, H-6), 2.99-2.87 (1H, m, H-4), 2.0-1.58 (2H, m, CH2), 1.28 (3H, d, J=6.2 Hz, CH3), 0.886, 0.879 (18H, 2s, tert-butyl), 0.094, 0.087, 0.054 and 0.045 ppm (12H, 4s, dimethyl).
H. Allyl (4R,5S,6S)-6-[(1'R)-1'-(tert-butyldimethylsilyloxyethyl]-4(2"-tert-butyldi methylsilyloxyethyl)-3-[(pyridin-2-yl)methylthio]-7-oxo-1-azabicyclo[3.2.0] hept-2-ene-2-carboxylate ##STR68##
A cold (ice bath) solution of allyl (4 R-5 R-6 S)-6-[(1' R)-1'-tert-butyldimethylsilyloxyethyl]-4-(2"- tert-butyldimethylsilyloxyethyl)-3,7-dioxo-1-azabicyclo[3.2.0]heptane-2-ca rboxylate (0.92 g, 1.8 mmol) in CH3 CN (10 mL) was treated with diphenyl chlorophosphate (0.4 mL, 2 mmol), N,N-diisopropylethylamine (0.36 mL, 2 mmol), dimethylaminopyridine (1 mg) and stirred for 1 h at 22°C The mixture was cooled again (ice bath), treated with 2-picolyl mercaptan (0.38 g, 3 mmol) and N,N-diisopropylethylamine (0.6 μl, 3.2 mmol) and stirred for 20 h at 5°C The reaction mixture was diluted with EtOAc (60 mL), washed with cold NaHCO3, water (3×50 mL), brine and dried (MgSO4). The residue obtained upon solvent evaporation was passed through a silica gel column (16 g, 1:9→1.3 EtOAc:Hexane) to give the title compound (0.63 g, 56%).
IR (CH2 Cl2) νmax : 1775 and 1710 cm-1 (C═O);
1 H NMR (CDCl3, 200 MHz) δ: 8.52-8.49 (1H, m aromatic), 7.68-7.59 (1H, m, aromatic), 7.34-7.30 (1H, d, aromatic), 7.20-7.13 (1H, m, aromatic), 6.03-5.84 (1H, m, allylic H), 5.47-5.18 (1H, m, allylic H), 3.82-4.6 (2H, m, CH2), 4.354, 4.287 (1H, part of ABq, J=13.5 Hz, CH2 -pyridyl), 4.28-4.14 (1H, m, H-1'), 4.143, 4.075 (1H, part of ABq, J=13.5 Hz, CH2 -pyridyl) 4.08 (1H, dd, J=2.4 Hz, J=9.2 Hz, H-5), 3.84-3.70 (2H, m, CH2 O), 3.65-3.51 (1H, m, H-4), 3.100 (1H, dd, J=2.4 Hz, J=6.9 Hz, H-6), 2.12-1.69 (1H, m, HC H), 1.56-1.56 (1H, m, HCH), 1.284 (3H, d, J=6.1, CH3), 0.888, 0.850 (18H, 2s, tert-butyl), 0.081 (6H, s, dimethyl), 0.051 and 0.045 ppm (6H, 2s, dimethyl).
I. Allyl (4R,5S,6S)-6-[(1'R)-1'-hydroxyethyl]-4-(2"-hydroxyethyl)-3-[(pyridin-2yl)m ethylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate ##STR69##
A cold (ice-MeOH bath) solution of allyl (4 R,5 S,6 S)-6-[(1' R)-1'- tert-butyldimethylsilyloxyethyl]-4-(2"- tert-butyldimethylsilyloxyethyl)-3-[(pyridin-2-yl)methylthio]-7-oxo-1-azab icyclo[3.2.0]hept-2-ene-2-carboxylate (230 mg, 0.36 mmol) in THF (freshly distilled) (5 mL) was treated first with acetic acid (250 μl, 4.2 mmol) and dropwise with a 1M solution of tetrabutylammonium fluoride in THF (2.2 mL, 2.2 mmol). The mixture was stirred for 120 h at 22°C, diluted with EtOAc (20 mL), washed with cold 1M aqueous NaHCO3 (15 mL), water (15 mL), brine (15 mL) and dried (MgSO4). The residue upon solvent evaporation was purified on a silica gel (10 g) column (10% CH3 CNH2 Cl2, CH3 CN, acetone) to give the title compound (60 mg, 41%).
IR (CH2 Cl) νmax : 3690, 3610, 3530 (OH), 1775 and 1710 cm-1 (C═O);
1 H NMR (CDCl3, 200 MHz) δ: 8.5-8.47 (1H, m, aromatic H), 7.75-7.66 (1H, m, aromatic H), 7.42, 7.38 (1H, d, aromatic H), 7.23-7.19 (1H, aromatic H), 6.05-5.86 (1H, m, allylic H), 5.48-5.21 (2H, m, allylic H), 4.87-4.60 (2H, m, CH2), 4.343, 4.273 (1H part of ABq, J=14.1 Hz, CH2 -pyridyl), 4.204 (1H, dd, J=2.7 Hz, J=9.6 Hz, H-5), 4.142, 4.072 (1H, part of ABq, J=14.1 Hz, CH2 -pyridyl), 4.27-4.14 (1H, m, H-1'), 3.89-3.70 (3H, m, CH2 --O and H-4), 3.261 (1H, dd, J=2.7 Hz, J=7.8 Hz, H-6), 2.17-2.02 (1H, m, HC H), 1.89-1.67 (1H, m, HCH), 1.66 (2H, bs, OH) and 1.364 ppm (3H, d, J=6.3 Hz, CH3).
J. Sodium (4R,5S,6S)-6-[(1'R)-1'-hydroxyethyl]-4-(2"-hydroxyethyl)-3-[(pyridin-2-yl) methylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate ##STR70##
A cold (ice bath) solution of allyl (4 R,5 S,6 S)-6-[(1'R)-1'-hydroxyethyl]-4-(2"-hydroxyethyl)-3-[(pyridin-2-yl)methylth io]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate (60 mg, 0.15 mmol) in freshly distilled THF (2 mL) was treated with PPh3 (5 mg), (PPh3)4 Pd (5 mg) and N-methylaniline (33 μl, 0.3 mmol). The ice bath was removed and the mixture was stirred for 1 h, then diluted with EtOAc (8 mL) and extracted twice with 0.1M, pH7 aqueous buffer solution(4 mL+2 mL). The aqueous phases were combined, washed with EtOAc (5 mL), pumped under vacuum and passed through a reversed phase silica gel C18 column (10 g, H2 O -10% CH3 CN2 O) to give the title compound as a lyophilized powder (25 mg, 43%).
Purity by HPLC: 99.5% (10% CH3 CN/KH2 PO4 0.01M, pH 7.4, C18 μBondapak, r.t. 4.49 min).
IR (Nujol) νmax : 1750 and 1600 cm-1 (C═O);
UV: (H2 O) λmax 266 (5100), 306 (6800);
1 H NMR (D2 O, 200 MHz) δ: 8.48-8.45 (1H, m, aromatic H), 7.89-7.81 (1H m, aromatic H), 7.53-7.49 (1H, d, J=7.9 Hz, aromatic H), 7.39-7.33 (1H, m, aromatic H), 4.25-4.186, 4.103, 4.033 (2H, ABq, J=13.8, CH2 -pyridyl), 4.25-4.18 (1H, m, H-1'), 4.0587, 4.0457 (part of dd, J=2.6, H-5), 3.74-3.61 (1H, m, H--CH--O), 3.57-3.44 (1H, m, HC H--O), 3.383 (1H, dd, J=2.6 Hz, J=5.9 Hz, H-6), 3.31-3.19 (1H, m, H-4), 2.1-1.9 (1H, m, HCH), 1.69-1.5 (1H m, HC H), and 1.285 ppm (3H, d, J-6.4 Hz, CH3).
Sodium (4R,5S,6S)-4-(2"-azidoethyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(pyridin-2-yl)me thylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate ##STR71## A. Allyl (4R,5S,6S)-6-[(1'R)-1'-tert-butyldimethylsilyloxyethyl]-4-(2"-hydroxyethyl )-3-[(pyridin-2-y)methylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxy late ##STR72##
A cold (ice bath) solution of allyl (4 R,5 S,6 S)-6-[(1'R)-1'- tert-butyldimethylsilyloxyethyl]-4-(2"- tert-butyldimethylsilyloxyethyl)-3-[(pyridin-2-yl)methylthio]-7-oxo-1-azab icyclo[3.2.0]hept-2-ene-2-carboxylate (630 mg, 1.00 mmol) prepared as in Example 5 Step H in freshly distilled THF (10 mL) was treated first with AcOH (0.35 mL, 6 mmol) and then dropwise with a 1M THF solution of tetrabutylammonium fluoride (3.0 mL, 3 mmol). The mixture was stirred for 20 h at 5°C, neutralized to pH 7.0 with a 1M aqueous NaHCO3 solution and extracted with EtOAc (2×15 mL). The organic solution was washed with 1M aqueous NaHCO3 (1×20 mL), water (3×20 mL) brine and dried (MgSO4). The residue (0.6 g) was passed through a flash silica gel (20 g) column to give the title compound (1:1 hexane, EtOAc) as an oil (0.39 g, 75%).
IR (CH2 Cl2) νmax : 3680 3610 (OH) 1770 and 1710 cm-1 (C═O);
1 H NMR (CDCl3, 200 MHz) δ: 8.479 (1H, bd, J=4.1 Hz, aromatic H), 7.710 (1H, dt, J=7.7 Hz, J=1.78 Hz, aromatic H), 7.40 (1H, d, J=8.8 Hz, aromatic H), 7.26-7.19 (1H, m, aromatic H), 6.04-5.85 (1H, m, allylic-H), 5.48-5.20 (2H, m, allylic H), 4.83-4.61 (2H, m, CH2), 4.387, 4.317, 4.178, 4.109 (2H, ABq, J=14.0 Hz, CH2 -pyridine), 4.27-4.12 (1H, m, H-1'), 4.122, 4.075, 4.063 (1H, dd, J=2.4 Hz, J=9.4 Hz, H-5), 3.93-3.82 (2H, m, H-4 and HC H--O), 3.65-3.55 (2H, m, H--CH--O and OH), 3.130 (1H, dd, J=2.4 Hz, J=7.0 Hz, H-6), 2.2-2.0 (1H, m, HC H), 1.9-1.6 (1H, m, HCH), 1.279 (3H, t, J=7.1 Hz, CH3), 0.889 (9H, s, tert-butyl) and 0.076 ppm (6H, s, dimethyl).
B. Allyl (4R,5S,6S)-4-(2"-azidoethyl)-6-[(1'R)-1'-tert-butyldimethylsilyloxyethyl]- 3-[(pyridin-2-yl)methylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxyl ate ##STR73##
A cold (-20°C) solution of allyl (4 R,5 S,6 S)-6-[(1'R)-1'- tert-butyldimethylsilyloxyethyl]-4-(2"-hydroxyethyl)-3-[(pyridin-2-yl)meth ylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate (0.39 g, 0.75 mmol) in THF (80 mL) was treated with triphenylphosphine (315 mg, 1.2 mmol), a 0.43M solution of hydrazoic acid in toluene (0.21 mL, 1.3 mmol) and diethyl azodicarboxylate (0.21 mL, 1.3 mmol). The mixture was stirred for 30 min at -20°C, diluted with EtOAc (30 mL), washed with 1M aqueous NaHCO3, (1×20 mL), water (2×20 mL), brine and dried (MgSO4). The residue (about 1 g) was passed through a silica gel (50 g) column (1:AcOEt/hexane) to give the title compound (0.30 g, 74%).
IR (CH2 Cl2) νmax : 2105 (N3), 1775 and 1710 cm-1 (C═O);
1 H NMR (CDCl3, 200 MHz) δ: 8.53-8.50 (1H, m, aromatic H), 7.71-7.62 (1H, m, aromatic H), 7.38, 7.34 (1H, d, aromatic H), 7.22-7.16 (1H, m, aromatic H), 6.03-5.84 (1H, m, allylic H), 5.46-5.20 (2H, m, allylic H), 4.83-4.59 (2H, m, CH2), 4.306, 4.237, 4.096, 4.628 (2H, ABq, J=13.7 Hz, CH2 pyridyl), 4.23-4.1 (1H, m, H-1'), 4.076, 4.063, 4.016 (1H, dd, J=2.6 Hz, J=9.4 Hz, H-5), 3.75-3.6 (1H, m, H-4), 3.6-3.45 (1H, m, HC H--O), 3.45-3.25 (1H, m, HCH--O), 3.071 (1H, dd, J=2.6 Hz, J=7.8 Hz, H-6), 2.13-1.95 (1H, m, HCH), 1.8-1.5 (1H, m, HCH), 1.302 (3H, d, J=6.0 Hz, CH3), 0.892 (9H, s, tert-butyl), 0.086 and 0.081 ppm (6H, 2s, dimethyl).
C. Allyl (4R,5S,6S)-4-(2"-azidoethyl)-6-[(1'R)-1'-hydroxyethyl]-3-[pyridin-2-yl)met hylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate ##STR74##
A cold (-20°C) solution of allyl (4 R,5 S,6 S)-4-(2"-azidoethyl)-6-[(1' R)-1'- tert-butyldimethylsilyloxyethyl]-3-[(pyridin-2-yl)methylthio]-7-oxo-1-azab icyclo[3.2.0]hept-2-ene-2-carboxylate (0.30 g, 0.55 mmol) in freshly distilled THF (10 mL) was treated with AcOH (0.2 mL, 3.3 mmol) and dropwise with a 1M THF solution of tetrabutylammonium fluoride (1.7 mL, 1.7 mmol). The mixture was then stirred at 5°C for 90 h, diluted with EtOAc (40 mL), washed with 1M aqueous NaHCO3 (1×30 mL), water (2×30 mL), brine and dried (MgSO4). The residue 0.3 g was passed through a silica gel (10 g) column (1:1 hexane:EtOAc) to give the title compound (0.21 g, 89%).
IR (CH2 Cl2) νmax : 3680-3600 (OH), 2100 (N3) 1775 and 1710 cm-1 (C═O);
1 H NMR (CDCl3, 200 MHz) δ: 8.54-8.51 (1H, m, aromatic H), 7.7-7.6 (1H, m, aromatic H), 7.38, 7.34 (1H, m, aromatic H), 7.25-7.15 (1H, m, aromatic H), 6.1-5.8 (1H, m, allyl H), 5.5 (2H, m, allyl H), 4.8-4.55 (2H, m, CH2 -allyl), 4.294, 4.225, 4.072, 4.002 (2H, ABq, J=14.0 Hz, CH2 -pyridyl), 4.3-4.1 (1H, m, H-1'), 4.166 (1H, dd, J=2.7 Hz, J=9.5 Hz, H-5), 3.8-3.65 (1H, m, H-4), 3.6-3.3 (2H, m, CH2 --N3), 3.162 (1H, dd, J=2.7 Hz, J=7.7 Hz, H-6), 2.2-2 (1H, m, HCH), 1.95 (1H, bs, OH), 1.9-1.6 (1H, m, HC H) 1.382 (3H, d, J=6.2 Hz, CH3).
D. Sodium (4R,5S,6S)-4-(2"-azidoethyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(pyridin-2-yl)me thylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate ##STR75##
A cold (ice bath) solution of allyl (4 R,5 S,6 S)-4-(2-azidoethyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(pyridin-2-yl)]-7-oxo-1-a zabicyclo[3.2.0]hept-2-ene-2-carboxylate (74 mg, 0.17 mmol) in CH2 Cl2 (3 mL) was treated with Pd(PPh3)4 (35 mg) followed by the addition of N-methylaniline (0.5 mL, 0.45 mmol). The resulting mixture was stirred at about 22°C for 1 h, then diluted with a 0.1M pH 7.1 aqueous phosphate buffer solution (0.35 mmol) and diethyl ether (10 mL). The phases were separated and the aqueous phase was washed with diethyl ether (2×10 mL), pumped under high vacuum, and passed through a C18 microBondapak reversed phase column (35 g, 4%→10% CH3 CN2 O) to give the title compound (55 mg, 41%) after lyophilization.
UV: (H2 O) λmax : 266 (7800), 304 (10500);
Purity by HPLC: 99.5% (304 nm, 10% CH3 CN/KH2 PO4 0.01M pH 7.4).
IR (Nujol) νmax : 2100 (N3), 1750 and 1600 cm-1 (C═O);
1 H NMR (D2 O, 200 MHz) δ: 8.5-8.4 (1H, m, aromatic H), 7.9-7.8 (1H, m, aromatic H), 7.54, 7.50 (1H, dd, aromatic H), 7.4-7.3 (1H, m, aromatic H), 4.27, 4.20, 4.11, 4.04 (2H, ABq, J=14.2 Hz, CH2 -pyridine), 4.25-4.15 (1H, m, H-1'), 4.067, 4,054 (part of dd, J=2.6 Hz, part of H-5), 3.52-3.17 (4H, m, CH2 N3, H-4 and H-6), 3.389 (1H, dd, J=2.7 Hz, J=6.3 Hz, H-6), 2.1-1.9 (1H, m, HCH), 1.75-1.5 (1H, m, HCH) and 1.297 ppm (3H, d, J=6.4 Hz, CH3).
(4R,5S,6S)-4-(3"-Aminopropyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(pyridin-2-yl)me thylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR76## A. 5-Azido-[(pyridin-2-yl)methylthio]-valerate ##STR77##
A cold (ice bath) solution of 2-picolyl mercaptan (20.2 g, 162 mmol) in CH2 Cl2 (200 mL) was treated with pyridine (16.3 mL, 203 mmol) followed by dropwise addition of 5-azidovaleryl chloride (27.0 g, 167 mmol) in CH2 Cl2 (50 mL). The mixture was stirred for 30 min, diluted with diethyl ether (1 L), washed with cold water (500 mL), 1M aqueous NaHSO3 (2×500 mL), water (500 mL), 1M aqueous NaHCO3 (500 mL), water (500 mL), brine (500 mL) and dried (MgSO4). Evaporation of the solvent afforded the title compound (40.8 g, 100%).
1 H NMR (CDCl3, 200 MHz) δ: 8.54, 8.52 (1H, bd, aromatic H), 7.6-7.5 (1H, m, aromatic H), 7.35-7.31 (1H, bd, aromatic H), 7.19-7.12 (1H, m, aromatic H), 4.25 (2H, s, CH2), 3.27 (2H, t, J=6.6 Hz, CH2 N3), 2.62 (2H, t, J=6.9 Hz, CH2 CO), and 1.8-1.5 ppm (4H, m, CH2 CH2).
B. tert-Butyldimethylsilylenol ether of 5-azido-[(pyridin-2-yl)methylthio]valerate ##STR78##
A cold (ice-MeOH bath) solution of 5-azido-[(pyridin-2-yl)methylthio]valerate (44.0 g, 162 mmol) in CH2 Cl2 (400 mL) was successively treated with triethylamine (50 mL, 356 mmol) and dropwise with tert-butyldimethylsilyl trifluoromethanesulfonate (76.6 mL, 333 mmol). The cold bath was removed and the mixture was stirred for 2 h. The reaction mixture was then diluted with petroleum ether (1.5 L), washed with cold water (2×500 mL), 1M aqueous NaHCO3 (2×500 mL), water (2×500 mL), brine (500 mL) and dried (MgSO4). The organic phase was then treated with neutral activated charcoal to give, after filtration and evaporation of solvent, title compound (48.9 g, 83%).
1 H NMR (CDCl3, 200 MHz) δ: 8.56-8.53 (1H, m, aromatic H), 7.67-7.57 (1H, m, aromatic H), 7.28-7.23 (1H, m, aromatic H), 7.18-7.11 (1H, m, aromatic H), 4.96 (0.5H, t, J=7.6 Hz, vinylic H), 4.80 (0.5H, t, J=7.3 Hz, vinylic H), 4.030 and 3.955 (2H, 2s, CH2 -pyridyl), 3.097 and 3.040 (2H, 2t, J=7.0 Hz, J=7.3 Hz, CH2), 2.06 (2H, center of 4 lines, J=7.1 Hz, CH2 vinyl), 1.57-1.38 (2H, m, CH2), 0.989, 0.970 (9H, 2s, tert-butyl) and 0.243, 0.205 ppm (6H, 2s, dimethyl).
C. (3S,4S)-3-[(1'R)-1'-tert-Butyldimethylsilyloxyethyl]-4-[(1"R)-1"-(pyridin- 2-yl)methylthiocarbonyl-4"-azidobutyl]azetidin-2-one ##STR79##
To a cold (ice bath) freshly fused ZnCl2 (18.0 g, 133 mmol) was added successively (3 S,4 R)-4-acetoxy-3-[(1' R)-1'- tert-butyldimethylsilyloxyethyl]azetidin-2-one (19.0 g, 67.0 mmol) in CH2 Cl2 (200 mL) and dropwise a solution of tert-butyldimethylsilylenol ether of 5-azido-[(pyridin-2-yl)methylthio]-valerate (48.5 g, 133 mmol) prepared in Step B in CH2 Cl2 (100 mL). The mixture was stirred for 1 h and left overnight (18 h) at 5°C (cold room). The reaction mixture was diluted with petroleum ether (1.2 L) and ice cold water (500 mL). The organic phase was washed with cold water (2×500 mL), 1M aqueous (NH4 Cl) (1×500 mL) water (500 mL), 1M aqueous NaHCO3 (2×500 mL), water (2×500 mL), brine and dried (MgSO4). The residue was passed through a silica gel pad (400 g, hexane, CH2 Cl2, EtOAc) to give the title compound (14.2 g, 44%) as an oil.
IR (CH2 Cl2) νmax : 3400 (NH), 2100 (N3), 1770 and 1680 cm-1 (C═O),
1 H NMR (CDCl3, 200 MHz) δ: 8.55-8.51 (1H, m, aromatic H), 7.68-7.59 (1H, m, aromatic H), 7.35-7.30 (1H, m, aromatic H), 7.21-7.14 (1H, m, aromatic H), 5.89 (1H, bs, NH), 4.27 (2H, s, CH2 -pyridyl), 4.20-4.10 (1H, m, H-1'), 3.81 (1H, dd, J=2.1 Hz, J=7.0 Hz, H-4), 3.279 (2H, bt, J=6.3 Hz, CH2 N3), 3.048 (1H, dd, J=2.4 Hz, J=3.2 Hz, H-3), 2.9-1.7 (1H, m, H-1"), 1.9-1.7 (1H, m, HCH), 1.7-1.5 (3H, m, HC H and CH2), 0.987 (3H, d, J=6.3 Hz, CH3), 0.851 (9H, s, tert-butyl) and 0.042 ppm (6H, s, dimethyl).
D. (3S,4S)-3-[(1'R)-1'-tert-Butyldimethylsilyloxyethyl]-4-[(1"R)-1"-carboxy-4 "-azidobutyl]azetidin-2-one ##STR80##
A cold (ice bath) solution of (3 S,4 S)-3-[(1' R)-1'- tert-butyldimethylsilyloxyethyl]-4-[(1" R)-1"-(pyridin-2-yl)-methylthiocarbonyl-4"-azidobutyl]azetidin-2-one (14.0 g, 28.4 mmol) in THF (140 mL) was treated first with 30% H2 O2 (9.8 mL, 714 mmol) followed by the dropwise addition of 1M aqueous NaOH (85.2 mL, 85.2 mmol). The ice bath was removed and the mixture was stirred for 0.5 h. after which it was acidified with 1N aqueous HCl (170 mL, 170 mmol) and extracted with EtOAc (3×125 mL). The ethyl acetate extracts were combined, washed with water (1×125 mL), 1M aqueous NaHSO3 (1×125 mL), water (2×125 mL), brine (1×125 mL) and dried (MgSO4). Evaporation of the solvent and trituration of the solid (hexane) afforded the title compound (8.3 g, 76%) as a white solid; m.p.=147°-148°C (diethyl ether).
IR (CH2 Cl2) νmax : 3410 (NH) 2100 (N3) 1765, 1740 and 1710 cm-1 (C═O);
1 H NMR (CDCl3, 200 MHz) δ: 6.43 (1H, bs, NH), 4.3-4.1 (1H, m, H-1'), 3.89 (1H, dd, J=2.0 Hz, J=6.1 Hz, H-4), 3.337 (2H, bt, J=6.1 Hz, CH2 N3), 3.148 (1H, dd, J=2.0 Hz, J=3.7 Hz, H-3), 2.75-2.6 (1H, m, H-1"), 1.9-1.5 (4H, m, CH2 CH2), 1.176 (3H, d, J=6.3 Hz, CH3), 0.868 (9H, s, tert-butyl), 0.071 and 0.060 ppm (6H, 2s, dimethyl).
E. (3S,4R)-3-[(1'R)-1'-tert-Butyldimethylsilyloxyethyl]-4-[(1"R)-1"-(3-azidop ropyl)-3"-diazo-3"-allyloxycarbonyl-2"-oxopropyl]azetidin-2-one ##STR81##
A suspension of (3 S,4 R)-3-[(1' R)-1'- tert-butyldimethylsilyloxyethyl]-4-[(1" R)-1"-carboxy-4"-azidobutyl]azetidin-2-one (5.0 g, 13 mmol) in CH3 CN (50 mL) was treated with carbonyldiimidazole (2.5 g, 15.6 mmol) and stirred for 30 min. To the resulting clear solution (acyl imidazole) was added magnesium monoallyl malonate (5.0 g, 16 mmol). The mixture was heated at 70°C (bath temperature) for 18 h. More malonate (1.25 g, 4 mmol) was added and the mixture was heated for 5 more hours. Then magnesium monoallyl malonate (1.25 g, 4 mmol) was added in again and heating was continued for 18 h. The solvent was partially evaporated. The residue was taken up in ethyl acetate (100 mL), washed with water 100 mL, 1N aqueous HCl (100 mL), water (2×100 mL), 10% aqueous K2 CO3 (100 mL), water (100 mL), brine (100 mL) and dried (MgSO4). The residue after solvent evaporation was taken up in CH3 CN (50 mL), cooled to 5°C (ice bath) under nitrogen, treated successively with triethylamine (1.82 mL, 13.0 mmol) and dropwise with p-toluenesulfonyl azide (2.56 mL, 13.0 mmol) in CH3 CN (5 mL) and stirred for 3 h at room temperature (22°C). The solvent was evaporated and the residue obtained was passed through a silica gel pad (100 g, hexane→40% etherexane) to give the title compound (1.6 g, 25%) as a yellow oil.
IR (CH2 Cl2) νmax : 3400 (NH), 2150 (N2), 2100 (N3), 1765, 1715 and 1650 cm-1 (C═O);
1 H NMR (CDCl3, 200 MHz) δ: 6.1-5.8 (1H, m, vinylic H), 5.85 (1H, bs, NH), 5.41-5.29 (2H, m, vinylic H), 4.74-4.70 (2H, m, allylic CH2), 4.3-4.0 (2H, m, H-1' and H-1"), 3.85 (1H, dd, J=2.1 Hz, J=5.3 Hz, H-4), 3.267 (2H, m, CH2 N3), 3.044 (1H, dd, J=2.1 Hz, J=3.6 Hz, H-3), 2.0-1.8 (1H, m, HC H), 1.7-1.4 (3H, m, CH2 HCH), 1.172 (3H, d, J=6.3 Hz, CH3), 0.863 (9H, s, tert-butyl) 0.063 and 0.052 (6H, 2s, dimethyl).
F. Allyl (4R,5R,6S)-6-[(1'R)-1'-tert-butyldimethylsilyloxyethyl]-4-(3"-azidopropyl) -3,7-dioxo-1-azabicyclo[3.2.0]heptane-2-carboxylate ##STR82##
A solution of (3 S,4 R)-3-[(1' R)-1'- tert-butyldimethylsilyloxyethyl)-4-[(1" R)-1"-(3-azidopropyl)-3"-diazo-3"-allyloxycarbonyl-2"-oxopropyl]azetidin-2 -one (1.45 g, 303 mmol) in benzene (50 mL) previously purged with Argon (10 min) was heated under reflux for 40 min using Rh(OAc)2 (40 mg) as catalyst. The solvent was then evaporated to give title compound (1.45 g, 100%) as an oil.
IR (CH2 Cl2) δ: 2100 (N3) 1770 and 1745 cm-1 (C═O);
1 H NMR (CDCl3, 200 MHz) δ: 6.0-5.8 (1H, m, vinylic H), 5.4-5.25 (2H, m, vinylic H), 4.67 (1H, s, H-2), 4.64 (2H, m, CH2), 4.4-4.2 (1H, m, H-1'), 4.255, 1H, dd, J=2.4 Hz, J=8.3 Hz, H-5), 3.5-3.2 (2H, m, CH2 N3), 3.24 (1H, dd, J=2.4 Hz, J=6.2 Hz, H-6), 2.8-2.6 (1H, m, H-4), 1.85-1.55 (4H, m, CH2 CH2 CO), 1.304 (3H, d, J=6.2 Hz, CH3), 0.886 (9H, s, tert-butyl), 0.102 and 0.090 ppm (6H, 2s, dimethyl).
G. Allyl (4R,5S,6S)-4-(3"-azidopropyl)-6-[(1'R)-1'-(tert-butyl-dimethylsilyloxyethy l)]-3-[(pyridin-2-yl)methylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carb oxylate ##STR83##
A cold (ice-MeOH bath) solution of allyl (4 R,5 R,6 S)-4-(3"-azidopropyl)-6-[(1' R)-1'-tert-butyldimethylsilyloxyethyl]-3,7-dioxo-1-azabicyclo[3.2.0]heptan e-2-carboxylate (1.45 g, 3.03 mmol) in CH3 CN (25 mL) was treated with diphenyl chlorophosphate (0.67 mL, 3.3 mmol) and dropwise with N,N-diisopropylethylamine (0.55 mL, 3.3 mmol) and stirred for 45 min. The resulting enol phosphate was then treated with 2-picolyl mercaptan (2.90 g, 23.2 mmol) and dropwise with N,N-diisopropylethylamine (3.86 mL, 23.2 mmol). The ice-MeOH bath was replaced with an ice bath and the mixture was stirred for 2 h after which it was diluted with EtOAc (100 mL), washed with cold water (50 mL), cold 1M aqueous NaHSO3 (3×50 mL), water (2×50 mL), cold 1M aqueous NaHCO3 (2×50 mL), water (1×50 mL), brine (50 mL) and dried (MgSO4). The residue was passed through a silica gel column (30 g, hexane→40% EtOAcexane) to give the title product contaminated with the starting thiol. This material was diluted with diethyl ether (50 mL) and washed again with cold water (20 mL), 1M aqueous NaHSO3 (3×20 mL), H2 O (2×20 mL), 1M aqueous NaHCO3 (2×20 mL), water (20 mL), brine (20 mL) and dried (MgSO4) to give pure title compound (1.45 g, 86%).
IR (CH2 Cl2) νmax : 2105 (N3), 1775 and 1710 cm-1 (C═O);
1 H NMR (CDCl3, 200 MHz) δ: 8.5-8.4 (1H, m, aromatic H), 7.8-7.6 (1H, m, aromatic H), 7.4-7.39 (1H, bd, aromatic H), 7.3-7.18 (1H, m, aromatic H), 6.05-5.80 (1H, m, vinylic H), H-1'), 4.01 (1H, dd, J=2.6 Hz, J=9.5 Hz, H-5), 3.6-3.4 (1H, m, 5.5.-5.2 (2H, m, vinylic H), 4.9-4.6 (2H, m, CH2), 4.287, 4.217, 4.083, 4.013 (2H, ABq, J=14.0 Hz, CH2 -pyridyl), 4.21-4.08 (1H, m, H-4), 3.4-3.2 (2H, m, CH2 N3), 3.145 (1H, dd, J=2.6 Hz, J=7.5 Hz, H-6), 2.0-1.4 (4H, m, CH2 CH2), 1.288 (3H, d, J=6.1 Hz, CH3), 0.874 (9H, s, tert-butyl), 0.073 and 0.059 (6H, 2s, dimethyl).
H. Allyl (4R,5S,6S)-4-(3"-azidopropyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(pyridin-2-yl)m ethylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate ##STR84##
A cold (ice-MeOH bath) THF (30 mL) solution of allyl (4 R,5 S,6 S)-4-(3"-azidopropyl)-6-[(1' R)-1'- tert-butyldimethyl-silyloxyethyl]-3-[(pyridin-2-yl)methylthio]-7-oxo-1-aza bicyclo[3.2.0]hept-2-ene-2-carboxylate (1.5 g, 2.6 mmol) was treated dropwise with CH3 CO2 H (0.9 mL, 15.6 mmol) and with a 1M THF solution of tetrabutylammonium fluoride (7.8 mL, 7.8 mmol). The mixture was stirred at that temperature for 1 h, allowed to stand for 56 h at 5°C and then stirred at room temperature for 24 h. The mixture was cooled down to 0°C, neutralized with 1M aqueous NaHCO3 (16 mL) and the aqueous phase extracted with EtOAciethyl ether (1:1) (2×100 mL). The organic extracts were combined, washed with cold 1M aqueous NaHCO3 (50 mL), water (2×50 mL) brine and dried (MgSO4). The residue was passed through a silica gel column (30 g, hexane/CH2 Cl2 →CH2 Cl2 EtOAc→EtOAc) to give the title compound (679 mg, 64%) and starting material (160 mg, 11%).
IR (CH2 Cl2) νmax : 3600, 3500 (OH), 2100 (N3), 1775 and 1710 cm-1 (C═O);
1 H NMR (CDCl3, 200 MHz) δ: 8.51-8.49 (1H, m, aromatic H), 7.7-7.6 (1H, m, aromatic H), 7.41, 7.37 (1H, bd, aromatic H), 7.23-7.16 (1H, m, aromatic H), 6.05-5.8 (1H, m, vinylic H), 5.5-5.2 (2H, m, vinylic H), 4.86-4.6 (2H, m, vinylic CH2), 4.256, 4.185, 4.056, 3.985 (2H, ABq, J=14.2 Hz, CH2 -pyridyl), 4.25-4.15 (1H, m, H-1'), 1.121 (1H, dd, J=2.7 Hz, J=9.5 Hz, H-5), 3.6-3.45 (1H, hidden, H-4), 3.45-3.24 (2H, m, CH2 N3), 3.214 (1H, dd, J=2.7 Hz, J=7.5 Hz, H-6), 1.87 (1H, bd, J=6.5, OH), 2.0-1.5 (4H, m, CH2 CH2), and 1.37 ppm (3H, d, J=6.3 Hz, CH3).
I. (4R,5S,6S)-4-(3"-Aminopropyl)-6-[(1'R)-1'-hydroxyethyl]-3-[pyridin-2-yl)me thylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR85##
A cold (ice bath) solution of allyl (4 R,5 S,6 S)-4-(3"-azidopropyl)-6-[(1' R)-1'-hydroxyethyl]-3-[(pyridin-2-yl)methylthio]-7-oxo-1-azabicyclo[3.2.0] hept-2-ene-2-carboxylate (133 mg, 0.3 mmol) in CH2 Cl2 (10 mL) was treated with (Ph3 P)4 Pd (63 mg) and N-methyl aniline (0.1 mL, 0.6 mmol). The ice bath was removed and the mixture was stirred for 1 h after which it was cooled again (ice bath). The reaction mixture was diluted with diethyl ether (40 mL) and extracted with a 0.05M pH 7.0 phosphate buffer (2×6 mL). The aqueous extracts were combined, washed with diethyl ether (2×20 mL) and acidified to pH 5.8-5.9 with a 0.05M, pH 4.2 phosphate buffer. The aqueous layer was hydrogenolyzed at 50 psi for 1 h at 5°C→15°C using 10% Pd (225 mg) as catalyst. At the end of hydrogenolysis the catalyst was removed, passed on a C18 μBondapak column (35 g, H2 O→4% CH3 CN/H2 O) and lyophilized to give the title compound which was repurified again on a C18 μBondapak column (15 g) and lyophilized (17 mg, 11%).
Purity: 97.5% determined by HPLC (10% CH3 CN/KH2 PO4 0.01M, pH 7.4, r.t. 5.66 min, μBondapak C18 10μ);
UV (H2 O) λmax : 304 (9383), 266 (6895);
IR (Nujol) λmax : 1755 and 1590 cm-1 (C═O);
1 H NMR (D2 O, 200 MHz) δ: 8.48-8.45 (1H, bd, aromatic H), 7.9-7.8 (1H, m, aromatic H), 7.54, 7.49 (1H, bd, aromatic H), 7.4-7.3 (1H, m, aromatic H), 4.3-4.1 (1H, m, H-1'), 4.225, 4.157, 4.106, 4.043 (2H, ABq, J=13.2 Hz, CH2 -pyridine), 4.056, 4.043 (part of dd, J=2.6 Hz, H-5), 3.31 (1H, dd, J=2.6 Hz, J=6.5 Hz, H-6), 3.197 (1H, bt, J=9.4 Hz, H-4), 3.0-2.85 (2H, m, CH2 N3), 1.9-1.55 (3H, m, HC H and CH2), 1.55-1.2 (1H, m, HC H) and 1.295 ppm (3H, d, J=6.4 Hz, CH3).
(4R,5S,6S)-4-[3"-(N-Formimidoyl)aminopropyl]-6-[(1'R)-1'-hydroxyethyl]-3-[( pyridin-2-yl)methylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR86##
The pH of the crude hydrogenolyzed product (4 R,5 S,6 S)-4-(3"-aminopropyl)-6-[(1' R)-1'-hydroxyethyl]-3-[(pyridin-2-yl)-methylthio]-7-oxo-1-azabicyclo[3.2.0 ]hept-2-ene-2-carboxylic acid obtained from the deprotection of allyl (4 R,5 S,6 S)-4-(3"-azidopropyl)-6-[(1' R)-1-hydroxyethyl]-3-[(pyridin-2-yl)methylthio]-7-oxo-1-azabicyclo[3.2.0]h ept-2-ene-2-carboxylate (150 mg, 0.338 mmol) as described in Example 7 Step I was adjusted to 8.5 with 1M aqueous NaOH at 5°C (ice bath). To the aqueous mixture was added portionwise benzyl formimidate hydrochloride (583 mg, 3.41 mmol) while maintaining the pH at 8.3-8.4 with 1M aqueous NaOH. At the end of the addition, the mixture was stirred for 6 min and then applied on a μBondapak C18 reversed phase column (40 g, H2 O→1,2,3,4 and 6% CH3 CN2 O) to give the title product which was repurified on a μBondapak C18 reversed phase column (H2 O→2,3,4, and 6% CH3 CN/H2 O). Pure title compound (19 mg, 11%) was obtained as a white fluffy solid.
Purity: 98.9% as determined by HPLC(10% CH3 CN/K2 PO4 0.01M, pH 7.4, r.t. 6.77 min, μBondapak C18 10μ);
UV (H2 O) λmax : 304 (7791), 266 (5941);
IR (Nujol) νmax : 1755, 1690 (C═O), and 1715 cm-1 (C═NH);
1 H NMR (D2 O, 200 MHz) δ: 8.45-8.42 (1H, bd, aromatic H), 7.87-7.75 (1H, m, aromatic H), 7.77 (1H, bs, C═NH), 7.51, 7.47 (1H, bd, aromatic H), 7.37, 7.3 (1H, m, aromatic H), 4.3-4.1 (1H, m, H-1'), 4.198, 4.134, 4.072, 4.001 (2H, ABq, J=13.5 Hz, CH2 pyridine), 4.045-4.07 (1H, hidden H-5), 3.4-3.05 (4H, m, CH2 N, H-4, H-6), 1.8-1.4 (3H, m, HC H and CH2), 1.4-1.15 (1H, m, HCH) and 1.259 ppm (3H, d, J=6.3 Hz, CH3).
Sodium (4R,5S,6S)-6-[(1'R)-1'-hydroxyethyl]-4-(3"-hydroxypropyl)-3-[(pyridin-2-yl )methylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate ##STR87## A. Sodium 5-hydroxyvalerate ##STR88##
A cold (ice bath) suspension of valerolactone (20 g, 0.20 mol) in water (100 mL) was treated dropwise with a solution of NaOH (8.0 g, 0.20 mol) in water (100 mL). The mixture was stirred for 15 min after which the cold bath was removed and stirring was continued for 15 more min. The mixture was then filtered to remove the solid and lyophilization of the filtrate gave the title compound (26.2 g, 94%) as a white solid.
IR (Nujol) νmax : 3600-3100 (OH) and 1560 cm-1 (C═O);
1 H NMR (D2 O, 200 MHz) δ: 3.61 (2H, t, J=6.1 Hz, CH2 OH), 2.20 (2H, t, J=7.0 Hz, CH2 CO2) and 1.58, 1.57, 1.55 ppm (4H, m, CH2 CH2).
B. t-Butyldimethylsilyl 5-(t-butyldimethylsilyloxy)valerate ##STR89##
To a cold (ice bath) suspension of sodium 5-hydroxyvalerate (25.0 g, 179 mmol) in DMF (250 mL) was added portionwise t-butyldimethylsilyl chloride (80.8 g, 536 mmol) followed by the dropwise addition of triethylamine (32 mL, 232 mmol). The ice bath was removed and the mixture was stirred for 2.5 days at about 22°C, The reaction mixture was diluted with ice cold water (700 mL) and extracted with diethyl ether (2×800 mL). The organic extracts were combined, washed with cold water (5×500 mL), brine (500 mL) and dried (MgSO4). Evaporation of the solvent gave the title compound (70 g, >100%) as an oil.
IR (neat) νmax : 1720 cm-1 (C═O);
1 H NMR (CDCl3, 200 MHz) δ: 3.61 (2H, t, J=6.0 Hz, CH2 O), 2.33 (2H, t, J=7.0 Hz, CH2 CO2), 2.8-2.5 (4H, m, (CH2)2), 0.92, 0.88 (18H, 2s, t-butyl), 0.25, 0.09, and 0.04 ppm (12H, 3s, CH3).
C. 5-(t-Butyldimethylsilyloxy)valeric acid ##STR90##
A solution of t-butyldimethylsilyl 5-(t-butyldimethylsilyloxy)valerate (70 g, from 178.6 mmol of sodium hydroxyvalerate) in MeOH (550 mL) was treated with a 5N solution of AcOH in water (50 mL, 250 mmol) and then stirred for 1.5-2.0 h. The solvent was removed and the residue was taken up in CH2 Cl2 (1 L) and washed with ice cold water (4×500 mL), brine (500 mL) and dried (MgSO4). The residue (58 g) upon solvent evaporation was taken up in diethyl ether (600 mL) and extracted with 1M aqueous NaHCO3 (3×200 mL). The aqueous extracts were combined, washed with diethyl ether (3×200 mL), acidified with 5M aqueous AcOH to pH 5.0 and then extracted with diethyl ether (4×200 mL). The organic extracts were combined, washed with cold water (4×200 mL), brine (200 mL) and dried (MgSO4) to give the title compound (25 g, 60%) as an oil.
IR (CH2 Cl2) νmax : 3660-2500 (OH), 1750-1710 cm-1 (C═O);
1 H NMR (CDCl3, 200 MHz) δ: 3.63 (2H, t, J=6.0 Hz, CH2 O), 2.39 (2H, t, J=7.2 Hz, CH2 CO2), 1.78-1.49 (4H, m, (CH2)2), 0.89 (9H, s, t-butyl) and 0847 ppm (6H, s, CH3).
D. 5-(tert-Butyldimethylsilyloxy)-1-[(pyridin-2-yl)methylthio]valerate ##STR91##
To a cold (ice bath) solution of 5-(t-butyldimethylsilyloxy)valeric acid (25.0 g, 108 mmol) in CH2 Cl2 (350 mL) was added 2-picolyl mercaptan (13.5 g, 108 mmol), 1,3-dicyclohexyl carbodiimide (22.2 g, 108 mmol) and 1-hydroxybenzotriazole hydrate (14.6 g, 108 mmol). The ice bath was removed and the mixture was stirred for 20 h, then diluted with ethyl acetate (1 L), washed with ice cold water (1 L), ice cold 1M aqueous NaHSO3 (1 L), ice cold water (1 L), 1M aqueous NaHCO3 (1 L), ice cold water (2×1 L), brine (1 L) and dried (MgSO4). The residue upon solvent evaporation was purified on a silica gel flash column (250 g, hexane, 5%, 10%, 15% EtOAcexane) to give the title compound (30.2 g, 83%) as an oil.
IR (CH2 Cl2) νmax : 1690 cm-1 (C═O);
1 H NMR (CDCl3, 200 MHz) δ: 8.55-8.52 (1H, m, pyridine-H), 7.68-7.59 (1H, m, pyridine-H), 7.37-7.33 (1H, bd, J=7.7 Hz, pyridine-H), 7.20-7.14 (1H, m, pyridine-H), 4.26 (2H, s, CH2 S), 3.60 (2H, t, J=6.1 Hz, CH2 O), 2.61 (2H, t, J=7.1 Hz, CH2 CO2), 1.85-1.6 (2H, m, CH2), 1.6-1.4 (2H, m, CH2), 0.88 (9H, s, t-butyl) and 0.03 (6H, s, CH3).
E. t-Butyldimethylsilylenol ether of 5-(tert-butyldimethylsilyloxy)-1-[(pyridin-2-yl)methylthio]valerate ##STR92##
To a cold (ice-MeOH bath) solution of 5-(tert-butyldimethylsilyloxy)-1-[(pyridin-2-yl)methylthio]valerate (30.2 g, 89.0 mmol) in CH2 Cl2 (300 mL) was added triethylamine (27 mL, 196 mmol) followed by the dropwise addition of tert-butyldimethylsilyl trifluoromethanesulfate (41 mL, 178 mmol). The cold bath was removed and the mixture was stirred for 2 h. The mixture was diluted with cold petroleum ether (2,7 L), washed with ice cold water (2×500 mL), ice cold aqueous 1M NaHCO3 (1×500 mL), ice cold water (2×500 mL), brine (500 mL) and dried. Treatment of the organic solution with neutral activated charcoal and filtration afforded the title compound (33 g, 83%) as a red oil in a 45:55 ratio of geometric isomers.
1 H NMR (CDCl3, 200 MHz) δ: 8.54-8.51 (1H, m, pyridine-H), 7.65-7.56 (1H, m, pyridine-H), 7.31-7.23 (1H, m, pyridine-H), 7.16-7.09 (1H, m, pyridine H), 5.02 (0.55H, t, J=7.6 Hz, vinylic H), 4.87 (0.45H, t, J=7.2 Hz, vinylic H), 4.03 (1.1H, s, CH2 S), 3.96 (0.9H, s, CH2 S), 3.55, 3.52, 3.49, 3.46 (2H, 4 lines, J=6.4 Hz, CH2 O), 2.1-1.96 (2H, m, CH2 -vinyl), 1.52-1.29 (2H, m, CH2), 0.985, 0.977 (9H, 2s, t-butyl), 0.879, 0.873 (9H, 2s, t-butyl), 0.236 g, 0.194 g, 0.02 g and 0.013 ppm (12H, 4s, CH3).
F. (3S,4S)-3-[(1'R)-1'-tert-Butyldimethylsilyloxyethyl]-4-[(1"R)-1"-(pyridin- 2-yl)methylthiocarbonyl-4"-tert-butyldimethylsilyloxybutyl]azetidin-2-one ##STR93##
To a cold (ice bath) freshly melt ZnCl2 (10.0 g, 73.5 mmol) under nitrogen was added (3 S,4 R)-4-acetoxy-3-[(1' R)-1'-tert-butyldimethylsilyloxyethyl]azetidin-2-one (10.5 g, 36.7 mmol) in CH2 Cl2 (100 mL) followed by the slow addition of the enol silyl ether (33.2 g, 73.3 mmol) prepared in Step E in CH2 Cl2 (50 mL). The mixture was stirred for 18.5 h at 5°C after which it was diluted with petroleum ether (1 L) and poured on ice and water (500 mL). The organic phase was washed with cold water (2×500 mL), 1M aqueous NH4 Cl (500 mL), water (500 mL), 1M aqueous NaHCO3 (500 mL), water (2×500 mL) brine (500 mL) and dried (MgSO4). The residue was passed through a silica gel pad (100 g, CH2 Cl2, 3%, 5%, 8%, 10%, 20% EtOAcH2 Cl2) to give the title compound (9.2 g, 44%) as a solid; m.p.=110°-111°C (diethyl ether-petroleum ether:1/4).
IR (CH2 Cl2) νmax : 3400 (NH), 1770 and 1680 cm-1 (C═O);
1 H NMR (CDCl3, 200 MHz) δ: 8.54-8.50 (1H, m, pyridine-H), 7.66-7.58 (1H, m, pyridine-H), 7.34, 7.30 (1H, bd, J=7.5 Hz, pyridine-H), 7.2-7.13 (1H, m, pyridine-H), 5.85 (1H, bs, NH), 4.25 (2H, s, CH2 S), 4.20-4.09 (1H, m, H-1'), 3.82 (1H, dd, J=2.0 Hz, J=7.1 Hz, H-4), 3.61-3.55 (2H, m, CH2 O), 3.05-3.02 (1H, m, H-3), 2.84-2.75 (1H, m, H-1"), 1.9-1.4 (4H, m, (CH2)2), 0.98 (3H, d, J=6.3 Hz, CH3), 0.87, 0.85 (18H, 2s, t-butyl), 0.04 and 0.023 ppm (12H, 2s, CH3).
Anal. Calcd. for C28 H50 N2 O4 SSi: C, 59.32; H, 8.89; N, 4.94. Found: C, 59.35; H, 9.03; N, 4.95.
G. (3S,4S)-3-[(1'R)-1'-tert-Butyldimethylsilyloxyethyl]-4-[(1"R)-1"-carboxy-4 "-tert-butyldimethylsilyloxybutyl]azetidin-2-one ##STR94##
A cold (ice bath) solution of (3 S,4 S)-3-[(1'R)-1'-tert-butyldimethylsilyloxyethyl]-4-[(1"R)-1"-(pyridin-2-yl) -methylthiocarbonyl-4"- tert-butyldimethylsilyloxybutyl]azetidin-2-one (7.30 g, 12.9 mmol) in THF (70 mL) was treated with 30% v H2 O2 (4.45 mL, 51.0 mmol) followed by the dropwise addition of 1M aqueous NaOH (38.7 mL, 38.7 mmol). The ice bath was removed and the mixture was stirred for 30 min after which it was cooled again (ice bath). Then 1N aqueous HCl (77 mL) was added in and the mixture was extracted with EtOAc (3×50 mL). The organic extracts were washed with ice cold water (2×50 mL), 1M aqueous NaHSO3 (2×50 mL), ice cold water (3×50 mL), brine and dried (MgSO4) to give the title compound (5.5 g, 92%) as a white solid; m.p.=127°-128°C (petroleum ether/diethyl ether:1/2).
IR (CH2 Cl2) νmax : 3410 (NH), 1755, 1740 and 1710 cm-1 (C═O);
1 H NMR (CDCl3, 200 MHz) δ: 6.28 (1H, bs, NH), 4.23-4.18 (1H, m, H-1'), 3.89 (1H, dd, J=2.0 Hz, J=6.3 Hz, H-4), 3.7-3.55 (2H, m, CH2 O), 3.15-3.05 (1H, m, H-3), 2.8-2.6 (1H, m, H-1"), 1.8-1.5 (4H, m, (CH2)2), 1.17 (3H, d, J=6.3 Hz, CH3), 0.89, 0.86 (18H, 2s, t-butyl), 0.064, 0.057 and 0.051 (12H, 3s, CH3).
Anal. Calc'd. for C28 H45 NO5 Si2 : C, 57.47, H, 9.86, N, 3.05. Found: C, 57.41, H, 10.04, N, 3.07.
H. (3S,4R)-3-[(1'R)-1'-tert-Butyldimethylsilyloxyethyl]-4-[(1"R)1"-(3"-tert-b utyldimethylsilyloxypropyl)-3"-allyloxycarbonyl-2"-oxopropyl]azetidin-2-one ##STR95##
A solution of magnesium bis-allyl malonate (5.7 g, 18.1 mmol) in benzene (80 mL) was heated under reflux, using a Dean Stark condenser. The first 20 mL of benzene were removed and the Dean Stark was replaced by a dropping funnel filled with 3A molecular sieves. The refluxing period was continued for 3 more hours and this solution was allowed to cool down.
In a separate flask, a solution of (3 S,4 S)-3-[(1' R)-1'- tert-butyldimethylsilyloxyethyl]-4-[(1" R)-1"-carboxy-4"- tert-butyldimethylsilyloxybutyl]azetidin-2-one (5.50 g, 12.1 mmol) in toluene (100 mL) was treated with carbonyl diimidazole (2.15 g, 13.3 mmol). The mixture was stirred for 2 h and the solvent was evaporated to give an oil which was pumped under high vacuum for 2 h. The acyl imidazole was then diluted with benzene (20 mL) and added to the benzene solution of magnesium bis-allyl malonate. The mixture was heated at 67°-70°C for 18 h, cooled down, diluted with cold EtOAc, washed with ice cold water (2×100 mL), HCl (100 mL), ice cold water (2×100 mL), 10% aqueous Na2 CO3 (1×100 mL), ice cold water (1×100 mL), brine 100 mL, dried (MgSO4) and treated with activated charcoal. Evaporation of solvent afforded the title compound (6.2 g, 95%) as an oil.
IR (CH2 Cl2) νmax : 3410 (NH), 1765 and 1715 cm-1 (C═O);
1 H NMR (CDCl3, 200 MHz) δ: 12.03, 12.02 (0.5H, 2s, enolylic-H), 6.0-5.8 (1H, m, vinylic-H), 5.87 (1H, bs, NH), 5.38-5.24 (2H, m, vinylic-H), 5.07 (0.52H, s, vinylic-H of enol form), 4.65-4.61 (2H, m, CH2 -vinyl), 4.19-4.1 (1H, m, H-1'), 3.89 (0.5H, dd, J=2.0 Hz, J=6.2 Hz, H-4), 3.82 (0.5H, dd, J=2.0 Hz, J=7.4 Hz, H-4), 3.64-3.4 (2.5H, m, CH2 O and H-1"), 2.97-2.91 (1H, m, H-3), 2.3-2.1 (0.5H, m, H-1"), 1.8-1.4 (4H, m, (CH2)2), 1.17 (1.5H, d, J=6.2 Hz, CH3), 1.11 (1.5H, d, J=6.4 Hz, CH3), 0.88, 0.86 (18H, 2s, tert-butyl), 0.06 and 0.054 ppm (12H, 2s, CH3).
I. (3S,4R)-3-[(1'R)-1'-tert-Butyldimethylsilyloxyethyl]-4-[(1"R)-1"-(3-tert-b utyldimethylsilyloxylpropyl)-3"-diazo-3"-allyloxycarbonyl-2"-oxopropyl]azet idin-2-one ##STR96##
A cold (ice bath) solution of (3S,4R)-3-[(1'R)-1'- tert-butyldimethylsilyloxyethyl]-4-[(1"R)-1"-(3-tert-butyldimethylsilyloxy propyl)-3"-allyloxycarbonyl-2"-oxopropyl]azetidin-2-one (6.20 g, 11.5 mmol) in anhydrous CH3 CN (50 mL) was treated with triethylamine (1.16 mL, 11.5 mmol) followed by the dropwise addition of p-toluenesulfonyl azide (2.27 g, 11.5 mmol) in CH3 CN (10 mL). The mixture was stirred for 3 h at about 22°C and the solvent was removed under vacuum. The oily residue was triturated with hexane and the solid was removed by filtration. The residue, upon evaporation of hexane, was passed through a silica gel pad (100 g, hexane, 20%, 30%, 40% etherexane) to give the title compound as a yellow oil (4.88 g, 75.0%).
IR (CH2 Cl2) νmax : 3410 (NH), 2150 (N2), 1765, 1715 and 1650 cm-1 (C═O);
1 H NMR (CDCl3, 200 MHz) δ: 6.03-5.80 (1H, m, vinylic-H), 5.84 (1H, bs, NH), 5.4-5.28 (2H, m, vinylic-H), 4.73-4.68 (2H, m, vinylic --CH2), 4.23-4.12 (1H, m, H-1'), 4.07-4.0 (1H, m, H-1"), 3.88 (1H, dd, J=2.0 Hz, J=5.5 Hz, H-4), 3.59, 3.56, 3.54 (2H, 3 lines, CH2 O), 3.04 (1H, t, J=2.5 Hz, H-3), 1.9-1.7 (1H, m, H--C--H), 1.6-1.4 (3H, m, HC H and CH2), 1.16 (3H, d, J=6.3 Hz, CH3), 0.87, 0.86 (18H, 2s, tert-butyl), 0.056, 0.050 and 0.027 ppm (12H, 3s, CH3).
J. Allyl (2R,4R,5R,6S)-6-[(1'R)-1'-tert-butyldimethylsilyloxyethyl]-4-(3"-tert-buty ldimethylsilyloxypropyl)-3,7-dioxo-1-azabicyclo[3.2.0]heptane-2-carboxylate ##STR97##
A solution of (3 S,4 R)-3-[(1' R)-1'- tert-butyldimethylsilyloxyethyl]-4-[(1" R)-1"-(3-tert-butyldimethylsilyloxypropyl)-3"-diazo-3"-allyloxycarbonyl-2" -oxopropyl]azetidin-2-one (3.8 g, 6.7 mmol) in benzene (300 mL) was purged with Argon for 10 min. Then Rh(OAc)2 (100 mg) was added in and the mixture was heated under reflux for 70 min. The solvent was removed under vacuum to give the title compound (3.9 g, >100%) as an oil.
IR (CH2 Cl2) νmax : 1765 and 1745 cm-1 (C═O);
1 H NMR (CDCl3, 200 MHz) δ: 5.99-5.79 (1H, m, vinylic H), 5.39-5.20 (2H, m, vinylic H), 4.66-4.60 (2H, m, CH2 -vinyl), 4.63 (1H, s, H-2), 4.36, 4.33, 4.30, 4.27 (1H, 4 lines out of 5, H-1'), 4.24 (1H, dd, J=2.4 Hz, J=8.1 Hz, H-5), 2.7-2.5 (2H, m, CH2 O), 3.31 (1H, dd, J=2.3 Hz, J=5.8 Hz, H-6), 2.8-2.6 (1H, m, H-4), 1.8-1.5 (4H, m, (CH2)2), 1.29 (3H, d, J=6.2 Hz, CH3), 0.881, 0.878 (18H, 2s, tert-butyl), 0.093, 0.085 and 0.033 ppm (12H, 3s, CH3).
K. Allyl (4R,5S,6S)-6-[(1'R)-1'-tert-butyldimethylsilyloxyethyl]-4-(3"-tert-butyldi methylsilyloxxpropyl)-3-[(pyridin-2-yl)methylthio]-7-oxo-1-azabicyclo[3.2.0 ]hept-2-ene-2-carboxylate ##STR98##
A cold (ice-MeOH bath) solution of allyl (2 R,4 R,5 R,6 S)-6-[(1' R)-1'- tert-butyldimethylsilyloxyethyl]-4-(3"- tert-butyldimethylsilyloxypropyl)-3,7-dioxo-1-azabicyclo[3.2.0]heptane-2-c arboxylate (from 3.8 g, 6.7 mmol of the corresponding diazo) in CH3 CN (40 mL) was treated dropwise with diphenyl chlorophosphate (1.52 mL, 7.37 mmol) and N,N-diisopropylethylamine (1.03 mL, 7.37 mmol). The mixture was stirred for 1 h at -15°C to -10°C The resulting enol phosphate was then treated in the cold (-15°C) with 2-picolylmercaptan (1.68 g, 13.4 mmol) in CH3 CN (10 mL) followed by the dropwise addition of N,N-diisopropylethylamine (2.36 mL, 13.4 mmol). The mixture was stirred for 1 h at -10°C to 0°C and then for 1.5 h at 5°C (ice bath). The reaction mixture was diluted with cold EtOAc (300 mL), washed with cold water (2×100 mL), ice cold IM aqueous NaHSO3 (3×100 mL), ice cold water (2×100 mL), 1M aqueous NaHCO3 (2×100 mL) ice cold water (2×100 mL), brine (100 mL) and dried (MgSO4). The residue was passed through a silica gel flash column (60 g, hexane, 5%, 10%, 15%, 20% EtOAcexane) to give the title compound (3.2 g, 74%) as an oil.
IR (CH2 Cl2) νmax : 1770 and 1715 cm-1 (C═O);
1 H NMR (CDCl3, 200 MHz) δ: 8.50-8.48 (1H, m, pyridine-H), 7.7-7.6 (1H, pyridine-H), 7.41-7.36 (1H, bd, J=7.9, pyridine-H), 7.21-7.15 (1H, m, pyridine-H, 6.05-5.8 (1H, m, vinylic H), 5.47-5.19 (2H, m, vinylic-H), 4.9-4.6 (2H, m, CH2 -vinyl), 4.28, 4.21, 4.09, 4.02 (2H, ABq, J=13.8 Hz, CH2 -picolyl), 4.21-4.08 (1H, m, H-1'), 4.01 (1H, dd, J=2.4 Hz, J=9.3 Hz, H-5), 3.7-3.5 (2H, m, CH2 --O), 3.5-3.4 (1H, m, H-4), 3.27 (1H, dd, J=2.5 Hz, J=7.3 Hz, H-6), 1.9-1.4 [4H, m, (CH2)2 ], 1.28 (3H, d, J=6.3 Hz, CH3), 0.877, 0.871 (18H, 2s, tert-butyl), 0.066, 0.057, 0.036 and 0.029 ppm (12H, 4s, CH3).
L. Allyl (4R,5S,6S)-6-[(1'R)-1'-hydroxyethyl]-4-(3"-hydroxypropyl)-3-[(pyridin-2-yl )methylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate ##STR99##
A cold (ice-MeOH bath) solution of allyl (4 R,5 S,6 S)-6-[(1' R)1'- tert-butyldimethylsilyloxyethyl]-4-(3"- tert-butyldimethylsilyloxypropyl)-3-[(pyridin-2-yl)methylthio]-7-oxo-1-aza bicyclo[3.2.0]hept-2-ene-2-carboxylate (3.20 g, 4.95 mmol) in dry THF (60 mL) was treated with CH3 CO2 H (1.72 mL, 30 mmol) followed by the dropwise addition of a 1M solution of tetrabutylammonium fluoride in THF (15 mL, 15 mmol). The mixture was kept in a cold room (5°C) for 30 h, then neutralized (ice bath) with 1M NaHCO3 (30 mL, 30 mmol). The mixture was diluted with EtOAc (200 mL) and the aqueous phase was extracted twice with EtOAc (2×200 mL). The organic extracts were washed with ice cold 1M aqueous NaHCO3 (4×100 mL), ice cold water (2×100 mL), brine (100 mL) and dried (MgSO4). The residue was passed through a silica gel flash column (75 g, CH2 Cl2, 5%, 10%, 20%, 30%, 40%, 60% EtOAcH2 Cl2) to give allyl (4 R,5 S,6 S)-6-[(1' R)-1'- tert-butyldimethylsilyl-oxyethyl]-4-(3"-hydroxypropyl)-3-[(pyridin-2-yl)me thylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate (1.5 g, 57%) as a white solid.
IR (CH2 Cl2) νmax : 3600-3300 (OH), 1770 and 1720 cm-1 (C═O);
1 H NMR (CDCl3, 200 MHz) δ: 8.48-8.45 (1H, m, pyridine-H), 7.77-7.67 (1H, m, pyridine-H), 7.50-7.46 (1H, d, J=7.9 Hz, pyridine-H), 7.26-7.19 (1H, m, pyridine --H), 6.05-5.85 (1H, m, vinylic --H), 5.47-5.20 (2H, m, vinylic-H), 4.84-4.61 (2H, m, vinylic --CH2), 4.46, 4.39, 4.05, 3.98 (2H, ABq, J=14.4 Hz, CH2 -- pyridine), 4.20, 4.16, 4.13 (1H, 3 lines out of 5, H-1'), 3.96 (1H, dd, J=2.5 Hz, J=9.5 Hz, H-5), 3.8-3.6 (2H, m, CH2 O), 3.5-3.3 (1H, m, H-4), 3.22 (1H, dd, J=2.5 Hz, J=7.3 Hz, H-6), 1.9-1.6 (4H, m, (CH2)2), 1.64 (1H, bs, OH), 1.27 (3H, d, J=6.1 Hz, CH3), 0.857 (9H, s, tert-butyl), 0.059 and 0.039 (6H, 2s, CH3).
Elution of the above column with acetone gave the title compound (411 mg, 20%).
IR (CH2 Cl2) νmax : 3700-3200 (OH), 1770 and 1710 cm-1 (C═O);
1 H NMR (CDCl3, 200 MHz) δ: 8.49-8.46 (1H, m, pyridine-H), 7.75-7.66 (1H, m, pyridine-H), 7.48-7.45 (1H, bd, J=8.9 Hz, pyridine-H), 7.23-7.19 (1H, m, pyridine-H), 6.06-5.86 (1H, m, vinylic-H), 5.48-5.21 (1H, m vinylic-H), 4.88-4.60 (2H, m, CH2 -vinylic), 4.41, 4.33, 4.06, 3.98 (2H, ABq, J=14.5 Hz, CH2 -pyridine), 4.22-4.13 (1H, m, H-1'), 4.11, 4.09 (part of dd, J=2.6 Hz, part of H-5), 3.8-3.6 (2H, m, CH2 O), 3.6-3.45 (1H, m, H-4), 3.30 (1H, dd, J=2.6 Hz, J=7.6 Hz, H-6), 1.9-1.5 (5H, m, (CH2)2 and OH), and 1.35 ppm (3H, d, J=6.3 Hz, CH3).
M. Sodium (4R,5S,6S)-6-[(1'R)-1'-hydroxyethyl]-4-(3"-hydroxypropyl)-3-[(pyridin-2-yl )methylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate ##STR100##
To a cold (ice bath) solution of allyl (4 R,5 S,6 S)-6-[(1' R)-1'-hydroxyethyl]-4-(3"-hydroxypropyl)-3-[(pyridin-2-yl)-methylthio]-7-o xo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate (166 mg, 0.400 mmol) in CH2 Cl2 (10 mL) was added Pd(PPh3)4 followed by the dropwise addition of potassium 2-ethylhexanoate (0.5M in EtOAc, 1 mL, 0.5 mmol). The mixture was stirred for 15 min, diluted with diethyl ether (25 mL) and extracted with an ice cold 0.04M aqueous pH 7.0 buffer (3×5 mL). The aqueous extracts were washed with diethyl ether (2×25 mL) and passed through a C18 μBondapak reversed phase column (40 g, H2 O, 1%, 2%, 3%, 5% CH3 CN2 O) to give the title compound (120 mg, 75%) as a lyophilized powder.
Purity 99.6% as determined by HPLC;
UV (H2 O ) λmax : 306 (11900), 266 (8000);
IR (Nujol) νmax : 1745 and 1590 cm-1 (C═O);
1 H NMR (D2 O, 200 MHz) δ: 8.47, 8.45 (1H, bd, J=4.8 Hz, pyridine-H), 7.85 (1H, bt, J=7.8 Hz, pyridine-H), 7.52 (1H, bd, J=7.8 Hz, pyridine-H), 7.39-7.33 (1H, m, pyridine-H), 4.22, 4.17, 4.11, 4.06 (2H, ABq, J=10.5 Hz, CH2 -pyridine), 4.3-4.0 (2H, m, hidden H-1' and H-5), 3.57, 3.54, 3.51 (2H, m, hidden H-1' and H-5), 3.57, 3.54, 3.51 (2H, m, CH2 O), 3.35 (1H, dd, J=2.3 Hz, J=6.0 Hz, H-6), 3.21, 3.17, 3.12 (1H, m, H-4), 2.8-2.2 (4H, m, (CH2)2) and 1.28 ppm (3H, d, J=6.3 Hz, CH3).
(4R,5S,6S)-4-(2"-Aminoethyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(1-methylpyridini um-2-yl)methylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid, phosphate monobasic salt ##STR101##
A suspension of potassium (4R,5S,6S)-4-(2"-azidoethyl)-6-(1'R)-1'-hydroxyethyl]-3-[(pyridin-2-yl)met hylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate (prepared as in Example 6) (0.300 g, 0.70 mmol) in dry acetonitrile (3 mL) was cooled to -20°C and treated with 98% formic acid (0.030 mL, 0.79 mmol). After 15 min, the clear solution was treated with methyl trifluoromethanesulfonate (0.12 mL, 1.06 mmol) and stirred for 1.5 h. The reaction mixture was then quenched by addition of 20 mL of 0.1M pH 7.4 phosphate buffer and the acetonitrile was evaporated under vacuum. The aqueous phase was diluted with 40 mL of 0.1M pH 6.0 phosphate buffer and hydrogenated at 0°C over 30% palladium on Celite (0.40 g) under 45 psi of hydrogen for 1.5 h. The catalyst was filtered on a celite pad and the filtrate was chromatographed on reversed phase silica gel (μ-Bondapak C18, 3×15 cm). Elution with a gradient of acetonitrile (0-5%) in water gave 0.062 g (19%) of the title compound as a white amorphous solid after freeze drying. The purity of the product by 1 H NMR was estimated to 80%.
Purity by HPLC: 97% (μ-Bondapak C18, 3.9 mm×30 cm), elution 10% CH3 CN--H2 O pH 7.4 phosphate buffer, flow rate 1.5 mL/min, uv detector 300 nm, retention time 10.0 min.
UV (H2 O, pH 7.4 phosphate buffer) λmax : 270 nm (6,630) and 300 nm (sh, 3480);
IR (KBr) νmax : 1765 (C═O of β-lactam), 1635, 1610and 1585 cm-1 ;
1 H NMR (200 MHz, D2 O) δ: 1.32 (d, J=6.39 Hz, CH3 CHO), 1.7-2.3 (m, 2H, CH2 -4), 3.1-3.3 (m, 2H, CH2 NH2), 3.37 (dτ, JH4, CH2 =10.1 Hz, JH4,H5 =3.86 Hz, 1H, H-4), 3.53 (dd, JH6, H5 =3.20 Hz, JH6,H1' =6.42 Hz, 1H, H-6), 4.2-4.4 (m, H-5 and H-1' overlapping), 4.40 (s, 3H, CH3 of pyridinium), 7.79 (∼d, J=7.8 Hz, 1H, H-3 of pyridinium), 7.92 (m, 1H, H-5), 8.44 (m, 1H, H-4 of pyridinium) and 8.78 ppm (d, J=5.5 Hz, 1H, H-6 of pyridinium).
(4R,5S,6S)-4-(2"-N,N-Dimethylaminoethyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(pyri din-2-yl)methylthio]-7-oxo-1-azabicyclo[3.2.0]-hept-2-ene-2-carboxylic acid ##STR102##
A solution of (4R,5S,6S)-4-(2"-aminoethyl)-6-[(1'R)-1'-hydroxyethyl]3-[(pyridin-2-yl)met hylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid (Example 2) (0.187 g, 0.51 mmol) in cold water(3 mL) was diluted with CH3 CN (2 mL) and then treated at 0°-5°C with 37% aqueous formaldehyde (0.21 mL). The pH of the solution (pH-meter) was 7.2. Then sodium cyanoborohydride (0.058 g, 0.93 mmol) was added all at once (pH 8.5-9.0) followed after 2 min by glacial acetic acid (3 drops, pH 5.2-5.5). The resulting homogeneous mixture was stirred at 0°-5°C for 30 min. Then 20 mL of 0.1M pH 6.0 phosphate buffer were added and the acetonitrile was removed under vacuum (<15°C). The residual aqueous phase was chromatographed on reversed phase silica gel (μ-Bondapak C18, 2.5×10 cm) using a gradient of acetonitrile (0-10%) in water as eluent. The UV active fractions were collected, freeze dried and chromatographed a second time using the same system. The title compound was obtained as a white amorphous powder: 0.117 g (58%); [α]D22 -4.0° (c 1.0, H2 O).
Purity by HPLC: 88% on μ-Bondapak C18, 3.9 mm×30 cm, flow rate 2 mLin, 5% CH3 CN--H2 O pH 7.4 phosphate buffer, uv detector 300 nm, retention time 9.02 min.
UV (H2 O, pH 7.4 phosphate buffer) λmax : 266 (7,039) and 302 nm (7,707);
IR (KBr) νmax : 1762 (C═O of β-lactam) and 1595 cm-1 (C═O of carboxylic acid);
1 H NMR (200 MHz, D2 O) δ: 1.30 (d, J=6.35 Hz, 3H, CH3 CHO), 1.6-2.2 (m, 2H, CH2 -4), 2.86 (s, 6H, N(CH3)2), 3.15 (m, 3H, H-4 and CH2 N), 3.32 (dd, JH6,H5 =2.91 Hz, JH6,H1' =6.75 Hz, 1H, H-6), 4.10 (ABq, JAB =14.06 Hz, Δν=25.4 Hz, SCH2), 4.1-4.3 (m, 2H, H-5 and CH3 CHO overlapping), 7.38 (m, 1H, H-3 of pyridine), 7.47 (d, J=7.87 Hz, 1H, H-5 of pyridine), 7.86 (m, 1H, H-4 of pyridine) and 8.47 ppm (d, J=5.0 Hz, 1H, H-2 of pyridine).
(4R,5S,6S)-4-(4"-Aminobutyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(pyridin-2-yl)met hylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR103## A. tert-Butyldimethylsilyl 6-(tert-butyldimethylsilyloxy)hexanoate ##STR104##
Saponification of ε-caprolactone (20.6 g, 0.18 mol) as described by P. A. Aristoff et al. in J. Org. Chem., 48, 5341 (1983) gave 30.0 g of the sodium salt as a white solid: 1 H NMR (200 MHz, D2 O) δ: 1.2-1.7 (m, 6H), 2.19 (t, J=7.32 Hz, 2H, CH2 CO2 Na) and 3.61 ppm (t, J=6.51 Hz, 2H, CH2 OH).
The crude salt was suspended in N,N-dimethylformamide (250 mL) cooled to 0°-5°C and treated with tert-butyldimethylsilyl chloride (81.6 g, 0.54 mol) followed by triethylamine (32.6 mL, 0.23 mol) added dropwise. After 26 h at 22°C, the solid formed was filtered and washed with petroleum ether (bp 20°-60° C). After dilution with more petroleum ether (500 mL) the filtrate was washed with saturated NaHCO3, brine and dried (MgSO4). After evaporation of the solvent, the residue was distilled under vacuum to give 60.8 g (93%) of the title ester as a clear oil: bp=106°-107°CB 0.015 torr.
IR (NaCl, film) νmax : 1722 cm-1 (C═O of ester);
1 H NMR (200 MHz, CDCl3) δ: 0.04 and 0.26 (2s, 2×6H, SiCH3), 0.88 and 0.92 (2s, 2×9H, tert-butyl), 1.2-1.7 ppm (m, 6H, CH2 -3,4 and 5).
B. 6-(tert-Butyldimethylsilyloxy)hexanoic acid ##STR105##
A solution of the silyl ester prepared in Step A (82.0 g, 0.227 mol) in a mixture of tetrahydrofuran (800 mL) and water (800 mL) was treated at 22°C with oxalic acid (8.2 g, 0.09 mol) and stirred for 2 h. The reaction mixture was then diluted with EtOAc (1 L), washed with water and brine and dried (MgSO4). Evaporation of the solvent gave 72 g of an oil which is a mixture of the title acid and disiloxane. This product was used without purification in the next step:
IR (NaCl, film) νmax : 1715 cm-1 (C═O of carboxylic acid);
1 H NMR (200 MHz, CDCl3) δ: 0.41 (s, SiCH3), 0.88 (s, Si-tert-butyl), 1.3-1.8 (m, CH2 -3, 4 and 5), 2.3-2.4 (m, CH2 CO2 H) and 3.6-3.7 ppm (m, CH2 OSi).
C. 6-(tert-Butyldimethylsilyloxy)-(pyridin-2-yl)methylthio-hexanoate ##STR106##
A solution of the crude 6-(tert-butyldimethylsilyloxy) hexanoic acid from Step B (∼0.227 mol) in dry CH2 Cl2 (500 mL) was treated at 0°-5°C with 2-picolyl mercaptan (28.4 g, 0.227 mol), 1-hydroxybenzotriazole hydrate (34.8 g, 0.227 mol) and 1,3-dicyclohexylcarbodiimide (46.9 g, 0.227 mol). After 16 h at 22° C., the solid formed was filtered and washed with EtOAc. The flitrates were washed with water, brine and then dried (MgSO4). Evaporation of the solvent gave an oil which was chromatographed on silica gel (9×10 cm). Elution with a mixture of toluene and EtOAc (95:5) gave 40.0 g (50%) of the title thioester as a clear oil:
IR (NaCl, film) νmax : 1695 cm-1 (C═O of thioester);
1 H NMR (200 MHz, CDCl3) δ: 0.28 (s, 6H, SiCH3), 0.88 (s, 9H, t-Bu), 1.3-1.8 (m, 6H, CH2 -3,4 and 5), 2.58 (t, J=7.5 Hz, 2H, CH2 -2), 3.57 (t, J=6.2 Hz, 2H, CH2 -6), 4.24 (s, 2H, CH2 of picolyl), 7.15 (m, 1H, H-5 of pyridine), 7.33 (d, J=7.8 Hz, 1H, H-3 of pyridine), 7.62 (m, 1H, H-4 of pyridine) and 8.52 ppm (d, J=8.5 Hz, 1H, H-6 of pyridine).
D. O-tert-Butyldimethylsilylenol ether of 6-(tert-butyldimethylsilyloxy)-1-(pyridin-2-yl)methylthiohexanoate ##STR107##
A solution of 6-(tert-butyldimethylsilyloxy)-1-(pyridin-2-yl)methylthiohexanoate (40.0 g, 0.113 mol) in dry CH2 Cl2 (400 mL) was treated at 0°-5°C with triethylamine (32 mL, 0.23 mol) followed by tert-butyldimethylsilyl trifluoromethanesulfonate (40 mL, 0.174 mol) added dropwise. The reaction mixture was then stirred at 22°C for 3 h. After dilution with petroleum ether (bp 30°-60°C, 1 L), the organic phase was washed with water, dried (MgSO4) and evaporated under reduced pressure. The residual hard oil (53.0 g) was immediately used as such for the coupling in the next step.
1 H NMR (200 MHz, CDCl3) indicated a 1:1 mixture of E and Z isomers; δ: 3.95 and 4.03 (2×s, SCH2), 4.85 (t, J=7.25 Hz, C═CH) and 5.0 ppm (t, J=7.54 Hz, C═CH).
E. (3S,4S)-3-[(-1'R)-1'-tert-butyldimethylsilyloxyethyl]-4-[1R")-1"-(pyridin- 2-yl)methylthiocarbonyl-5"-tert-butyldimethylsilyloxypentyl]azetidin-2-one ##STR108##
To a suspension of freshly fused zinc chloride (15.4 g, 0.113 mol) in dry CH2 Cl2 (200 mL) at 0°-5°C was added (3 S,4 R)-4-acetoxy-3-[(1' R)-1'-tert-butyldimethylsilyloxyethyl]azetidin-2-one (16.25 g 0.056 mol). Then a solution of the crude silyl enol ether (0.113 mol) prepared in Step D in dry CH2 Cl2 (200 mL) was added dropwise (∼15 min) and the resulting mixture was stirred at 0°-5°C for 18 h. The reaction mixture was then diluted with EtOAc, washed with saturated aqueous ammonium chloride, saturated NaHCO3, brine and dried (MgSO4). Evaporation of the solvent gave a dark residue which was chromatographed on silica gel (15×11 cm). Elution with a mixture of toluene and EtOAc (1:1) gave 23 g (70%) of the title compound as a gum which was used as such in the next step. 1 H NMR indicates a 9:1 β to α ratio of isomers. Crystallization of an aliquot from hexanes gave the pure β isomer of the title compound as white plates; mp=82°-83°C; [α]D22 -9.0° (c 1.0, CHCl3).
UV (EtOH) λmax : 238 (5,080) and 264 nm (4,600);
IR (KBr) νmax : 1770 (C═O) of β-lactam and 1682 cm-1 (C═O of thioester);
1 H NMR (200 MHz, CDCl3) δ: 0.02 and 0.04 (2×s, 2×6H, SiCH3), 0.84 and 0.87 (2×s, 2×9H, Si tert-butyl), 0.97 (d, J=6.31 Hz, 3H, CH3 CHO), 1.2-2.0 (m, 6H, CH2 -2,3,4 of pentyl), 2.8 (m, 1H, H-1 of pentyl), 3.03 (m, 1H, H-6), 3.56 (t, J=5.9 Hz, 2H, CH2 -5 of pentyl), 3.80 (dd, JH4,H3 =2.05 Hz, JH4,H =7.08 Hz, 1H, H-4), 4.14 (m, 1H, CH3 C HO), 4.26 (ABq, JAB =14.0 Hz, Δν=7.3 Hz, 2H, SCH2), 5.88 (broad s, 1H, NH), 7.18 (m, 1H, H-5 of pyridine), 7.33 (d, J=7.8 Hz, 1H, H-3 of pyridine), 7.64 (m, 1H, H-4 of pyridine), and 8.52 ppm (d, J=4.8 Hz, 1H, H-6 of pyridine).
Anal. Calcd for C29 H51 N2 O4 SSi2 : C, 60.06; H, 8.86; N, 4.83; S, 5.53; Found: C, 60.30; H, 8.82; N, 4.72; S, 5.67.
F. (3S,4S)-3-[(1'R)-1'-tert-Butyldimethylsilyloxyethyl]-4-[(1"R)-1"-carboxy-5 "-tertbutyldimethylsilyloxypentyl]azetidin-2-one ##STR109##
A solution of (3S,4R)-3-[(1' R)-1'-tert-butyldimethylsilyloxyethyl]-4-[(1"R)-1"-(pyridin-2-yl)methylthi ocarbonyl-5"-tert-butyldimethyl-silyloxypentyl]azetidin-2-one (23.0 g, 39.7 mmol, mixture of β and α isomer in a ∼9:1 ratio) in tetrahydrofuran (200 mL) was treated at 0°-5°C with 30% hydrogen peroxide (7.0 mL, 81.2 mmol) followed by 80 mL (80.0 mmol) of 1M sodium hydroxide added dropwise. After 2 h at 22°C, the reaction mixture was diluted with EtOAc (500 mL) and acidified with 1N HCl (100 mL). The organic phase was washed with 1N sodium bisulfite (100 mL), brine and dried (MgSO4). Evaporation of the solvent gave a solid which was recrystallized from AcOEt-hexanes to give 12.4 g (66%) of the title compound as a white solid: mp=136°-138°C; [α]D22 -3.6° (c 1.0, CHCl3).
IR (KBr) νmax : 1760 (sh), 1715 (C═O of acid) and 1690 cm-1 ;
1 H NMR (200 MHz, CDCl3) δ: 0.04, 0.05 and 0.06 (3×s, 6H, 3H and 3H, SiCH3), 0.86 and 0.88 (2×s, 2×9H, siτ-Bu), 1.16 (d, J=6.28 Hz, 3H, CH3 CHO), 1.2-1.8 (m, 6H, CH2 -2,3 and 4 of pentyl), 2.6 (m, 1H, H-1 of pentyl), 3.13 (m, 1H, H-3), 3.60 (t, J=5.82 Hz, 2H, CH2 -5 of pentyl), 3.86 (dd, JH4,H3 =1.92 Hz, JH4,H =6.46 Hz, 1H, H-4), 4.20 (dq, JH1',CH3 =6.28 Hz, JH1,H3 =3.86 Hz, 1H, CH3 C HO), and 6.32 ppm (broad s, 1H, NH).
Anal. Calcd. for C23 H47 NO5 Si2 : C, 58.31; H, 10.00; N, 2.96; Found: C, 58.18; H, 10.18; N, 2.91.
G. (3S,4R)-3-[(1'R)-1'-tert-Butyldimethylsilyloxyethyl]-4-[(1"R)-1"-(4-tert-b utyldimethylsilyloxybutyl)-3"-allyloxycarbonyl-2"-oxopropyl]azetidin-2-one ##STR110##
A suspension of (3S,4S)-3-[(1'R)-1'-tert-butyldimethylsilyloxyethyl]-4-[(1"R)-1"-carboxy-5 "-tert-butyldimethylsilyloxypentyl]azetidin-2-one (4.70 g, 9.92 mmol) in dry toluene (125 mL) was treated at 22°C with 1,1-carbonyldiimidazole (1.80 g, 11.1 mmol). After 5 h, the solvent was evaporated under reduced pressure and the residue was dissolved in dry benzene (15 mL). This solution was added to a solution of magnesium monoallyl malonate (4.7 g, 15.3 mmol) in dry benzene (100 mL) and the resulting mixture was stirred at 80°C for 18 h. The reaction mixture was then diluted with EtOAc, washed with cold 1N HCl, saturated NaHCO3, brine and dried (MgSO4). Evaporation of the solvent gave a residue which was chromatographed on silica gel (6.5×11 cm). Elution with a mixture of toluene and EtOAc (8:2) gave 3.48 g (63%) of the title compound as a white solid. 1 H NMR of this product indicated a 1:1 mixture of keto and enol form of the acetoacetate. Recrystallization of the solid in petroleum ether (30°-60°C) at -20° C. gave some pure enol form of the product as white needles: mp=72°-73°C; [α]D22 0° (c 1.0, CHCl3).
UV (EtOH) λmax : 248 nm (11,090);
IR (KBr) νmax : 1761 (C═O of β-lactam) 1718, 1650 and 1625 cm-1 ;
1 H NMR (200 MHz, CDCl3) δ: 0.03 and 0.05 (2×s, 2×6H, SiCH3), 0.86 and 0.88 (2×s, 2×9H, Sit-Bu), 1.10 (d, J=6.29 Hz, 3H, CH3 CHO), 1.2-1.8 (m, 6H, CH2 -1, 2 and 3 of butyl), 2.19 (m, 1H, H-1 of oxopropyl), 2.90 (m, 1H, H-3), 3.59 (t, J=5.96 Hz, CH2 -4 of butyl), 3.81 (dd, JH4,H3 =2.03 Hz, JH4,H1 =7.41 Hz, 1H, H-4), 4.18 (dq, JH,CH3 =6.29 Hz, JH,H3 =3.67 Hz, CH3 CHO), 4.63 (m, 2H, CH2 of allyl), 5.06 (s, 1H, H-3 of oxopropyl enol form), 5.2-5.4 (m, 2H, CH of allyl) and 5.8-6.1 ppm (m, 2H, CH of allyl and NH).
Anal. Calcd for C28 H53 NO6 Si2 : C, 60.50; H, 9.61; N, 2.52; Found: C, 60.62; H, 9.64; N, 2.45.
H. (3S,4R)-3-(1'R)-1'-tert-Butyldimethylsilyloxyethyl)-4-[(1"R)-1"-(4-tert-bu tyldimethylsilyloxybutyl)-3"-diazo-3"-allyloxycarbonyl-2"-oxopropyl]azetidi n-2-one ##STR111##
A solution of (3S,4R)-3-[(1'R)-1'-tert-butyldimethylsilyl-oxyethyl]-4-[(1"R)-1"-(4-tert- butyldimethylsilyloxybutyl)-3"-allyloxycarbonyl-2"-oxopropyl]azetidin-2-one (3.4 g, 6.12 mmol) in acetonitrile (50 mL) was treated at 22°C with p-toluenesulfonyl azide (6.9 mmol, 2.3 mL of a 3M solution in CH3 CN) and triethylamine (0.85 mL, 6.1 mmol). After 1.5 h, the reaction mixture was diluted with EtOAc (200 mL) washed with water, saturated aqueous NaHCO3, brine and dried (MgSO4). Evaporation of the solvent gave a residue which was triturated with a mixture of toluene and EtOAc (9:1∼30 mL). The crystalline p-toluenesulfonamide was filtered and the filtrate was chromatographed on silica gel (5×11 cm). Elution with a mixture of toluene and EtOAc (9:1) gave 3.56 g (100%) of the title compound as a clear oil:
IR (NaCl, film) νmax : 2140 (N2), 1760 (C═O of β-lactam), 1720 (C═O of ester) and 1650 cm-1 ;
1 H NMR (200 MHz, CDCl3) δ: 0.03 and 0.05 (2×s, 2×6H, SiCH3), 0.9 (s, 18H, Si t-Bu), 1.16 (d, J=6.29 Hz, 3H, CH3 CHO), 1.2-1.9 (m, 6H, CH2 -1, 2 and 3 of butyl), 3.04 (m, 1H, H-3), 3.57 (t, J=6.2 Hz, 1H, CH2 -4 of butyl), 3.85 (dd, JH4,H3 =2.11 Hz, JH4,H =5.48 Hz, 1H, H-4), 4.05 (m, 1H, H-1 of oxopropyl), 4.17 (dq, JH,CH3 =6.29 Hz, JH2,H3 =3.68 Hz, 1H, CH3 CHO), 4.7 (m, 2H, CH2 of allyl), 5.3-5.5 (m, 2H, CH of allyl), and 5.8-6.1 ppm (m, 2H, NH and CH of allyl).
I. Allyl (4R,5R,6S)-6-[(1'R)-1'-tert-butyldimethylsilyloxyethyl]-4-(4"-tertbutyldim ethylsilyloxybutyl)-3,7-dioxo-1-azabicyclo[3.2.0]heptane-2-carboxylate ##STR112##
A solution of (3S,4R)-3-[(1'R)-1'-tert-butyldimethylsilyloxyethyl]-4-[(1"R)-1"-(4-tert-b utyldimethylsilyloxybutyl)-3"-diazo-3"-allyloxycarbonyl-2"-oxopropyl]azetid in-2-one (3.50 g, 6.0 mmol) in dry benzene (350 mL) was treated under nitrogen with Rhodium (II) octanoate (0.14 g) and heated under reflux for 45 min. Evaporation of the solvent gave the crude bicyclic ketone as an oil which was used in the next step.
IR (NaCl, film) νmax : 1770 (C═O of β-lactam) and 1745 cm-1 (C═O of keto ester);
1 H NMR (200 MHz, CDCl3) δ: 0.03, 0.08 and 0.09 (3×s, 6H, 3H and 3H, SiCH3), 0.86 (s, 18H, SitBu), 1.1-1.8 (m, 6H, CH2 -1, 2 and 3 of butyl), 1.28 (d, J=6.16 Hz, 3H, CH3 CHO), 2.64 (m, 1H, H-4), 3.22 dd, JH6,H5 =2.36 Hz, JH6,H1' =5.54 Hz, 1H, H-6), 3.6 (m, 2H, CH2 OSi), 4.24 (dd, JH5,H6 =2.36 Hz, JH5,H4 =8.03 Hz, 1H, H-5), 4.30 (m, 1H, CH3 CHO), 4.61 (s, 1H, H-2), 4.64 (m, 2H, CH2 of allyl), 5.2-5.4 and 5.8-6.0 ppm (2×m, 2H and 1H, CH of allyl).
J. Allyl (4R,5S,6S)-6-[(1'R)-1'-tert-butyldimethylsilyloxyethyl)-4-(4"-tert-butyldi methylsilyloxybutyl)-3-[(pyridin-2-yl)methyl-thio]-7-oxo-1-azabicyclo[3.2.0 ]hept-2-ene-2-carboxylate ##STR113##
A solution of allyl (4R,5R,6S)-6-[(1'R)-1'-tert-butyldimethylsilyloxyethyl)-4-(4"-tert-butyldi methylsilyloxybutyl)-3,7-dioxo-1-azabicyclo[3.2.0]heptane-2-carboxylate (6.0 mmol) in dry CH3 CN (35 mL) at 0-5°C was treated, under nitrogen, with diphenyl chlorophosphate (1.4 mL, 6.8 mmol) and N,N-diisopropylethylamine (1.2 mL, 6.9 mmol) added simultaneously over 5 min. 4-N,N-dimethylaminopyridine (∼3 mg) was then added and the resulting mixture was stirred at the same temperature for 1 h. After the addition of 2-picolyl mercaptan (1.5 g, 12.0 mmol) and N,N-diisopropylethylamine, the mixture was stirred at 0°-5° C. for 16 h. The reaction mixture was then diluted with EtOAc, washed with saturated NaHCO3, brine and dried (MgSO4). Evaporation of the solvent gave an oil which was chromatographed on silica gel (5×10 cm). Elution with a mixture of toluene and EtOAc (9:1) gave 2.95 g (74%) of title compound as an oil.
IR (NaCl, film) νmax : 1775 (C═O of β-lactam) and 1710 cm-1 (C═O of ester);
1 H NMR (200 MHz, CDCl3) δ: 0.04, 0.05 and 0.06 (3×s, 6H, 3H and 3H, SiCH3), 0.87 and 0.88 (2×s, 2×9H, Si t-Bu), 1.2-2.0 (m, 6H, CH2 -1, 2 and 3 of butyl), 1.26 (d, J=6.13 Hz, 3H, CH3 CHO), 3.12 (dd, JH6,H5 =2.48 Hz, JH6,H1' =6.68 Hz, 1H, H-6), 3.40 (m, 1H, H-4), 3.59 (m, 2H, CH2 -4 of butyl), 4.03 (dd, JH5,H6 =2.48 Hz, JH5,H4 =9.17 Hz, 1H, H-5), 4.13 (ABq, JAB =14.3 Hz, Δν=30.4 Hz, 2H, SCH2), 4.20 (m, 1H, CH3 C HO), 4.72 (m, 2H, CH2 of allyl), 5.2-5.5 and 5.8-6.1 (2×m, 2H and 1H, CH of allyl), 7.20 (m, 1H, H-5 of pyridyl), 7.4 (d, J=7.9 Hz, 1H, H-3 of pyridine), 7.67 (m, 1H, H-4 of pyridine) and 8.5 ppm (m, 1H, H-6 of pyridine).
K. Allyl (4R,5S,6S)-6-[(1'R)-1'-tert-butyldimethylsilyloxyethyl]-4-(4"-hydroxybutyl )-3-[(pyridin-2-yl)methylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carbox ylate ##STR114##
A solution of allyl (4R,5S,6S)-6-[(1'R)-1'-tert-butyldimethylsilyloxyethyl]-4-(4"-tert-butyldi methylsilyloxybutyl)-3-[(pyridin-2-yl)methylthio]-7-oxo-1-azabicyclo[3.2.0] hept-2-ene-2-carboxylate (2.95 g, 4.46 mmol) in dry tetrahydrofuran (70 mL) was treated at -10°C and under nitrogen with glacial acetic acid (1.6 mL, 28.0 mmol) followed by 13.4 mL of 1.0M tetrabutylammonium fluoride in tetrahydrofuran. The resulting mixture was then stirred at 0°C for 17 h. The reaction mixture was then diluted with EtOAc, washed with cold saturated NaHCO3, brine and dried (MgSO4). Evaporation of the solvent gave an oil which was chromatographed on silica gel (6×8 cm). Elution with a gradient of EtOAc (50→100%) in toluene gave 1.64 g (67%) of the title compound as a clear oil.
IR (NaCl, film) νmax : 1775 (C═O of β-lactam) and 1710 cm-1 (C═O of ester);
1 H NMR (200 MHz, CDCl3) δ: 0.06 and 0.07 (2s, 2×3H, SiCH3), 0.87 (s, 9H, Si t-Bu), 1.28 (d, J=6.08 Hz, 3H, CH3 CHO), 1.3-2.0 (m, 6H, CH2 -1, 2 and 3 of butyl), 3.14 (dd, JH6,H5 =2.54 Hz, JH6,H1, =7.19 Hz, 1H, H-6), 3.37 (m, 1H, H-4), 3.65 (m, 2H, CH2 -4 of butyl), 4.02 (dd, JH5,H6 =2.54 Hz, JH5,H4 =9.37 Hz, 1H, H-5), 4.14 (ABq, JAB =13.8 Hz, Δν=33.2 Hz, 2H, SCH2), 4.2 (m, 1H, CH3 CHO), 4.72 (m, 2H, CH2 of allyl), 5.2-5.5 and 5.9-6.1 (2×m, 2H and 1H, CH of allyl), 7.2 (m, 1H, H-5 of pyridine), 7.4 (d, J=7.9 Hz, 1H, H-3 of pyridine ), 7.68 (m, 1H, H-4 of pyridine) and 8.50 ppm (1H, H-6 of pyridine).
L. Allyl (4R,5S,6S)-4-(4"-azidobutyl)-6-[(1'R)-1'-tert-butyldimethylsilyloxyethyl]- 3-[(pyridin-2-yl)methylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxyl ate ##STR115##
A solution of allyl (4R,5S,6S)-6-[(1'R)-1'-tert-butyldimethylsilyloxy]-4-(4"-hydroxybutyl)-3-[ (pyridin-2-yl)methylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate (1.64 g, 3.0 mmol) in dry tetrahydrofuran (250 mL) was treated at -20°C and under nitrogen with triphenylphosphine (1.26 g, 4.8 mmol) and 8.5 mL (5.1 mmol) of a 0.6M solution of hydrazoic acid in toluene. Then diethyl azodicarboxylate (0.80 mL, 5.08 mmol) was added dropwise over 5 min. After 30 min at -20°C, the reaction mixture was quenched by addition of EtOAc and saturated aqueous NaHCO3. The organic phase was washed with brine and dried (MgSO4). Evaporation of the solvent under reduced pressure gave an oil which was triturated with toluene (∼25 mL). The crystalline diethyl hydrazine dicarboxylate was filtered and the filtrate was treated in the same manner with diethyl ether to crystallize the triphenylphosphine oxide. The residue was finally chromatographed on silica gel (5×9 cm) using a mixture of, toluene and EtOAc (8:2) as eluent. Evaporation of the UV active fractions gave 1.60 g (93%) of the title compound as a clear oil.
IR (NaCl, film) νmax : 2100 (N3), 1775 (C═O of β-lactam) and 1710 cm-1 (C═O of ester);
1 H NMR (200 MHz, CDCl3) δ: 0.06 and 0.07 (2×s, 2×3H, SiCH3), 0.88 (s, 9H, Si t-Bu), 1.29 (d, J=6.07 Hz, 3H, CH3 CHO), 1.2-1.9 (m, 6H, CH2 -1, 2 and 3 of butyl), 3.10 (dd, JH6,H5 =2.55 Hz, JH6,H1' =7.20 Hz, 1H, H-6), 3.29 (t, J=6.2 Hz, 2H, CH2 N3) 3.42 (m, 1H, H-4), 4.02 (dd, JH5,H6 =2.55 Hz, JH5,H4 =9.36 Hz, 1H, H-5), 4.13 (ABq, JAB =14.0 Hz, Δν=31.9 Hz, 2H, SCH2), 4.19 (m, 1H, overlapping with SCH2, CH3 CHO), 4.72 (m, 2H, SCH2 of allyl), 5.2-5.5 and 5.9-6.1 (2×m, 2H and 1H, CH of allyl), 7.21 (m, 1H, H-5 of pyridine), 7.41 (d, J=7.8 Hz, 1H, H-3 of pyridine), 7.69 (m, 1H, H-4 of pyridine) and 8.50 ppm (m, 1H, H-6 of pyridine).
M. Allyl (4R,5S,6S)-4-(4"-azidobutyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(pyridin-2-yl)me thylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate ##STR116##
A solution of allyl (4R,5S,6S)-4-(4"-azidobutyl)-6-[(1'R)-1'-tert-butyldimethylsilyloxyethyl]- 3-[(pyridin-2-yl)-methylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxy late (1.60 g, 2.80 mmol) in dry tetrahydrofuran (40 mL) was treated at 5°C with acetic acid (1.0 mL, 17.5 mmol) and then 8.4 mL (8.4 mmol) of a 1.0M solution of tetrabutylammonium fluoride in tetrahydrofuran. After 112 h at 5°C the reaction mixture was diluted with EtOAc, washed with saturated NaHCO3 and brine and dried (MgSO4). Evaporation of the solvent gave an oil which was chromatographed on silica gel (4×11 cm). Elution with a mixture of toluene and EtOAc (1:1) gave 0.57 g (36%) of recovered starting material. Then elution with EtOAc gave 0.76 g (59%, 92% based on recovered starting material) of the title compound as an oil.
IR (NaCl, film) νmax : 2100 (N2), 1772 (C═O of β-lactam) and 1708 cm-1 (C═O of ester);
1 H NMR (200 MHz, CDCl3) δ: 1.38 (d, J=6.28 Hz, 3H, CH3 CHO), 1.3-1.9 (m, 6H, CH2 -1, 2 and 3 of butyl), 1.84 (d, J=5.2 Hz, 1H, OH), 3.15 (dd, JH6,H5 =2.64 Hz JH6,H1' =7.28 Hz, 1H, H-6), 3.31 (t, J=6.2 Hz, 2H, CH2 N3), 3.48 (m, 1H, H-4), 4.13 (dd, JH5,H6 =2.64 Hz, JH5,H4 =9.43 Hz, 1H, H-5), 4.11 (ABq, JAB =14.16 Hz, Δν=33.3 Hz, 2H, SCH2), 4.2 (m, 1H, CH3 CHO), 4.74 (m, 2H, CH2 of allyl), 5.2-5.5 and 5.9-6.1 (m, 2H, CH of allyl), 7.2 (m, 1H, H-5 of pyridine), 7.40 (d, J=7.9 Hz, 1H, H-3 of pyridine), 7.67 (m, 1H, H-4 of pyridine) and 8.50 ppm (m, 1H, H-6 of pyridine).
N. (4R,5S,6S)-4-(4"-Aminobutyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(pyridin-2-yl)me thylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR117##
A solution of allyl (4R,5S,6S)-4-(4"-azidobutyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(pyridin-2-yl)me thylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate (0.76 g, 1.66 mmol) in dry CH2 Cl2 was treated at 0°-5°C and under nitrogen with tetrakis(triphenylphosphine)palladium[O] (0.14 g) and 3.6 mL (1.8 mmol) of a 0.5M solution of potassium 2-ethylhexanoate in EtOAc. After 30 min the reaction mixture was diluted with diethyl ether (150 mL) and extracted three times with 75 mL of 0.05M pH 7.0 phosphate buffer. The combined aqueous extracts were diluted with 75 mL of 1M NaH2 PO4 (resulting pH 5.8) and then hydrogenated over 30% Palladium on Celite (0.8 g) under 45 psi at 0°-5°C for 1.5 h. The catalyst was then filtered and the filtrate was concentrated to ∼50 mL under vacuum (<15°C). Chromatography of the residue on reversed phase silica gel (μ-Bondapak C18, 5×9 cm) using a gradient of acetonitrile (0-10%) in water gave first 0.125 g (17%) of potassium (4R,5S,6S)-6-[(1'R)-1'-hydroxyethyl]-4-(4"-hydroxybutyl)-3-[(pyridin-2-yl) methylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate as a white powder after lyophilisation.
The end fractions then gave 0.273 g (42%) of the title compound as a white powder after freeze drying. By 1 H NMR and HPLC this product was contaminated by 7% of the above hydroxybutyl side product. A portion of the product, 0.175 g, was purified a second time by chromatography to give 0.152 g (87% recovery) of the pure title compound: [α]D 0° (c 1.0, H2 O,
Purity by HPLC: 94% on μ-Bondapak C18, 3.9 mm×30 cm, elution 5% CH3 CN-H2 O pH 7.4 phosphate buffer, flow rate 1.5 mLin, uv detector 306 nm, retention time 8.92 min.
UV (H2 O, pH 7.4 phosphate buffer) λmax : 266 (6,490) and 306 nm (9,377);
IR (KBr) νmax : 1758 (C═O of β-lactam) and 1590 cm-1 (C═O of carboxylate);
1 H NMR (200 MHz, CDCl3) δ: 1.29 (d, J=6.36 Hz, 3H, CH3 CHO), 1.2-1.8 (m, 6H, CH2 -1, 2 and 3 of butyl), 2.97 (t, J=7.6 Hz, 2H, CH2 NH2), 3.16 (m, 1H, H-4), 3.29 (dd, JH6,H5 =2.52 Hz, JH6,H1' =6.35 Hz, 1H, H-6), 4.0-4.3 (m, 4H, H-5, CH3 C HN and SCH2 overlapping), 7.37 (m, 1H, H-5 of pyridine), 7.52 (d, J=7.9 Hz, 1H, H-3 of pyridine), 7.86 (m, 1H, H-4 of pyridine), and 8.47 ppm (m, 1H, H-6 of pyridine).
Potassium (4R,5S,6S)-6-[(1'R)-1'-hydroxyethyl]-4-(4"-hydroxybutyl)-3-[(pyridin-2-yl) methylthio]-7-oxo-1-azabicyclo[3.2.0]-hept-2-ene-2-carboxylate ##STR118## A. Allyl (4R,5S,6S)-6-[(1'R)-1'-hydroxyethyl]-4-(4"-hydroxybutyl)-3-[(pyridin-2-yl) methylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate ##STR119##
A solution of allyl (4R,5S,6S)-6-[(1'R)-1'-tert-butyldimethylsilyloxyethyl]-4-(4"-tert-butyldi methylsilyloxybutyl)-3-[(pyridin-2-yl)methylthio]-7-oxo-1-azabicyclo[3.2.0] hept-2-ene-2-carboxylate (prepared in Example 12, Step J) (0.67 g, 1.01 mmol) in dry tetrahydrofuran (15 mL) was treated at -10°C and under nitrogen with acetic acid (0.7 mL, 12.2 mmol) followed by 6.0 mL (6.0 mmol) of a 1.0M solution of tetrabutylammonium fluoride in tetrahydrofuran. After 140 h at 0°-5°C, the reaction mixture was diluted with EtOAc, washed with saturated NaHCO3, brine and dried (MgSO4). Evaporation of the solvent gave an oil which was chromatographed on silica gel (3×7 cm). Elution with a gradient of CH3 CN in EtOAc first gave 0.17 g (30%) of the monodeprotected allyl (4R,5S,6S)-6-[(1'R)-1'-tert-butyldimethylsilyloxyethyl]-4-(4"-hydroxybutyl )-3-[(pyridin-2-yl)methylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carbox ylate as an oil which is identical to compound of Example 12, Step K.
Elution with acetonitrile then gave 0.20 g (45%) of the title compound as an oil.
IR (NaCl, film) νmax : 3400 (OH), 1770 (C═O of β-lactam) and 1705 cm-1 (C═O of carboxylate);
1 H NMR (200 MHz, CDCl3) δ: 1.37 (d, J=6.26 Hz, 3H, CH3 CHO), 1.3-2.0 (m, 6H, CH2 -1, 2 and 3 of butyl), 3.21 (dd, JH6,H5 =2.65 Hz, JH6, H1' =8.09 Hz, 1H, H-6), 3.44 (m, 1H, H-4) 3.68 (∼t, J=5.0, 2H, CH2 OH), 4.1-4.2 (m, overlapping with SCH2, 2H, H-5 and CH3 CHO), 4.14 (ABq, JAB =14.08 Hz, Δν=35.7 Hz, 2H, SCH2), 4.74 (m, 2H, CH2 of allyl), 5.2-5.5 and 5.9-6.1 (2×m, 2H and 1H, CH of allyl),7.21 (m, 1H, H-5 of pyridine), 7.42 (d, J=7.8 Hz, 1H, H-3 of pyridine), 7.69 (m, 1H, H-4 of pyridine) and 8.5 ppm (m, 1H, H-6 of pyridine).
B. Potassium (4R,5S,6S)-6-[(1'R)-1'-hydroxyethyl]-4-(4"-hydroxybutyl)-3-[(pyridin-2-yl) methylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate ##STR120##
A solution of allyl (4R,5S,6S)-6-[(1'R)-1'-hydroxyethyl]-4-(4"-hydroxybutyl)-3-[(pyridin-2-yl) methylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate (0.20 g, 0.46 mmol) in dry dichloromethane (10 mL) was treated at 22°C and under nitrogen with triphenylphosphine (0.020 g), tetrakis (triphenylphosphine) palladium[O] (0.020 g) and 1.0 mL (0.5 mmol) of a 0.5M solution of potassium 2-ethylhexanoate in ethyl acetate. After 20 min, the reaction mixture was extracted with water (3×10 mL) and the combined aqueous extracts were maintained under vacuum to remove traces of organic solvent. Chromatography on reversed phase silica gel (μ-Bondapak C-18, 3.5×6.5 cm, elution 0-5% CH3 CN in water) gave 0.151 g (75%) of the title compound as a white amorphous solid after freeze drying: [α]D22 -4.1° (c 1.0, H2 O).
Purity by HPLC: 99% (μ-Bondapak C-18, 3.9 mm×30 cm, elution 5% CH3 CN-H2 O pH 7.4 phosphate buffer, flow rate 2 mLin, uv detector 304 nm, retention time 10.0 min.
UV (H2 O, pH 7.4 phosphate buffer) λmax : 266 (7,243) and 306 nm (10,819);
IR (KBr) νmax : 1750 (C═O of β-lactam) and 1590 cm-1 (C═O of carboxylate);
1 H NMR (200 MHz, D2 O) δ: 1.28 (d, J=6.33 Hz, 3H, CH3 CHO), 1.1-1.7 (m, 6H, C H2 C H2 C H2 CH2 OH) 3.13 (m, 1H, H-4) 3.32 (dd, JH6,H5 =2.50 Hz, JH6,H1' =5.93 Hz, 1H, H-6), 3.56 (t, J=6.3 Hz, CH2 OH), 4.14 (ABq, JAB =14.5 Hz, Δν=24.6 Hz, 2H, SCH2), 4.0-4.3 (m overlapping with SCH2, 2H, H-5 and CH3 C HO), 7.37 (m, 1H, H-5 of pyridine), 7.52 (d, J=7.9 Hz, 1H, H-3 of pyridine), 7.86 (m, 1H, H-4 of pyridine) and 8.47 ppm (d, J=4.9 Hz, 1H, H-6 of pyridine).
(4R,5S,6S)-4-[4"-(N-Formimidoyl)aminobutyl]-6-[(1'R)-1'-hydroxyethyl]-3-[(p yridin-2-yl)methylthio]-7-oxo-1-azabicyclo[3.2.0]-hept-2-ene-2-carboxylic acid ##STR121##
A solution of (4R,5S,6S)-4-(4"-aminobutyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(pyridin-2-yl)me thylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid (0.098 g, 0.25 mmol) in 25 mL of 0.04M pH 7.0 phosphate buffer at 0°C, was adjusted to pH 8.5 with 0.1M sodium hydroxide. Benzylformimidate hydrochloride (0.43 g, 2.5 mmol) was then added in small portions (∼10min) while maintaining the pH around 8.3 with 0.1M NaOH. After 15 min at 0°-5°C, the pH of the solution was adjusted to 7.0 with 0.1M HCl, and the aqueous phase was washed with EtOAc. The aqueous phase was then maintained under vacuum to remove traces of organic solvent and then chromatographed on reversed phase silica gel (μ-Bondapak C-18, 3.5×6.5 cm, elution with a gradient of acetonitrile 0-5% in water). Lyophilization of the UV active fractions gave 0.076 g (72%) of the title compound as a white amorphous powder: [α]D22 +2.4° (c 1.0, H2 O).
Purity by HPLC: 97.9% on μ-Bondapak c-18, 3.9 mm×30 cm, elution 10% CH3 CN-H2 O, pH 7.4 phosphate buffer, flow rate 1 mLin, uv detector 306 nm, retention time 8.68 min.
UV (H2 O, pH 7.4 phosphate buffer) λmax : 266 (6,680) and 306 nm (8,980);
IR (KBr) νmax : 1758 (C═O of β-lactam), 1715 and 1590 (C═O of carboxylate);
1 H NMR (200 MHz, D2 O) δ: 1.28 (d, J=6.31 Hz, CH3 CHO), 1.2-1.7 (m, 6H, CH2 CH2 CH2 CH2 NH), 3.16 (∼t, 1H, H-4), 3.3 (m, 3H, H-6 and CH2 NHCH═NH overlapping), 4.0-4.3 (m, 4H, H-5, CH3 CHO and SCH2 overlapping), 7.37 (m, 1H, H-5 of pyridine), 7.53 (d, J=7.9 Hz, 1H, H-3 of pyridine), 7.79 (s, 1H, NH-- CH═NH), 7.86(m, 1H, H-4 of pyridine) and 8.47 ppm (d, J=4.4 Hz, 1H, H-6 of pyridine).
(4R,5S,6S)-4-[2"-(N-Guanidinyl)aminopropyl]-6-[(1'R)-1'-hydroxyethyl]-3-[(p yridin-2-yl)methylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR122##
A solution of sodium (4R,5S,6S)-4-(3"-azidopropyl)-6-[(1' R)-1'-hydroxyethyl]-3-[(pyridin-2-yl)methylthio]-7-oxo-1-azabicyclo[3.2.0] hept-2-ene-2-carboxylate (120 mg, 0.28 mmol) [obtained by treating the compound of Example 7, Step H by the general procedure described in Example 6, Step D] in a 0.1M aqueous pH 5.9 phosphate buffer (8.4 mL, 0.84 mmol), water (8 mL) was shaken in a Parr hydrogenator at 40-50 psi hydrogen for 90 min at 5°C to 15°C (temperature at the end of the reaction) using 30% Pd on Celite (60 mg) as catalyst. The catalyst was removed by filtration and the pH of the aqueous solution was adjusted to 8.5 with 0.1N aqueous NaOH solution. To this solution was added at 5°C (ice bath) aminoiminomethanesulfonic acid (360 mg, 3.0 mmol) and the pH was kept at 8-8.5 by addition of the 0.10N aqueous NaOH solution. This mixture was stirred for 30 min and then neutralized to pH 7.0 with a 0.1N aqueous HCl solution. It was passed twice through a C18 μBondapak (6 g and 3 g) column (H2 O→15% CH3 CN2 O) to give the title compound (15 mg, 13%).
Purity by HPLC: 100% (304 nm, 10% CH3 CN/KH2 PO4 0.01M, 7.4), r.t. 7.3 min;
UV (H2 O) λmax : 266 (5830), 306 (8250);
IR (Nujol) νmax : 3500-3000 (OH and NH2), 1755, 1590 (C═O), and 1660, 1630 cm-1 (C═N);
1H NMR (D2 O, 200 MHz) δ: 8.47-8.45 (1H, m, aromatic-H), 7.9-7.81 (1H, m, aromatic-H), 7.54-7.50 (1H, bd, J=7.9 Hz, aromatic-H), 7.40-7.34 (1H, m, aromatic-H), 4.25-4.16 (1H, m, H-1'), 4.22, 4.17, 4.10, 4.03 (2H, ABq, J=14.4 Hz, CH2 pyridine), 4.06 (≈0.5H, d, J=2.3 Hz, part of H-5), 3.24 (1H, dd, J=2.7 Hz, J=6.3 Hz, H-6), 3.2-3.1 (2H, m, CH2 --N), 3.27-3.1 (1H, m, hidden H-4), 1.7-1.1 (4H, m, CH2 CH2) and 1.28 (3H, d, J=6.3 Hz, CH3).
Sodium (4R,5S,6S)-6-[(1'R)-1'-hydroxyethyl]-4-(2"-methylcarbamoyloxyethyl)-3-[(py ridin-2-yl)methylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate ##STR123## A. Allyl (4R,5S,6S)-6-[(1'R)-1'-(tert-butyldimethylsilyloxyethyl]-4-(2"-methylcarba moyloxyethyl)-3-[(pyridin-2-yl)-methylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2 -ene-2-carboxylate ##STR124##
To a cold (0°C) solution of allyl (4R,5S,6S)-[(1'R)-1'-(tert-butyldimethylsilyloxyethyl)]-4-(2"-hydroxyethyl )-3- [(pyridin-2-yl)methylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxyla te (0.27 g, 0.52 mmol) prepared in Example 6, Step A in CH2 Cl2 (5 mL), under Argon, was added methyl isocyanate (0.31 mL, 5.23 mmol). The reaction mixture was stirred between 0° and 5°C for 48 h at which time ∼10% of the starting material remained unreacted. The solvent was evaporated to give a foam which was chromatographed on silica (2.5×9 cm) packed in CH2 Cl2 and eluted with a mixture of CH2 Cl2 and EtOAc (1:1, gradient elution) to give the title compound (0.26 g, 87%).
1 H NMR (200 MHz, CDCl3 7.24) δ: 0.02 (s, 3H, SiCH3), 0.04 (s, 3H, SiCH3), 0.82 (s, 9H, SiC(CH3)3, 1.24 (d, CH3, JCH3, 1' =6.14 Hz), 1.69-1.85 (m, 1H, CH2), 2.05-2.18 (m, 1H, CH2), 2.79 (d, NHC H3, J=4.81 Hz), 3.16 (dd, H-6, J5,6 =2.33 Hz, J6,1' =6.74 Hz), 3.47 (t, H-4, J=9.69 Hz), 3.84-4.39 (m, 6H, C H2 O , C HOH, H-5, SC H2), 4.57-4.83 (m, OC H2, allyl), 5.18-5.46 (m, ═C H2, allyl), 5.8-6.02 (m, C H═, allyl), 7.19 (m, H-5, py, J4,5 =7.72 Hz, J5,6 =4.77 Hz), 7.48 (d, H-3, py, J3,4 =7.82 Hz), 7.69 (dt, H-4, py, J4,6 =1.64 Hz), 8.45 (dd, H-6, py).
B. Allyl (4R,5S,6S)-6-[(1'R)-1'-hydroxyethyl]-4-(2"-methylcarbamoyloxyethyl)-3-[(py ridin-2-yl)methylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate ##STR125##
A cold (0°C) solution of allyl (4R,5S,6S)-6-[(1'R)-1'-(tert-butyldimethylsilyloxyethyl)]-4-(2"-methylcarb amoyloxyethyl)-3-[(pyridin-2-yl)methylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2 -ene-2-carboxylate (0.25 g, 0.43 mmol) in dry THF (5 mL) was treated with acetic acid (0.15 mL, 2.6 mmol) followed by a 1M solution of tetrabutylammonium fluoride in THF (1.3 mL, 1.3 mmol). The mixture was stirred between 0° and 5°C for 120 h at which time about half the starting material remained unreacted. The mixture was neutralized at 0°C with a 1M NaHCO3 solution (2.6 mL, 2.6 mmol) and extracted with EtOAc (3×50 mL). The combined organic extract was washed successively with a cold 1M NaHCO3 solution, water and brine, dried (MgSO4) and solvent evaporated to a solid plus syrup which was chromatographed on silica (2.5×9 cm) packed in CH2 Cl2 and eluted first with a mixture of CH2 Cl2 and EtOAc (gradient elution), then with EtOAc and finally with a mixture of CH3 CN and CH2 Cl2 (1:1, gradient elution) to give the title compound as a white powder (0.1 g, 50%).
1 H NMR (200 MHz, CDCl3 7.24) δ: 1.37 (d, CH3, JCH3,1' =6.25 Hz), 1.66-1.84 (m, 1H, CH2), 2.11-2.27 (m, 1H, CH2), 2.78 (d, NHC H3, J=4.95 Hz), 3.32 (dd, H-6, J5,6 =2.52 Hz, J6,1,' =8.47 Hz), 3.45 (t, H-4, J=10.26 Hz), 3.93-4.31 (m, 6H, C H2 O, C HOH, H-5, SC H2), 4.59-4.87 (m, OC H2, allyl), 5.19-5.48 (m, ═CH2, allyl), 5.84-6.04 (m, CH═, allyl), 7.19 (m, H-5, py, J4,5 =7.71 Hz, J5,6 =5.31 Hz), 7.41 (d, H-3, py, J3,4 =7.85 Hz), 7.66 (dt, H-4, py, J4,6 =1.77 Hz), 8.45 (m, H-6, py, J3,6 =0.96 Hz).
C. Sodium (4R,5S,6S)-6-[(1'R)-1'-hydroxyethyl]-4-(2"-methylcarbamoyloxyethyl)-3-[(py ridin-2-yl)methylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate ##STR126##
A cold (0°C) solution of allyl (4R,5S,6S)-6-[(1'R)-1'-hydroxyethyl]-4-(2"-methylcarbamoyloxyethyl)-3-[(py ridin-2-yl)methylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate (0.094 g, 0.204 mmol) in CH2 Cl2 (10 mL) was treated with Pd[Ph3 P]4 (0.03 g, 0.026 mmol) followed by a 0.5M solution of sodium 2-ethylhexanoate in EtOAc (0.45 mL, 0.224 mmol). The mixture was stirred at 0°C for 2 h and then extracted with water (3×15 mL). The combined aqueous phase was passed through a column of μ-Bondapak C-18 reverse phase silica (2.5×9 cm). The title compound was eluted with a mixture of water and CH3 CN (95:5, gradient elution) and was obtained as a white fluffy solid after lyophilization (0.062 g, 69%).
Purity by HPLC: 99.7%, UV detection at 304 nm on μ-Bondapak C-18 (4 mm×30 cm), 8% CH3 CN in pH 7.4 phosphate buffer, flow rate 1 mLin, retention time 9.04 min.
UV (pH 7.4) λmax : 304 (8778).
IR (nujol) νmax : 1750 cm-1 (C═O, β-lactam), 1710 cm-1 (NHCO).
1 H NMR (200 MHz, D2 O) δ: 1.305 (d, CH3, JCH3,1' =6.38 Hz), 1.6-1.73 (m, 1H, CH2), 2.00-2.07 (m, 1H, CH2), 2.71 (s, NCH3), 3.23 (t, H-4, J=9.7 Hz), 3.48 (dd, H-6, J5,6 =2.61 Hz, J6,1' =5.84 Hz), 3.93-4.31 (m, 6H, C H2 O , C HOH, H-5, SC H2), 7.39 (dd, H-5, py, J5,6 =4.84 Hz, J4,5 =7.74 Hz), 7.52 (d, H-3, py, J3,4 =7.84 Hz), 7.89 (dt, H-4, py, J4,6 =1.72 Hz), 8.48 (d, H-6, py).
(4R,5S,6S)-4-(4"-Aminobutyl)-3-[(2-cyanoethyl)thio]-6-[(1'R)-1'-hydroxyethy l]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR127## A. Allyl (4R,5S,6S)-6-[(1'R)-1'-tert-butyldimethylsilyloxyethyl]-4-(4"-tert-butyldi methylsilyloxybutyl)-3-[(2-cyanoethyl)thio]-7-oxo-1-azabicyclo[3.2.0]hept-2 -ene-2-carboxylate ##STR128##
A solution of allyl (4R,5R,6S)-6-[(1'R)-1'-tert-butyldimethylsilyloxyethyl]-4-(4"-tert-butyldi methylsilyloxybutyl)-3,7-dioxo-1-azabicyclo[3.2.0]heptane-2-carboxylate (6.87 mmol, prepared from 4.0 g, 6.87 mmol of diazo precursor according to the procedure of Example 12, Step I), in dry CH3 CN (40 mL) was treated at 0°-5°C and under nitrogen with diphenyl chlorophosphate (1.56 mL, 7.52 mmol) and N,N-diisopropylethylamine (1.31 mL, 7.52 mmol) added simultaneously over 5 min. A small crystal of 4-N,N-dimethylaminopyridine was then added and the mixture was stirred for 1 h. The solution was then cooled to -20°C and treated with β-mercaptopropionitrile [L. Bauer and T. L. Welsh, J. Org. Chem., 26, 1443 (1961)] (1.23 g, 14.1 mmol) in acetonitrile (5 mL), followed by N,N-diisopropylethylamine (1.31 mL, 7.52 mmol). The temperature of the solution was then allowed to reach 0°-5°C, and the mixture was stirred for 2 h. The reaction mixture was then diluted with EtOAc, washed with saturated aqueous NaHCO3, brine and dried (MgSO4). Evaporation of the solvent gave an oil which was chromatographed on silica gel (5×9 cm). Elution with a gradient of EtOAc (0-5%) in toluene gave 3.42 g (80%) of the title compound as an oil.
IR (NaCl, film) νmax : 2260 (CN), 1778 (C═O of β-lactam) and 1715 cm-1 (C═O of ester);
1 H NMR (200 MHz, CDCl3) δ: 0.04 and 0.08 (2×s, 2×6H, SiCH3), 0.88 and 0.89 (2×s, 2×9H, Si tert-Bu) 1.27 (d, J=6.14 Hz, 3H, CH3 CHO), 1.3-1.8 (m, 6H, CH2 -1, 2 and 3 of butyl), 2.5-3.2 (m, 6H, S CH2 C H2 CN, H-4 and H-6 overlapping), 3.61 (m, 2H, CH2 OSi), 4.1-4.3 (m, 2H, H-5 and CH3 C HO overlapping), 4.7 (m, 2H, CH2 of allyl), 5.2-5.5 and 5.9-6.1 ppm (2×m, 2H and 1H, CH of allyl).
B. Allyl (4R,5S,6S)-6-[(1'R)-1'-tert-butyldimethylsilyloxvethyl)-3-[(2-cyanoethyl)t hio]-4-(4"-hydroxybutyl)-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate ##STR129##
A solution of allyl (4R,5S,6S)-6-[(1'R)-1'-tert-butyldimethylsilyloxyethyl]-4-(4"-tert-butyldi methylsilyloxybutyl)-3-[(2-cyanoethyl)thio]-7-oxo-1-azabicyclo[3.2.0]hept-2 -ene-2-carboxylate (3.42 g, 5.49 mmol) in dry tetrahydrofuran (75 mL) was treated at 0°-5°C with acetic acid (1.9 mL, 33.2 mmol) followed by 16.5 mL (16.5 mmol) of a 1.0M solution of tetrabutylammonium fluoride in tetrahydrofuran. After 24 h at 4°C, the reaction mixture was diluted with EtOAc, washed with saturated aqueous NaHCO3, brine and dried (MgSO4). Evaporation of the solvent gave an oil which was chromatographed on silica gel (5×11 cm). Elution with a mixture of toluene and EtOAc (1:1 to AcOEt) gave 1.67 g (68%) of the title compound as an oil.
IR (NaCl, film) νmax : 3500 (OH), 2250 (CN), 1775 (C═O of β-lactam) and 1710 cm-1 (C═O of ester);
1 H NMR (200 MHz, CDCl3) δ: 0.08 (s, 6H, SiCH3), 0.88 (s, 9H, Sit-Bu), 1.29 (d, J=6.12 Hz, 3H, CH3 CHO), 1.2-1.9 (m, 6H, CH2 -1, 2 and 3 of butyl), 2.68 (m, 2H, CH2 CN), 2.7-3.2 (m, 3H, H-4 and SCH2), 3.21 (dd, JH6,H5 =2.62 Hz, JH6,H1 =6.78 Hz, 1H, H-6), 3.66 (m, 2H, CH2 OH), 4.2 (m, 2H, H-5 and CH3 C HO overlapping), 4.74 (m, 2H, CH2 of allyl), 5.2-5.5 and 5.9-6.1 ppm (2×m, 2H and 1H, CH of allyl).
C. Allyl (4R,5S,6S)-4-(4"-azidobutyl)-6-[(1'R)-1'-tert-butyldimethylsilyloxyethyl]- 3-[(2-cyanoethyl)thio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate ##STR130##
A solution of allyl (4R,5S,6S)-6-[(1'R)-1'-tert-butyldimethylsilyloxyethyl]-3-[(2-cyanoethyl)t hio]-4-(4"-hydroxybutyl)-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate (1.67 g, 3.28 mmol) in dry tetrahydrofuran (250 mL) was treated at -20°C with triphenylphosphine (1.38 g, 5.26 mmol) and 7.6 mL (5.7 mmol) of a 0.75M solution of hydrazoic acid in toluene. Then diethyl azodicarboxylate (0.90 mL, 5.7 mmol) was added dropwise over 5 min and the resulting mixture was stirred at the same temperature for 30 min. The reaction mixture was quenched by addition of EtOAc and saturated aqueous sodium bicarbonate. The organic phase was washed with brine, dried (MgSO4) and concentrated under reduced pressure. The residual oil was triturated with toluene (25 mL) and filtered to remove the crystalline diethyl hydrazine dicarboxylate. After a similar treatment with diethyl ether to remove the triphenylphosphine oxide, the filtrate was chromatographed on silica gel (4.5×11 cm). Elution with a mixture of toluene and EtOAc (8:2) gave 1.40 g (80%) of the title compound as an oil.
IR (NaC1, film) νmax : 2250 (CN), 2100 (N3), 1765 (C═O of β-lactam) and 1710 cm-1 (C═O of ester);
1 H NMR (200 MHz, CDCl3) δ: 0.08 (s, 6H, SiCH3), 0.89 (s, 9H, t-Bu), 1.30 (d, J=6.12 Hz, 3H, CH3 CHO), 1.2-1.9 (m, 6H, CH2 -1, 2 and 3 of butyl), 2.68 (m, 2H, CH2 CN), 2.9-3.2 (m, 3H, H-4 and SCH2), 3.17 (dd, JH6, H5 =2.58 Hz, JH6,H1 =6.9 Hz, H-6), 3.32 (broad t, J=6.0 Hz, 2H, CH2 N3), 4.1-4.3 (m, 2H, H-5 and CH3 CHO overlapping), 4.74 (m, 2H, CH2 of allyl), 5.2-5.5 and 5.9-6.1 ppm (2×m, 2H and 1H, CH of allyl).
D. Allyl (4R,5S,6S)-4-(4"-azidobutyl)-3-[(2-cyanoethyl)thio]-6-[(1'R)-1'-hydroxyeth yl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate ##STR131##
A solution of allyl (4R,5S,6S)-4-(4"-azidobutyl)-6-[(1'R)-1'-tert-butyldimethylsilyloxyethyl]- 3-[(2-cyanoethyl)thio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate (1.40 g, 2.62 mmol) in dry tetrahydrofuran (40 mL) was treated at 0°-5°C with acetic acid (1.0 mL, 17.5 mmol) followed by 8.4 mL (8.4 mmol) of a 1.0M solution of tetrabutylammonium fluoride in tetrahydrofuran. The solution was stored at 5°C for 10 days. The reaction mixture was then diluted with cold EtOAc, washed with saturated NaHCO3, brine and dried (MgSO4). Evaporation of the solvent gave an oil which was chromatographed on silica gel (4.5×11 cm) using a gradient of EtOAc in toluene (1:1 to EtOAc) as eluent.
The early fractions gave 0.23 g (16%) of recovered starting material. The following fractions then gave 0.78 g (71%) of the title compound as an oil.
IR (NaCl, film) νmax : 3500 (OH), 2250 (CN), 2100 (N3), 1770 (C═O of β-lactam) and 1710 cm-1 (C═O of ester);
1 H NMR (200 MHz, CDCl3) δ: 1.40 (d, J=6.26 Hz, 3H, CH3 CHO), 1.4-1.8 (m, 6H, CH2 -1, 2 and 3 of butyl), 1.83 (d, J=5.1 Hz, 1H, OH), 2.9-3.3 (m, 3H, H-4 and SCH2), 3.22 (dd, JH6,H5 =2.75 Hz, JH6,H1' =7.37 Hz, 1H, H-6), 3.34 (broad t, J=6.0 Hz, 2H, CH2 N3), 4.25 (m overlapping with H-5, 1H, CH3 CHO), 4.28 (dd, JH5,H6 =2.75 Hz, JH5,H4 =9.58 Hz, 1H, H-5), 4.77 (m, 2H, CH2 of allyl), 5.2-5.5 and 5.9-6.1 ppm (2×m, 2H and 1H, CH of allyl).
E. (4R,5S,6S)-4-(4"-Aminobutyl)-3-[(2-cyanoethyl)thio]-6-[(1'R)-1'-hydroxyeth yl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR132##
A solution of allyl (4R,5S,6S)-4-(4"-azidoethyl)-3-[(2-cyanoethyl)thio]-6-[(1'R)-1'-hydroxyeth yl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate (0.78 g, 1.86 mmol) in dry CH2 Cl2 (50 mL) was treated at 0°-5°C and under nitrogen, with tetrakis(triphenylphosphine)palladium[O] (0.1 g) and 4.1 mL (2.05 mmol) of a 0.5M solution of potassium 2-ethylhexanoate in EtOAc. After 30 min, the reaction mixture was diluted with diethyl ether (150 mL) and extracted with 0.05M pH 7.0 aqueous phosphate buffer (3×75 mL). The combined aqueous phase was adjusted to pH 5.8 with 1M NaH2 PO4 and the traces of organic solvent were removed under vacuum. The aqueous solution was hydrogenated at 0°-5°C over 30% palladium on Celite under 45 psi for 2 h. The catalyst was then filtered on a Celite pad and washed with water. HPLC (μ-Bondapak C-18, elution 5% CH3 CN--H2 O pH 6.8 phosphate buffer) indicated a 70:30 mixture of the 4"-aminobutyl compound (eluted first) and the 4-hydroxybutyl compound.
The solution was then chromatographed rapidly on reversed phase silica gel (μ-Bondapak C-18, 4×7 cm, elution H2 O--CH3 CN 5%) to remove the inorganic salts. The UV active fractions were lyophilized and chromatographed on the same column using 5% CH3 CN--H2 O, 0.01M pH 6.8 phosphate buffer as eluent. Two main fractions were obtained which were again desalted on reversed phase silica gel. Lyophilisation of the first fraction gave 0.33 g (50%) of the title 4"-aminobutyl compound as a white amorphous powder. By HPLC and 1 H NMR this fraction was ∼90% pure and was contaminated by some 4"-hydroxybutyl compound and other impurities.
The second fraction gave 0.102 g (14%) of the 4-hydroxybutyl compound as a white amorphous powder, 90% pure by HPLC and 1 H NMR which is used in Example 18.
Careful chromatography of the above, 4'-aminobutyl compound on reversed phase (μ-Bondapak C-18, same conditions as above) gave pure fractions of the title compound: [α]D22 +60.4° (c 1.0, H2 O).
Purity by HPLC: 98.5% on μ-Bondapak C-18, 3.9 mm×30 cm, elution 5% CH3 CN--H2 O pH 7.4 phosphate buffer, flow rate 1 mLin, UV detector 306 nm, retention time 5.25 min;
UV (H2 O, pH 7.4 phosphate buffer) λmax : 300 nm (10,267);
IR (KBr) νmax : 2250 (CN), 1760 (C═O of β-lactam) and 1690 cm-1 (C═O of carboxylate);
1 H NMR (200 MHz, D2 O) δ: 1.33 (d, J=6.38 Hz, 1H, CH3 CHO), 1.3-1.9 (m, 6H, CH2 -1, 2 and 3 of bury1), 2.86 (m, 2H, CH2 CN), 2.9-3.2 (m, 2H, SCH2), 3.02 (t, J=7.6 Hz, 2H, CH2 NH2), 3.4 (m, JH6,H5 =2.66 Hz, 2H, H-6 and H-4 overlapping), and 4.3 ppm (m, 2H, H-5 and CH3 C HO overlapping).
Potassium (4R,5S,6S)-3-[(2-cyanoethyl)thio]-4-(4"-hydroxybutyl)-6-[(1'R)-1'-hydroxye thyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate ##STR133##
The crude fraction containing the 4"-hydroxybutyl compound (0.102 g, 90% pure) obtained by hydrogenation of the azido precursor in Example 17, Step E was purified by preparative HPLC (Zorbax ODS, Dupont, 21.2 mm×25 cm, elution 5% CH3 CN--H2 O pH 6.8 potassium phosphate buffer, UV detector) followed by desalting on μ-Bondapak C-18. Lyophilization gave 0.045 g (45% recovery) of the title compound as a white amorphous powder.
Purity by HPLC: 99% on μ-Bondapak c-18, 3.9 mm×30 cm, elution 10% CH3 CN--H2 O pH 7.4 phosphate buffer, flow rate 0.6 mLin, uv detector 306 nm, retention time 6.93 min;
UV (H2 O, pH 7.4 phosphate buffer) λmax : 302 nm (7,364);
IR (KBr) νmax : 2250 (CN) 1750 (C═O of β-lactam) and 1600 cm-1 (C═O of carboxylate);
1 H NMR (200 MHz, D2 O) δ: 1.33 (d, J=6.41 Hz, 3H, CH3 CHO), 1.3-2.0 (m, 6H, CH2 -1, 2 and 3 of butyl), 2.86 (m, 2H, CH2 CN), 2.8-3.3 (m, 2H, SCH2), 3.35 (m, 1H, H-4), 3.43 (dd, JH6,H5 =2.59 Hz, JH6,H1 =6.0 Hz, 1H, H-6), 3.62 (t, J=6.3 Hz, 2H, CH2 OH), and 4.3 ppm (m, 2H, H-5 and CH3 CHO overlapping).
(4R,5S,6S)-3-[(2-Cyanoethyl)thio]-4-[4"-(N-formimidoyl)amino-butyl]-6-[(1'R )-1'-hydroxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR134##
A cold (0°-5°C) solution of (4R,5S,6S)-4-(4"-aminobutyl)-3-[(2-cyanoethyl)thio]-6-[(1'R)-1'-hydroxyeth yl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid (0.113 g, 0.32 mmol) in 30 mL of 0.04M pH 7.0 phosphate buffer was adjusted to pH 8.5 with 0.1M NaOH. Then benzylformimidate hydrochloride (0.54 g, 3.17 mmol) was added in small portions while maintaining the pH at 8.0-8.5 with 0.1N NaOH (∼10 min). After 10 min, the pH was adjusted to 7.0 with 0.1N HCl, and the reaction mixture was washed with EtOAc. The aqueous phase was maintained under vacuum to remove traces of organic solvent and then chromatographed on reversed phase silica gel (μ-Bondapak c-18, 3.5×7 cm). Elution with a gradient of acetonitrile (0-10%) in water gave 0.106 g (86%) of the title compound as a white amorphous powder after freeze drying: [α]D22 +53.5° (c 1.0, H2 O ).
Purity by HPLC: 93% on μ-Bondapak C-18, 3.9 mm×30 cm, elution 5% CH3 CN--H2 O pH 7.4 phosphate buffer, flow rate 1 mLin, uv detector 300 nm, retention time 7.74 min.
UV (H2 O, pH 7.4 phosphate buffer) λmax : 300 nm (10,481);
IR (KBr) νmax : 2250 (CN), 1760 (C═O of β-lactam) and 1715 cm-1 (C═O of carboxylate);
1 H NMR (200 MHz, D2 O) δ: 1.34 (d, J=6.34 Hz, 3H, CH3 CHO), 1.3-2.0 (m, 6H, CH2 -1, 2 and 3 of butyl), 2.8-2.9 (m, 2H, CH2 CN), 2.9-3.3 (m, 2H, SCH2), 3.3-3.5 (m, 4H, H-4, H-6 and CH2 N), 4.3 (m, 2H, H-5 and CH3 CHO overlapping), and 7.81 ppm (s, 1H, CH═N).
(4R,5S,6S)-3-[(2-Cyanoethyl)thio]-4-(4"-N,N-dimethylaminobutyl)-6-[(1'R)-1' -hydroxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR135##
A solution of (4R,5S,6S)-4-(4"-aminobutyl)-3-[(2-cyanoethyl)thio]-6-[(1'R)-1'-hydroxyeth yl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid (0.054 g, 0.15 mmol) in water (1 mL) at 0°-5°C, was diluted with acetonitrile (1 mL) and then treated with 37% aqueous formaldehyde (0.075 mL, 0.81 mmol) followed by sodium cyanoborohydride (0.024 g, 0.38 mmol) and one drop of acetic acid. After 15 min, the reaction mixture was quenched by the addition of 0.2M pH 6.0 phosphate buffer and the organic solvent was removed in vacuo. The aqueous phase was then chromatographed on reversed phase silica gel (μ-Bondapak C-18, 3.5×6.5 cm). Elution with a gradient of acetonitrile (0-10%) in water gave 0.016 g (27%) of the title compound as a white amorphous powder after lyophilization.
Purity by HPLC: 96% on μ-Bondapak C-18, 3.9 mm×30 cm, elution 5% CH3 CN--H2 O pH 7.0 phosphate buffer, flow rate 1 mLin, UV detector 300 nm, retention time 10.9 min.
UV (H2 O, pH 7.4 phosphate buffer) λmax : 300 nm (9,907);
IR (KBr) νmax : 2250 (weak CN), 1759 (C═O of β-lactam) and 1590 cm-1 (C═O of carboxylate);
1 H NMR (200 MHz, D2 O) δ: 1.33 (d, J=6.37 Hz, 3H, CH3 CHO), 1.3-1.9 (m, 6H, CH2 -1, 2 and 3 of butyl), 2.87 (s, 6H, N(CH3)2), 2.87 (m overlapping with NCH3, 2H, CH2 CN), 2.9-3.2 (m, 2H, SCH2), 3.15 (∼t overlapping with SCH2, 2H CH2 N(CH3)2), 3.38 (dd, JH6,H5 =2.6 Hz, JH6,H1 =6.25 Hz, 1H, H-6), 3.38 (m overlapping with H-6, 1H, H-4), and 4.27 ppm (m, 2H, H-5 and CH3 CHO).
Sodium (4R,5S,6S)-4-(3"-azidopropyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(2-hydroxyethyl )thio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate ##STR136## A. (3S,4R)-3-[(1'R)-1'-Hydroxyethyl]-4-[(1"R)-1"-(3-azidopropyl)-3"-diazo-3"- allyloxycarbonyl-2"-oxopropyl]azetidin-2-one ##STR137##
To a cold (ice bath) solution of (3 S,4 R)-3-[(1' R)-1'- tert-butyldimethylsilyloxyethyl]-4-[(1" R)-1"-(3-azidopropyl)-3"-diazo-3"-allyloxycarbonyl-2"-oxopropyl]azetidin-2 -one (2.4 g, 5.0 mmol) from Example 7, Step E in EtOH (50 mL) was added a 2N aqueous HCl solution (7 mL). The ice bath was removed and the mixture was stirred for 20 h. The pH of the solution was adjusted to 7 with a 1M aqueous NaHCO3 solution (15 mL) and ethanol was removed under vacuum. The residue obtained was diluted with EtOAc, washed with a 1M aqueous NaHCO3 solution (18 mL), water (10 mL), brine (10 mL) and dried (MgSO4). The residue was passed through a silica gel flash (40 g) column (5, 10, 20, 40, 60, 80% EtOAcH2 Cl2) to give the title compound (1.7 g, 93%) as an oil that crystallized out.
IR (CH2 Cl2) νmax : 3600, 3500 (OH) 3400 (NH) 2150 (N2), 2100 (N3), 1765, 1715 and 1650 cm-1 (C═O);
1 H NMR (CDCl3, 200 MHz) δ: 6.04-5.84 (1H, m, vinylic-H), 6.01 (1H, bs, NH), 5.42-5.29 (2H, m, vinylic-H), 4.75-4.63 (2H, m, CH2 vinyl), 4.19-4.01 (1H, m, H-1'), 4.02-3.89 (1H, m, H-1"), 3.83 (1H, dd, J=6.5 Hz, J=2.1 Hz, H-4), 3.31-3.25 (2H, m, CH2 N3), 3.01 (1H, dd, J=1.9 Hz, J=6.9 Hz, H-3), 2.23 (1H, d, J=3.9 Hz, OH), 1.98-1.75 (1H, m, HCH), 1.73-1.48 (3H, m, CH2 --HC H) and 1.29 ppm (3H, d, J=6.3 Hz, CH3).
B. Allyl (2R,4R,5R,6S)-4-(3"-azidopropyl)-6-[(1'R)-1'-hydroxyethyl]-3,7-dioxo-1-aza bicyclo[3.2.0]heptane-2-carboxylate ##STR138##
A solution of (3 S,4 R)-3-[(1' R)-1'-hydroxyethyl]-4-[(1" R)-1"-(3-azidopropyl)-3"-diazo-3"-allyloxycarbonyl-2"-oxopropyl]azetidin-2 -one (1.46 g, 4.00 mmol) and Rh(OAc)2 (56 mg) in benzene (140 mL) was heated under reflux for 40 min. Benzene was removed under vacuum to give the title compound (1.5 g, 100%) as an oil;
IR (CH2 Cl2) νmax : 3610 (OH), 2100 (N3), 1770 and 1745 cm-1 (C═O);
1 H NMR (CDCl3, 200 MHz) δ: 5.96-5.8 (1H, m, vinylic H), 5.39-5.25 (2H, m, vinylic H), 4.75-4.64 (2H, m, CH2 -vinylic), 4.66 (1H, s, H-2), 4.35-4.26 (1H, m, H-1'), 4.29 (1H, dd, J=2.2 Hz, J=8.1 Hz, H-5), 3.45-3.25 (2H, m, CH2 N3), 3.29 (1H, dd, J=2.4 Hz, J=7.7 Hz, H-6), 2.8-2.6 (1H, m, H-4), 1.9-1.5 (4H, m, OH, CH2 --CH2) and 1.42 ppm (3H, t, J=6.2 Hz, CH3).
C. Allyl (4R,5S,6S)-4-(3"-azidopropyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(2-hydroxyethyl )thio]-7-oxo-1-azabicyclo[3.2.0]-hept-2-ene-2-carboxylate ##STR139##
A cold (ice-MeOH bath) solution of allyl (2 R,4 R,5 R,6 S)-4-(3"-azidopropyl)-6-[(1' R)-1'-hydroxyethyl]-3,7-dioxo-1-azabicyclo[3.2.0]heptan-2-carboxylate (1.5 g, 4.00 mmol) in CH3 CN (30 mL) was treated dropwise with diphenyl chlorophosphate (0.88 mL, 4.4 mmol) and N,N-diisopropylethylamine (0.76 mL, 4.4 mmol). The mixture was stirred for 45 min and the resulting enol phosphate was silylated by the successive addition of trimethylsilyl chloride (0.57 mL, 4.4 mmol) and N,N-diisopropylethylamine (0.76 mL, 4.4 mmol). The mixture was stirred for 35 min and the protected enol phosphate was then treated with 2-mercaptoethanol (624 mg, 8.00 mmol) and N,N-diisopropylethylamine (1.39 mL, 8.00 mmol). The mixture was stirred, allowed to stand at 5°C for 24 h and then was diluted with cold EtOAc (100 mL). It was washed with cold 1N aqueous HCl (1×50 mL), ice cold water (2×50 mL), a cold 1M NaHCO3 solution (1×50 mL), ice cold water (2×50 mL), brine (50 mL) and dried (MgSO4). The residue obtained upon evaporation of the solvent was diluted with THF (30 mL, distilled over Naenzophenone) and treated first with AcOH (1.3 mL, 24 mmol) and then dropwise with a 1M tetrabutylammonium fluoride solution in THF (12.0 mL, 12 mmol) at -25°C (CH3 CN/dry ice bath). The mixture was stirred for 20 min, then diluted with cold EtOAc (150 mL). It was washed with an ice cold 1M aqueous NaHCO3 solution (3×50 mL), ice cold water (3×50 mL), brine (50 mL) and dried (MgSO4). The residue obtained upon solvent evaporation was passed through a silica gel flash (100 g) column (EtOAc-CH2 Cl2 ; 10%→100%) to give title compound (795 mg, 50 %) as a semi-crystalline oil;
IR (CH2 Cl2) νmax : 3600 (OH), 2100 (N3), 1775 and 1710 cm-1 (C═O);
1 H NMR (CDCl3, 200 MHz) δ: 6.04-5.90 (1H, m, vinylic H), 5.50-5.23 (2H, m, vinylic-H), 4.82-4.63 (2H, m, CH2 -vinylic), 4.27-4.19 (1H, m, H-1'), 4.22 (1H, dd, J=2.7 Hz, J=9.5 Hz, H-5), 3.9-3.75 (2H, m, CH2 O), 3.42-3.26 (2H, m, CH2 --N3 and H-4), 3.24 (1H, dd, J=2.7 Hz, J=7.3 Hz, H-6), 3.08-2.8 (2H, m, SCH2), 2.3-1.9 (1H, bs, OH), 1.95-1.54 (4H, m, CH2 --CH2) and 1.37 ppm (3H, d, J=6.2 Hz, CH3).
D. Sodium (4R,5S,6S)-4-(3"-azidopropyl)-6-[(1'R)-1'R)-1'-hydroxyethyl]-3-2-hydroxyet hyl)thio-7-oxo-1-azabicyclo3.2.0]-hept-2-ene-2-carboxylate ##STR140##
A cold (ice bath) solution of allyl (4 R,5 S,6 S)-4-(3"-azidopropyl)-6-[(1' R)-1'-hydroxyethyl]-3-[(2-hydroxyethyl)thio]-7-oxo-1-azabicyclo[3.2.0]hept -2-ene-2-carboxylate (63 mg, 0.16 mmol) in CH2 Cl2 (7 mL) was treated with Pd(PPh3)4 (12 mg, 0.012 mmol) and a 0.5M solution of sodium 2-ethylhexanoate in ethyl acetate (0.32 mL, 0.16 mmol). The mixture was stirred at 5°C for 40 min, then diluted with diethyl ether (30 mL) and extracted with a cold pH 7.0 buffer solution (3×3.5 mL) and water (1×3 mL). The aqueous extracts were combined, washed with diethyl ether (2×10 mL), passed through a μBondapak C18 (15 g) reversed phase column (H2 O, 1,2,3,4% CH3 CN2 O) to give the title compound (30 mg, 50%) after lyophilization.
Purity by HPLC: 98.6% (5% CH3 CN/buffer pH 7.40.014M), retention time 8.87 min;
UV (H2 O) λmax : 304 (10,770);
IR (Nujol) νmax : 3600-3100 (OH), 2100 (N3), 1750 and 1600 cm-1 (C═O);
1H NMR (D2 O, 200 MHz) δ: 4.35-4.20 (1H, m, H-1'), 4.22 (1H, dd, J=2.4 Hz, J=9.3 Hz, H-5), 3.8-3.7 (2H, m, CH2 O), 3.45-3.3 (4H, CH2 N3, H-6 and H-1'), 3.11-2.8 (2H, m, SCH2), 1.95-1.45 (4H, m, CH2 CH2) and 1.33 ppm (3H, d, J=6.4 Hz, CH3).
Sodium (4R,5S,6S)-6-[(1'R)-1'-hydroxyethyl]-4-(2"-azidoacetoxyethyl)-3-[(pyridin- 2-yl)methylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate ##STR141## A. Allyl (4R,5S,6S)-6-[(1'R)-1'-(tert-butyldimethylsilyloxyethyl)]-4-(2"-azidoaceto xyethyl)-3-[(pyridin-2-yl)methylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2 -carboxylate ##STR142##
To a solution of allyl (4R,5S,6S)-6-[(1'R)-1'-(tert-butyldimethylsilyloxyethyl)]-4-(2"-hydroxyeth yl)-3-[(pyridin-2-yl)methylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carb oxylate (0.5 g, 0.96 mmol) [prepared in Example 6, Step A] in CH2 Cl2 (10 mL) at 0°C, under Argon, was added pyridine (0.1 mL, 1.2 mmol) followed by a solution of azidoacetyl chloride (0.14 g, 1.2 mmol) in CH2 Cl2 (2 mL). The reaction mixture was stirred at 0°C for 30 min. and then diluted with EtOAc (40 mL) and washed successively with a cold pH 7 phosphate buffer solution and brine. After drying (MgSO4) the solvent was evaporated to a syrup which was chromatographed on silica (2.3×11 cm) packed in CH2 Cl2 and eluted with a mixture of CH2 Cl2 and EtOAc (8:2, gradient elution) to give the title compound as a syrup (0.423 g, 73%).
1 H NMR (200 MHz, CDCl3) δ: 0.04 (s, 3H, SiCH3), 0.05 (s, 3H, SiCH3), 0.84 (s, 9H, SiC(CH3)3), 1.28 (d, CH3, JCH3,1' =6.12 Hz), 1.70-1.87 (m, 1H, CH2), 2.16-2.33 (m, 1H, CH2), 3.16 (dd, H-6, J5,6 =2.64 Hz, J6,1' =7.04 Hz), 3.67 (m, H-4, J=2.1, 8.03, 10.63 Hz), 3.98 (s, C H2 N3) 3.83-4.43 (overlapping, 6H, C H2 O, C HOH, H-5, SC H2) 4.57-4.82 (m, OC H2 allyl), 5.18-5.45 (m, ═C H2, allyl), 5.82-6.01 (m, CH═, allyl), 7.17 (m, H-5, py, J4,5 =7.68 Hz, J5,6 =4.9 Hz), 7.38 (d, H-3, py, J3,4 =7.83 Hz), 7.66 (dt, H-4, py, J4,6 =1.8 Hz), 8.45 (m, H-6, py, J3,6 =0.8 Hz).
B. Allyl (4R,5S,6S)-6-[(1'R)-1'-hydroxyethyl]-4-(2"-azidoacetoxyethyl)-3-[(pyridin- 2-yl)methylthio]-7-oxo-1-azabicyclo[3.2.0]-hept-2-ene-2-carboxylate ##STR143##
A cold (0°C) solution of allyl (4R,5S,6S)-6-[(1'R)-1'-(tert-butyldimethylsilyloxyethyl)]-4-(2"-azidoaceto xyethyl)-3-[(pyridin-2-yl)methylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2 -carboxylate (0.423 g, 0.7 mmol) in dry THF (8 mL) was treated with acetic acid (0.24 mL, 4.22 mmol) followed by a 1M solution of tetrabutylammonium fluoride in THF (2.11 mL, 2.11 mmol). The mixture was stirred between 0° and 5°C for 120 h at which time ∼25% of the starting material remained unreacted. The mixture was neutralized at 0°C with a 1M NaHCO3 solution (4.3 mL, 4.22 mmol) and extracted with EtOAc (3×50 mL). The combined organic phase was washed successively with a cold 1M NaHCO3 solution; water and brine, dried (MgSO4) and solvent evaporated to give a sticky gum which was chromatographed on silica (2.5×12 cm) packed in CH2 Cl2 and eluted with a mixture of CH2 Cl2 and EtOAc (3:7, gradient elution) to give the title compound (0.23 g, 68%).
1 H NMR (200 MHz, CDCl3 7.24) δ: 1.38 (d, CH3, JCH3,1' =6.24 Hz), 1.71-1.87 (m, 1H, CH2), 2.26-2.38 (m, 1H, CH2), 3.24 (dd, H-6, J5,6 =2.82 Hz, J6,1' =8.08 Hz), 3.7 (m, H-4, J=2.16, 9.79 Hz), 3.86-4.53 (m, 8H, C H2 O, C H2 N3, C HOH, H-5, SC H2), 4.57-4.85 (m, OC H2, allyl), 5.19-5.45 (m, ═C H2, allyl), 5.83-6.02 (m, CH═, allyl), 7.14-7.21 (m, H-5, py, J3,5 =1.03 Hz, J4,5 =7.71 Hz, J5,6 =4.82 Hz), 7.38 (d, H-3, py, J3,6 =0.98 Hz, J3,4 =7.86 Hz), 7.65 (dt, H-4, py, J3,4 =7.86 Hz, J4,6 =1.81 Hz), 8.46 (m, H-6, py).
C. Sodium (4R,5S,6S)-6-[(1'R)-1'-hydroxyethyl]-4-(2"-azidoacetoxyethyl)-3-[(pyridin- 2-yl)methylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate ##STR144##
To a cold (0°C) solution of allyl (4R,5S,6S)-6-[(1'R)-1'-hydroxyethyl]-4-(2"-azidoacetoxyethyl)-3-[(pyridin- 2-yl)methylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate (0.22 g, 0.46 mmol) in CH2 Cl2 (10 mL), under Argon, was added Pd[Ph3 P]4 (0.08 g, 0.07 mmol) followed by a 0.5M solution of sodium 2-ethylhexanoate in EtOAc (1.01 mL, 0.5 mmol). The mixture was stirred at 0°C for 2 h and then extracted with water (3×15 mL). The combined aqueous phase was passed through a column of μ-Bondapak C-18 reverse phase silica (2.5×10 cm). The title compound was eluted with a mixture of water and CH3 CN (9:1, gradient elution) and was obtained as a white fluffy solid after lyophilization (0.1 g, 48%).
1 H NMR (200 MHz, D2 O) δ: 1.31 (d, CH3, JCH3,1' =6.4 Hz), 1.65-1.84 (m, 1H, CH2), 2.03-2.2 (m, 1H, CH2), 3.28 (dt, H-4, J=2.72, 11.33 Hz) 3.48 (dd, H-6 J5,6 =2.64 Hz J6,1' =6.03 Hz), 4.13 (s, 2H, C H2 N3), 4.05-4.35 (m, 6H, C H2 O, C HOH, H-5, SC H2), 7.39 (m, H-5, py, J4,5 =7.73 Hz, J5,6 =4.92 Hz), 7.51 (d, H-3, py, J3,4 =7.83 Hz), 7.87 (dt, H-4, py, J4,6 =1.75 Hz), 8.48 (d, H-6, py).
(4R,5S,6S)-6-[(1'R)-1'-Hydroxyethyl]-4-(2"-aminoacetoxyethyl)-3-[(pyridin-2 -yl)methylthio]-7-oxo-1-azabicyclo-[3.2.0]-hept-2-ene-2-carboxylic acid ##STR145##
A solution of sodium (4R,5S,6S)-6-[(1'R)-1'-hydroxyethyl]4-(2"-azidoacetoxyethyl)-3-[(pyridin-2 -yl)methylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate (0.08 g, 0.17 mmol) in a 0.05M solution of pH 7 sodium phosphate buffer (20 mL) was hydrogenated at 0°C over 5% palladium on BaSO4 (0.04 g) at 40 psi for 30 min. The catalyst was filtered and washed with water. The combined aqueous solution was passed through a column of μ-Bondapak C-18 reverse phase silica (2.5×10 cm). The compound was eluted with a mixture of water and CH3 CN (9:1, gradient elution). The first compound obtained was shown to be the sodium (4R,5S,6S)-6-[(1'R)-1'-hydroxyethyl]-4-(2"-hydroxyethyl)-3-[(pyridin-2-yl) methylthio]-7-oxo-1-azabicyclo-[3.2.0]hept-2-ene-2-carboxylate as a result of ester cleavage. The title compound was eluted next and was obtained as a white fluffy solid after lyophilization (0.035 g, 49%).
Purity by HPLC: 93.1% (actually ,98%) U.V. detection at 304 nm, μ-Bondapack C-18 (4 mm×30 cm); 10% CH3 CN in pH 7.4 phosphate buffer; flow rate 1 mLin; retention time: 5.37 min.
UV (pH 7.4) λmax : 304 (8260).
IR (Nujol) νmax : 1750 cm-1 (C=O β-lactam);
1 H NMR (200 MHz, D2 O) δ: 1.29 (d, CH3, JCH3,1' =6.4 Hz), 1.69-1.87 (m, 1H, CH2), 2.06-2.21 (m, 1H, CH2), 3.27 (dt, H-4, J=2.79, 10.83 Hz), 3.46 (dd, H-6, J5,6 =2.7 Hz, J6,1' =6.33 Hz), 3.89 (s, 2H, C H2 NH2), 4.04-4.38 (m, 6H, C H2 O, C HOH, H-5, SC H2), 7.36 (m, H-5, py, J4,5 =7.73 Hz, J5,6 =5.08 Hz), 7.5 (d, H-3, py, J3,4 =7.93 Hz), 7.85 (dt, H-4, py, J4,6 1.77 Hz, 8.45 (d, H-6 py).
(4R,5S,6S)-4-(2"-Aminoethyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(pyridin-3-yl)met hylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR146## A. Allyl (4R,5S,6S)-4-(2"-azidoethyl)-6-[(1'R)-1'-tert-butyldimethylsilyloxyethyl]- 3-[(pyridin-3-yl)methylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxyl ate ##STR147##
A solution of allyl (4R,5R,6S)-4-(2"-azidoethyl)-6-[(1'R)-1'-tert-butyldimethylsilyloxyethyl]- 3,7-dioxo-1-azabicyclo[3.2.0]-heptane-2-carboxylate (6.46 mmol, prepared from 3.0 g, 6.46 mmol of the diazo precursor of Example 2, Step E) in dry CH3 CN (50 mL) was treated at -15°C with diphenyl chlorophosphate (1.4 mL, 6.75 mmol) and N,N-diisopropylethylamine (1.2 mL, 6.9 mmol) added simultaneously over 5 min. A small crystal of 4-N,N-dimethylaminopyridine was then added and the mixture was slowly warmed up to 0°-5°C over 30 min. Then N,N-diisopropylethylamine (1.4 mL, 8.0 mmol) and 3-mercaptomethylpyridine (1.54 g, 12.3 mmol) in CH3 CN (5 mL) were added dropwise. After 1.5 h at 0°-5°C, the reaction mixture was quenched by addition of EtOAc and cold water. The organic phase was washed with 1M NaHSO3, saturated NaHCO3, brine and dried (MgSO4). Evaporation of the solvent gave an oil which was chromatographed on silica gel (5×11 cm). Elution with a gradient of EtOAc (0-20%) in toluene gave 2.13 g (60%) of the title compound as an oil.
IR (NaCl, film) νmax : 2100 (N3), 1775 (C═O of β-lactam) and 1710 cm-1 (C═O of ester);
1 H NMR (200 MHz, CDCl3) δ: 0.07 and 0.08 (2×s, 2×3H, SiCH3), 0.88 (s, 9H, Sit-Bu), 1.29 (d, J=6.12 Hz, 3H, CH3 CHO), 1.6-2.2 (m, 2H, CH2 -4), 3.06 (dd, JH6,H5 =2.70 Hz, JH6,H1 =7.74 Hz, 1H, H-6), 3.2-3.7 (m, H, CH2 N3 and H-4), 4.05 (dd overlapping with SCH2, JH5,H6 =2.70 Hz, JH5,H4 =9.54 Hz, 1H, H-5), 4.07 (ABq, JAB 15.6 Hz, Δν15.2 Hz, 1H, SCH2), 4.17 (m, 1H, CH3 C HO), 4.74 (m, 2H, CH2 of allyl), 5.2-5.5 and 5.8-6.1 (2×m, 2H and 1H, CH of allyl), 7.29 (m, 1H, H-5 of pyridine), 7.79 (m, 1H, H-4 of pyridine), 8.54 (dd, J=15.0 Hz and J=4.8 Hz, 1H, H-6 of pyridine) and 8.62 ppm (d, J=2.0 Hz, 1H, H-2 of pyridine).
B. Allyl (4R,5S,6S)-4-(2"-azidoethyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(pyridin-3-yl)me thylthio]-7-oxo-1-azabicyclo-[3.2.0]hept-2-ene-2-carboxylate ##STR148##
A solution of allyl (4R,5S,6S)-4-(2"-azidoethyl)-6-[(1'R)-1'-tert-butyldimethylsilyloxyethyl]- 3-[(pyridin-3-yl)methylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxyl ate (2.13 g, 3.92 mmol) in dry tetrahydrofuran (60 mL) was treated at 0°-5°C and under nitrogen with acetic acid (1.35 mL, 23.6 mmol) and 12.0 mL (12.0 mmol) of a 1M solution of tetrabutylammonium fluoride in tetrahydrofuran. After five days at 5°C, the reaction mixture was diluted with EtOAc, washed with cold saturated NaHCO3, brine and dried (MgSO4). Evaporation of the solvent gave an oil which was chromatographed on silica gel (4×12 cm) using a gradient of EtOAc (50 to 100%) in toluene as eluent. The first fractions gave 0.33 g (15%) of recovered starting material. The following fractions yielded 0.90 g (54%) of the title compound as a clear oil:
IR (NaCl, film) νmax : 2100 (N3), 1775 (C═O of β-lactam) and 1710 cm-1 (C═O of ester);
1 H NMR (200 MHz, CDCl3) δ: 1.38 (d, J=6.23 Hz, 3H, CH3 CHO), 1.6-2.2 (m, 2H,-CH2 -4), 3.12 (dd, JH6,H5 =2.77 Hz, JH6,H1 =7.89 Hz, 1H, H-6), 3.3-3.7 (m, 3H, CH2 N3 and H-4), 4.05 (ABq, JAB =13.4 Hz, Δν23.0 Hz, 2H, SCH2), 4.1-4.3 (m, 2H, H-5 and CH3 C HO overlapping), 4.75 (m, 2H, CH2 of allyl), 5.3-5.5 and 5.9-6.1 (2×m, 2H and 1H, CH of allyl), 7.3 (m, 1H, H-5 of pyridine), 7.72 (m, 1H, H-4 of pyridine), 8.53 (dd, J=1.58 Hz and J=4.8 Hz, 1H, H-6 of pyridine) and 8.6 ppm (d, J=2.0 Hz, 1H, H-2 of pyridine).
C. (4R, 5S,6S)-4-(2"-Aminoethyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(pyridin-3-yl)methyl thio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR149##
A solution of allyl (4R,5S,6S)-4-(2"-azidoethyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(pyridin-3-yl)me thylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate (0.90 g, 2.09 mmol) in dry CH2 Cl2 (50 mL) was treated at 0°-5° C. and under nitrogen with tetrakis(triphenylphosphine)palladium [0] (0.13 g) and 4.6 mL (2.3 mmol) of a 0.5M solution of potassium 2-ethylhexanoate in EtOAc. After 15 min, the reaction mixture was diluted with diethyl ether (150 mL) and extracted with 0.05M pH 7.0 phosphate buffer (3×75 mL). The combined aqueous phase was adjusted to pH 5.8 with 1M NaH2 PO4 and traces of organic solvent were removed in vacuo. The aqueous solution was then hydrogenated over 0.9 g of 30% palladium on Celite at 0°-5°C and under 45 psi for 1.2 h. The catalyst was then filtered and the filtrate was chromatographed on reversed phase silica gel (μ-Bondapak c-18, 3.5×6.5 cm). Elution with a gradient of CH3 CN (0-5%) in water gave the title material as a white amorphous powder after freeze drying. Crystallization in water (30 mL) gave 0.137 g of the title compound as a very fine solid. A second chromatography of the mother liquors gave 0.27 g (total yield 0.397 g, 52%) of the title compound as a white amorphous powder.
Purity by HPLC: 94.5% on μ-Bondapak c-18, 3.9 mm×30 cm, elution 8% CH3 CN-HO2 O pH 7.4 phosphate buffer, flow rate mLin, UV detector 300 nm, retention time 5.35 min;
UV (H2 O, pH 7.4 phosphate buffer) λmax : 268 (6,010) and 302 nm (7,740);
IR (KBr) νmax : 1770 (C═O of β-lactam) and 1590 cm-1 (C═O of carboxylate);
1 H NMR (200 MHz, D2 O) δ: 1.30 (d, J=6.29 Hz, 3H, CH3 CHO), 1.6-2.2 (m, 2H, CH2 -4), 3.04 (broad t, J=8.3 Hz, 2H, CH2 NH2), 3.20 (m, 1H, H-4), 3.38 (dd, JH6,H5 =2.72 Hz, JH6,H1 =6.45 Hz, 1H, H-6), 4.06 (ABq, JAB =13.6 Hz, Δν=24.3, 2H, SCH2), 4.1-4.3 (m, 2H, H-5 and CH3 C HO), 7.44 (m, 1H, H-5 of pyridine), 7.85 (d, J=7.8 Hz, 1H, H-4 of pyridine), 8.44 (d, J=4.9 Hz, 1H, H-6 of pyridine) and 8.50 ppm (broad s, 1H, H-2 of pyridine).
(4R,5S,6S)-4-(2"-N,N-Dimethylaminoethyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(pyri din-3-yl)methylthio]-7-oxo-1-azabicyclo[3.2.0]-hept-2-ene-2-carboxylic acid ##STR150##
A suspension of (4R,5S,6S)-4-(2"-aminoethyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(pyridin-3-yl)me thylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid from Example 24 (0.150 g, 0.41 mmol) in a mixture of water (3 mL) and acetonitrile (3 mL) was treated at 0°-5°C with 37% aqueous formaldehyde (0.23 mL, 2.4 mmol), sodium cyanoborohydride (0.048 g, 0.72 mmol) and two drops of acetic acid. After 20 min, the reaction mixture was diluted with 30 mL of 0.2M pH 6.0 phosphate buffer and the traces of organic solvent were removed in vacuo. The aqueous phase was chromatographed twice on reversed phase silica gel (μ-Bondapak c-18, 4×9 cm) using a gradient of acetonitrile (0-5%) in water as eluent. Lyophilization of the UV active fractions gave 0.080 g (∼50%) of a white amorphous powder. By HPLC, this product is a mixture of the title dimethylamino compound and N-methyl-N-cyanomethyl compound (Example 26) in a 3:1 ratio. Purification by preparative HPLC (μ-Bondapak c-18, 10 mm×30 cm, elution 5% CH3 CN-H2 O) gave 0.047 g (29%) of pure dimethylamino title compound.
Purity by HPLC: 97% on μ-Bondapak c-18, 3.9 mm×30 cm, elution 8% CH3 CN-H2 O pH 7.4 phosphate buffer, flow rate 1 mLin, retention time 5.42 min.;
UV (H2 O, pH 7.4 phosphate buffer) λmax : 268 nm (6592) and 302 nm (7,793);
IR (KBr) νmax : 1765 (C═O of β-lactam) and 1605 cm-1 (C═O of carboxylate);
1 H NMR (200 MHz, D2 O) δ: 1.30 (d, J=6.37 Hz, 3H, CH3 CHO), 1.5-2.2 (m, 2H, CH2 -4), 2.87 (s, 6H, N(CH3)2), 3.15 (m, 3H, CH2 N and H-4), 3.32 (dd, JH6,H5 =2.90 Hz, JH6,H1 =6.80 Hz, 1H, H-6), 4.05 (ABq, JAB =14.1 Hz, Δν=29.7 Hz, 2H, SCH2), 4.12 (dd, partially overlapping with SCH2, JH5,H6 =2.90 Hz, 1H, H-5), 4.22 (m, 1H, CH3 CHO), 7.44 (dd, J=5.0 Hz and J=7.9 Hz, 1H, H-5 of pyridine), 7.84 (m, 1H, H-4 of pyridine), 8.44 (dd, J=1.5 Hz, and J=5.0 Hz, 1H, H-6 of pyridine) and 8.50 ppm (d, J=1.8 Hz, 1H, H-2 of pyridine).
(4R,5S,6S)-4-[2"-(N-Cyanomethyl-N-methylamino)ethyl]-6-[(1'R)-1'-hydroxyeth yl]-3-[(pyridin-3-yl)methylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carb oxylic acid ##STR151##
The mixture of products obtained by the reductive alkylation of (4R,5S,6S)-4-(2"-aminoethyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(pyridin-3-yl)me thylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid as described in Example 25 was purified by preparative HPLC (μ-Bondapak c-18). The minor component of the mixture with a longer reaction time gave 0.011 g of the title compound as a white amorphous powder after lyophilization:
Purity by HPLC: 92% on μ-Bondapak c-18, 3.9 mm×30 cm, elution 8% CH3 CN-H2 O pH 7.4 phosphate buffer, flow rate 1 mLin, uv detector 302 nm, retention time 23.5 min.;
UV (H2 O, pH 7.4 phosphate buffer) λmax : 268 and 304 nm;
IR (KBr) νmax : 1752 (C═O of β-lactam) and 1605 cm-1 (C═O of carboxylate);
1 H NMR (200 MHz, D2 O) δ: 1.31 (d, J=6.36 Hz, 1H, CH3 CHO), 1.4 and 1.9 (2×m, 2×1H, CH2 -4), 2.35 (s, 3H, N-CH3), 2.3-2.6 (m, 2H, CH2 CH2 N), 3.12 (m, 1H, H-4), 3.33 (dd, JH6,H5 =2.68 Hz, JH6,H1 =5.95 Hz, 1H, H-6), 3.70 (s, 2H, N CH2 CN), 4.09 (ABq, JAB =14.14 Hz, Δν29.5 Hz, 2H, SCH2), 4.12 (dd overlapping with SCH2, JH5,H6 =2.68 Hz, 1H, H-5), 4.24 (m, 1H, CH3 CHO), 7.49 (m, 1H, H-5 of pyridine), 7.92 (d, J=8.0 Hz, 1H, H-4 of pyridine), 8.46 (broad d, J=4.3 Hz, 1H, H-6 of pyridine) and 8.54 ppm (broad s, 1H, H-2 of pyridine).
(4R,5S,6S)-4-(3"-Aminopropyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(2-hydroxyethyl) thio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR152##
A 0.04M pH 7.0 phosphate buffer solution (50 mL, 2.0 mmol) of sodium (4 R,5 S,6 S)-4-(3"-azidopropyl)-6-[(1' R)-1'-hydroxyethyl]-3-[(2-hydroxyethyl)thio]-7-oxo-1-azabicyclo-[3.2.0]hep t-2-en-2-carboxylate obtained from the corresponding allyl ester (404 mg, 1.02 mmol) as described in Example 21 was adjusted at 5°C to pH 5.8-5.9 with a 1.0M pH 4.2 NaH2 PO4 buffer solution. To this mixture was added 30% Pdelite (400 mg) and it was shaken on a Parr hydrogenator at 45-50 psi hydrogen for 1.5 h at an initial temperature of 5°C (ice bath) and final temperature of 15°C The catalyst was filtered off and the solution was passed through a μBondapak C18 reversed phase column (60 g, H2 O) to give impure title material contaminated with sodium (4 R,5 S,6 S)-4-(3"-hydroxypropyl)-6-[(1 R)-1'-hydroxyethyl]-3-[(2-hydroxyethyl)thio]-7-oxo-1-azabicyclo[3.2.0]hept -2-ene-2-carboxylate (Example 28). This contaminated material dissolved in a 0.01M pH 6.0 phosphate buffer was poured again on a μBondapak C18 column (ratio 500l). The first two volumes of the column were eluted with the pH 6.0 buffer and then elution with water gave 3-aminopropyl pure title compound (95 mg, 28%) and the 3-hydroxypropyl derivative (from 340 mg, 0.85 mmol of allyl ester, 45 mg, 17% as described in Example 28).
Purity of title compound by HPLC: 88% (KH2 PO4 0.01M, pH 7.4) retention time 5.54 min;
UV (H2 O ) νmax : 302 (9000);
IR (Nujol) νmax : 3600-3100 (OH), 1750 and 1585 cm-1 (C═O);
1 H NMR (D2 O, 200 MHz) δ: 4.33-4.2 (1H, m, H-1'), 4.23 (1H, dd, J=2.5 Hz, J=9.2 Hz, H-5), 3.82-3.67 (2H, m, CH2 O), 3.43-3.34 (1H, m H-4), 3.36 (1H, dd, J=2.5 Hz, J=6.6 Hz, H6), 3.09-3.02 (2H, m, CH2 N), 3.06-2.79 (2H, 2 sets of m, SCH2), 1.95-1.5 (4H, m, CH2 CH2) and 1.33 ppm (3H, d, J=6.4 Hz, CH3).
Sodium (4R,5S,6S)-4-(3"-hydroxypropyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(2-hydroxyeth yl)thio]-7-oxo-1-azabicyclo[3.2.0]-hept-2-ene-2-carboxylate ##STR153##
A 0.04M pH 7.0 phosphate buffer solution (50 mL, 2.0 mmol) of sodium (4 R,5 S,6 S)-4-(3"-azidopropyl)-6-[(1' R)-1'-hydroxyethyl]-3-[(2-hydroxyethyl)thio]-7-oxo-1-azabicyclo-[3.2.0]-he pt-2-ene-2-carboxylate obtained from the corresponding allyl ester as described in Example 21 (404 mg, 1.02 mmol) was adjusted at 5°C to pH 5.8-5.9 with a 1.0M pH 4.2 NaH2 PO4 buffer solution. To this mixture was added 30% Pdelite (400 mg) and it was shaken on a Parr hydrogenator at 45-50 psi hydrogen for 1.5 h at an initial temperature of 5°C (ice bath) and final temperature of 15°C The catalyst was filtered off and the solution was passed through a μBondapak C18 reversed phase column (60 g, H2 O) to give impure title material contaminated with (4 R,5 S,6 S)-4-(3"-aminopropyl)-6-[(1' R)-1'-hydroxyethyl]-3-[(2-hyroxyethyl)thio]-7-oxo-1-azabicyclo[3.2.0]hept- 2-ene-2-carboxylate (Example 27). This contaminated material dissolved in a 0.01M pH 6.0 phosphate buffer was poured again on a μBondapak C18 column (ratio 500l). The first two volume of the column were eluted with the pH 6.0 buffer and then elution with water gave 3-aminopropyl compound of Example 27 (95 mg, 28%) and the 3-hydroxypropyl title compound (from 340 mg, 0.85 mmol of allyl ester, 45 mg, 17%).
Purity of title compound by HPLC: 95.2% (KH2 PO4, 0.01M pH 7.4), retention time 7.9 min;
UV (H2 O) νmax : 302 (10,300);
IR (Nujol) νmax : 3600-3100 (OH), 1740 and 1690 cm-1 (C═O);
1 H NMR (D2 O, 200 MHz) δ: 4.35-4.2 (1H, m, H-1'), 4.23 (1H, dd, J=9.2 Hz, J=2.5 Hz, H-5), 3.77 (2H, m, SCH2 C H2 O), 3.65 (2H, m, CH2 O), 3.41 (1H, dd, J=2.5 Hz, J=6.1Hz, H-6), 3.42-3.36 (1H, m, H-4), 3.1-2.8 (2H, 2 sets of m, SCH2), 2.0-1.4 (4H, m, CH2 CH2) and 1.33 ppm (3H, d, J=6.4 Hz, CH3).
Sodium (4R,5S,6S)-4-(3"-azidopropyl)-6-[(1'R)-1'-hydroxyethyl]3-methylthio-7-oxo- 1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate ##STR154## A. Allyl (4R,5S,6S)-4-(3"-azidopropyl)-6-[(1'R)-1'-tert-butyldimethylsilyloxyethyl] -3-methylthio-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate ##STR155##
A solution of (3 S,4 R)-3-[(1' R)-1'- tert-butyldimethylsilyloxyethyl]-4-[(1" R)-1"-(3-azidopropyl)-3"-diazo-3"-allyl-oxycarbonyl-2"-oxypropyl]azetidin- 2-one prepared in Example 7, Step E (2.0 g, 4.2 mmol) and Rh(OAc)2 in benzene (80 mL) was heated under reflux for 20 min. Benzene was removed under vacuum and the resulting bicyclic ketone was diluted with CH3 CN (80 mL). It was cooled to -10°C (ice-MeOH bath) and treated dropwise with diphenyl chlorophosphate (1.0 mL, 4.6 mmol) and N,N-diisopropylethylamine (0.84 mL, 4.6 mmol) and 4-dimethylaminopyridine (2.3 mg). The mixture was stirred for 2 h then N,N-diisopropylethylamine (1.7 mL, 9.2 mmol) was added in, followed by the addition of a stream of CH3 SH gas (10 min). The mixture was kept at 5°C (cold room) for 18 h, then diluted with cold EtOAc (400 mL), washed with cold 1N aqueous HCl (400 mL), ice cold water (200 mL), 1M aqueous NaHCO3 (2×400 mL), ice cold water (3×400 m), brine and dried (MgSO4). The residue obtained (2 g) upon solvent evaporation was passed through a silica gel flash column (100 g, Hexane→20% EtOAcexane) to give the title compound (1.0 g, 50%) as an oil.
IR (CH2 Cl2) νmax : 2100 (N3), 1775 and 1710 cm-1 (C═O);
1 H NMR (CDCl3, 200 MHz) δ: 5.97-5.89 (1H, m, vinylic H), 5.48-5.21 (2H, m, vinylic H), 4.9-4.6 (2H, m, CH2 -vinyl), 4.3-4.15 (1H, m, H-1'), 4.12 (1H, dd, J=2.5 Hz, J=9.4 Hz, H-5), 3.5-3.3 (2H, m, CH2 N3), 3.3-3.1 (1H, m, H-4), 3.16 (1H, dd, J=7.4 Hz, J-2.7 Hz, H-6), 2.38 (3H, s, CH3), 1.9-1.5 (4H, m, CH2 CH2), 1.31 (3H, d, J=6.1 Hz, CH3), 0.88 (9H, s, tert-butyl), 0.086 and 0.078 ppm (6H, 2s, CH3).
B. Allyl (4R,5S,6S)-4-(3"-azidopropyl)-6-[(1'R)-1'-hydroxyethyl]-3-methylthio-7-oxo -1-azabicyclo[3.2.0]-hept-2-ene-2-carboxylate ##STR156##
A cold (-20°C) solution of allyl (4 R,5 S,6 S)-4-(3"-azidopropyl)-6-[(1' R)-1'- tert-butyldimethylsilyloxyethyl]-3-methylthio-7-oxo-1-azabicyclo[3.2.0]hep t-2-ene-2-carboxylate (1.0 g, 2.1 mmol) in THF (60 mL) was treated with glacial AcOH (1.5 mL, 25.2 mmol) and then with a 1M THF solution of tetrabutylammonium fluoride (12.7 mL, 12.6 mmol). The reaction was kept at 5°C for 100 h, then neutralized with a 1M aqueous NaHCO3 solution, diluted with EtOAc (200 mL), washed with cold 1M aqueous NaHCO3 solution (1×50 mL), water (2×150 mL), brine (1×150 mL) and dried (MgSO4). The residue (1.2 g) obtained upon solvent evaporation was passed through a silica gel flash column (1, Hexane/EtOAc→EtOAc) to give the title compound (0.30 g) and the starting ether (0.42 g) which was retreated again with tetrabutylammonium fluoride under the same conditions to give the title compound (0.13 g); combined yield 0.43 g, 56%.
IR (CH2 Cl2) νmax : 3600 (OH) 2100 (N3) 1775 and 1710 (C═O);
1 H NMR (CDCl3, 200 MHz) δ: 6.07-5.87 (1H, m, vinylic H), 5.5-5.21 (2H, m, vinylic-H), 4.87-4.62 (2H, m, CH2 -vinylic), 4.3-4.18 (1H, m, H-1'), 4.22 (1H, dd, J=2.6 Hz, J=9.3 Hz, H-5), 3.5-3.3 (2H, m, CH2 N3), 3.3-3.2 (1H, m, H-4), 3.23 (1H, dd, J=2.6 Hz, J=7.6 Hz, H-6), 2.37 (3H, s, SCH3), 1.9-1.55 (4H, m, CH2 CH2), 1.77 (1H, d, J=4.8 Hz, OH) and 1.39 ppm (3H, d, J=6.3 Hz, CH3).
C. Sodium (4R,5S,6S)-4-(3"-azidopropyl)-6-[(1'R)-1'-hydroxyethyl]-3-methylthio-7-oxo -1-azabicyclo[3.2.0]-hept-2-ene-2-carboxylate ##STR157##
A cold (ice bath) solution of allyl (4 R,5 S,6 S)-4-(3"-azidopropyl)-6-[(1' R)-1'-hydroxyethyl]-3-methylthio-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-car boxylate (50 mg, 0.14 mmol) in CH2 Cl2 (2 mL) was treated with Pd(PPh3)4 (5 mg) and a 0.5M solution of sodium 2-ethylhexanoate in EtOAc (0.3 mL, 0.15 mmol). The mixture was diluted with EtOAc (10 mL) and extracted with a 0.05M phosphate buffer solution (1×10 mL, 1×5 mL). The aqueous extracts were combined, washed with diethyl ether and passed through a μBondapak C18 reversed phase column (20 g, H2 O→2% CH3 CN2 O) to give the title compound (30 mg, 60%).
Purity by HPLC: 97.2% (10% CH3 CN/KH2 PO4 0.01M, pH 7.4), retention time 7.56 min;
UV (H2 O) νmax : 304 (8070);
IR (Nujol) νmax : 3600-3100 (OH), 2100 (N3), 1745 and 1595 cm-1 (C═O);
1 H NMR (D2 O, 200 MHz) δ: 4.34-4.2 (1H, m, H-1'), 4.22 (1H, dd, J=2.3 Hz, J=9.0 Hz, H-5), 3.47-3.37 (4H, m, H-6, H-4 and CH2 N3), 3.375 (d, J=2.3 Hz, part of dd of H-6), 2.37 (3H, s, CH3), 1.95-1.4 (4H, m, CH2 CH2) and 1.35 ppm (3H, d, J=6.4 Hz, CH3).
(4R,5S,6S)-4-(3"-Aminopropyl)-6-[(1'R)-1'-hydroxyethyl]-3-methylthio-7-oxo- 1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR158##
The pH of a cold (ice bath) 0.05M pH 7.0 sodium phosphate buffer (25 mL) of sodium (4 R,5 S,6 S)-4-(3"-azidopropyl)-6-[(1' R)-1'-hydroxyethyl]-3-methylthio-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-car boxylate made from the corresponding allyl ester (0.12 g, 0.33 mmol), as described in Example 29, was adjusted to 5.8 with a 1.OM pH 4.2 NaH2 PO4 buffer solution. The mixture was then shaken on a Parr hydrogenator at a hydrogen pressure of 45-50 p.s.i. for 90 min at ∼10°C (initial temperature: 5°C) using 30% Pdelite (120 mg) as catalyst. The catalyst was removed by filtration and the solution was passed through a μBondapak C18 reversed phase column (50 g, H2 O→2% CH3 CN/H2 O) to give a mixture of two compounds (0.3 g). This lyophilized powder was passed again on the reversed phase column (45 g, 150 mL of 0.05M pH 6.0 phosphate buffer, H2 O→2% CH3 CN/H2 O) to give impure 3-aminopropyl derivative (125 mg) and the 3-hydroxypropyl derivative of Example 31 (20 mg, 20%). The 3-aminopropyl derivative was repurified on the reversed phase column (45 g, H2 O→2% CH3 CN/H2 O) to give the pure title 3-aminopropyl compound (25 mg, 25%).
Purity by HPLC: 96.5% (KH2 PO4 buffer 0.01M, pH 7.4), retention time: 7.50 min;
UV (H2 O) λmax : 304 (8580);
IR (Nujol) νmax : 3600-3100 (OH, NH2), 1750 and 1580 (C═O);
1 H NMR (D2 O, 200 MHz) δ: 4.3-4.2 (1H, m, H-1'), 4.21 (1H, dd, J=2.4 Hz, J=9.1 Hz, H-5), 3.48-3.39 (1H, m, H-4), 3.33 (1H, dd, J=2.4 Hz, J=6.5 Hz, H-6), 3.15-3.0 (2H, m, CH2 N), 2.34 (3H, s, SCH3), 1.9-1.5 (4H, m, CH2 CH2) and 1.33 ppm (3H, d, J=6.4 Hz, CH3).
Sodium (4R,5S,6S)-6-[(1'R)-1'-hydroxyethyl]-4-(3"-hydroxypropyl)-3-methylthio-7-o xo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate ##STR159##
The pH of a cold (ice bath) 0.05M pH 7.0 sodium phosphate buffer (25 mL) of sodium (4 R,5 S,6 S)-4-(3"-azidopropyl)-6-[(1' R)-1'-hydroxyethyl]-3-methylthio-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-car boxylate made from the corresponding allyl ester (0.12 g, 0.33 mmol), as described in Example 29, was adjusted to pH 5.8 with a 1.0M pH 4.2 NaH2 PO4 buffer solution. The mixture was then shaken on a Parr hydrogenator at a hydrogen pressure of 45-50 p.s.i. for 90 min at ∼10°C (initial temperature: 5°C) using 30% Pdelite (120 mg) as catalyst. The catalyst was removed by filtration and the solution was passed through a μBondapak C18 reversed phase column (50 g, H2 O→2% CH3 CN/H2 O) to give the mixture of both title material (0.3 g). This lyophilized powder was passed again on the reversed phase column (45 g, 150 mL of 0.05M pH 6.0 phosphate buffer, H2 O→2% CH3 CN/H2 O) to give the impure 3-aminopropyl compound of Example 30 (125 mg) and the pure 3-hydroxypropyl title compound (20 mg, 20%).
Purity by HPLC: 97.5% (2% CH3 CN/pH 7.4 0.01M phosphate buffer), retention time: 7.79 min;
UV (H2 O) λmax : 306 (9700);
IR (Nujol) νmax : 3500-3100 (OH), 1740 and 1590 cm-1 (C═O);
1 H NMR (D2 O, 200 MHz) δ: 4.34-4.18 (1H, m, H-1'), 4.21 (1H, dd, J=2.4 Hz, J=9.3 Hz, H-5), 3.69-3.63 (2H, m, CH2 O), 3.46-3.36 (1H, m, H-4), 3.38 (1H, dd, J=2.4 Hz, J=6.3 Hz, H-6), 2.36 (3H, s, SCH3), 1.95-1.4 (4H, m, CH2 CH2) and 1.34 ppm (3H, d, J=6.4 Hz, CH3).
(4R,5S,6S)-4-[3"-(N-Formimidoyl)aminopropyl]-6-[(1'R)-1'-hydroxyethyl]-3-[( 2-hydroxyethyl)thio]-7-oxo-1-azabicyclo [3.2.0]hept-2-ene-2-carboxylic acid ##STR160##
To a cold (ice bath) solution of (4 R,5 S,6 S)-4-(3"-aminopropyl)-6-[(1' R)-1'-hydroxyethyl]-3-[(2-hydroxyethyl)thio]-7-oxo-1-azabicyclo[3.2.0]hept -2-ene-2-carboxylic acid (50 mg, 0.15 mmol) prepared in Example 27 in a 0.04M pH 7.0 phosphate buffer solution (10 mL, 0.4 mmol) was added a 0.1N aqueous NaOH solution in order to bring the pH to 8.2-8.4. To this solution was added portionwise benzylformimidate hydrochloride (257 mg, 1.5 mmol) while maintaining the pH at 8.0-8.5 with the 0.1N aqueous NaOH solution. The mixture was stirred for 10 min and then the pH was adjusted to 7.0 with 0.1N aqueous HCl. The solution was passed through a μ-Bondapak C18 column (25 g, H2 O→2%, 4% CH3 CN2 O) to give the pure title compound (33 mg, 62%) as a lyophilized powder.
Purity by HPLC: 93.8% (2% CH3 CN/KH2 HPO4 0.01M, pH 7.4), retention time: 5.73 min;
UV (H2 O) λmax : 302 (7651);
IR (Nujol) νmax : 3600-3100 (NH,OH), 1755, 1585 (C═O) and 1710 cm-1 (C═NH);
1 H NMR (D2 O, 200 MHz) δ: 7.83, 7.80 (1H, 2s, NCHN), 4.35-4.2 (1.5H, m, H-1'), 4.21 (0.5H, d, J=2.2 Hz, part of H-5), 3.8-3.7 (2H, m, CH2 O), 3.55-3.25 (4H, m, CH2 N, H-6, H-4), 3.1-2.8 (2H, 2 sets of m, SCH2), 1.95-1.4 (4H, m, CH2 CH2) and 1.32 ppm (3H, d, J=6.3 Hz, CH3).
(4R,5S,6S)-4-[3"-(N-Formimidoyl)aminopropyl]-6-[(1'R)-1'-hydroxyethyl]-3-me thylthio-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR161##
The pH of a cold (ice bath) solution of (4 R,5 S,6 S)-4-(3"-aminopropyl)-6-[(1' R)-1'-hydroxyethyl]-3-methylthio-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-car boxylic acid (31 mg, 0.10 mmol) prepared in Example 30 in a 0.05M pH 7.0 phosphate buffer was adjusted to 8.5 with a 0.1N aqueous NaOH solution. To the mixture was added portionwise benzyl formimidate hydrochloride (172 mg, 1 mmol), the pH being kept at 8-8.3 with the 0.1N aqueous NaOH solution, and it was stirred for 15 min. The pH of the mixture was then adjusted to 7.0 and the aqueous solution was passed through μBondapak C18 column (15 g, H2 O) to give title compound (22 mg, 60%) as a lyophilized powder;
Purity by HPLC: 97.8% (304 nm, 2% CH3 CNH2 P4 0.01M pH 7.4) retention time 8.33 min;
UV (H2 O) λmax : 306 (12,200);
IR (Nujol) νmax : 3600-3100 (OH, NH2), 1750, 1590 (C═O) and 1710 cm-1 (C═N);
1 H NMR (D2 O; 200 MHz) δ: 7.83, 7.80 (1H, 2s, CH), 4.35-4.18 (2H, m, H-1' and H-5), 3.45-3.35 (3H, m, CH2 N, H-4), 3.30 (1H, dd, J=2.4 Hz, J=6.2 Hz, H-6), 2.34 (3H, s SCH3), 1.9-1.45 (4H, m, CH2 CH2) and 1.32 ppm (3H, d, J=6.4 Hz, CH3).
(4R,5S,6S)-4-[3"-(N-Guanidinyl)aminopropyl]-6-[(1'R)-1'-hydroxyethyl]-3-met hylthio-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR162##
The pH of a cold (ice bath) solution of (4 R,5 S,6 S)-4-(3"-aminopropyl)-6-[(1' R)-1'-hydroxyethyl]-3-methylthio-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-car boxylic acid (50 mg, 0.17 mmol) prepared in Example 30 in a 0.05M pH 7.0 phosphate buffer was adjusted to pH 8 with a 0.1N aqueous NaOH solution. To this mixture was added portionwise aminoiminomethanesulfonic acid (211 mg, 1.70 mmol); the pH of the reaction mixture being kept at 7.8-8.0 with the 0.1N aqueous NaOH solution. It was then stirred for 1 h and the pH of the mixture was adjusted to 7.0 with a 0.1N aqueous HCl solution. It was passed through a μBondapak C18 reversed phase column (25 g, H2 O) to give the title compound (17 mg, 40%) as a lyophilized powder.
Purity by HPLC: 99.4% (304 nm, 2% CH3 CNH2 PO4 0.01M pH 7.4), retention time 9.19 min;
UV (H2 O) λmax : 306 (10,700);
IR (Nujol) λmax : 3600-3100 (NH2 OH) 1750, 1680 (C═O) and 1660 cm-1 (C═N);
1 H NMR (D2 O, 200 MHz) δ: 4.3-4.17 (1H, m, H-1'), 4.20 (1H, dd, J=2.4 Hz, J=9.1 Hz, H-5), 3.46-3.30 (1H, m, H-4), 3.26 (1H, dd, J=2.5 Hz, J=6.3 Hz, H-6), 3.3-3.2 (2H, m, CH2 N), 2.34 (3H, s, SCH3), 1.9-1.4 (4H, m, CH2 CH2) and 1.32 ppm (3H, d, J=6.3 Hz, CH3).
(4R,5S,6S)-4-[3"-(N-Guanidinyl)aminopropyl]-6-[(1'R)-1'-hydroxyethyl]-3-[(2 -hydroxyethyl)thio]-7-oxo-1-azabicyclo-[3.2.0]hept-2-ene-2-carboxylic acid ##STR163##
To a cold (ice bath) solution of (4 R,5 S,6 S)-4-(3"-aminopropyl)-6-[(1' R)-1'-hydroxyethyl]-3-[(2-hydroxyethyl)thio]-7-oxo-1-azabicyclo[3.2.0]hept -2-ene-2-carboxylic acid (50 mg, 0.15 mmol) prepared in Example 27 in a 0.04M pH 7.0 aqueous phosphate buffer (10 mL, 0.4 mmol) was added a 0.1N aqueous NaOH solution in order to bring the pH7 to 7.8-8∅ To this solution was added portionwise aminoiminomethanesulfonic acid (186 mg, 1.5 mmol) as described by H. S. Mosher et al. Tet. Lett. 29 (26) 3183-86(1988) and the pH was kept between 7.6-7.8. The mixture was stirred for 1 h while maintaining a constant pH (7.6-7.8) with a 0.1N aqueous NaOH solution. The pH of the reaction mixture was adjusted to 7.08 with a 0.1N aqueous HCl solution and then passed through a μ-Bondapak C18 reversed phase column (25 g, H2 O, 2%, 4% CH3 CN2 O) to give the title compound (35 mg, 63%) as a lyophilized powder;
Purity by HPLC: 99.1% (2% CH3 CN/buffer pH 7.4, 0.01M), retention time 7.5 min;
UV (H2 O) λmax : 304 (7800);
IR (Nujol) νmax : 3320, 3180 (NH, OH), 1750, 1580 (C═O) and 1665 cm-1 (C═N);
1 H NMR (D2 O, 200 MHz) δ: 4.3-4.2 (2H, m, H-1' and H-5), 3.77 (2H, t, J=6.2 Hz, CH2 O), 3.28 (1H, dd, J=2.4 Hz, J=6.2 Hz, H-6), 3.45-3.15 (3H, m, H-4 and CH2 N), 3.15-2.8 (2H, 2 sets of m, SCH2), 2.0-1.45 (4H, m, CH2 CH2) and 1.32 (3H, d, J=6.3 Hz, CH3).
4R,5S,6S)-4-(2"-Aminoethyl)-3-[(2-cyanoethyl)thio]-6-[(1'R)-1'-hydroxyethyl ]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR164## A. Allyl (4R,5R,6S)-4-(2"-azidoethyl)-6-[(1'R)-1'-tert-butyldimethylsilyloxyethyl]- 3-[(2-cyanoethyl)thio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate ##STR165##
A solution of allyl (4R,5R,6S)-4-(2"-azidoethyl)-6-[(1'R)-1'-tert-butyldimethylsilyloxyethyl]- 3,7-dioxo-1-azabicyclo[3.2.0]heptane-2-carboxylate (6.46 mmol, prepared by cyclization of the diazo precursor (3.0 g, 6.46 mmol) prepared in Example 2, Step E) in dry acetonitrile (50 mL) was treated at -15°C and under nitrogen with diphenyl chlorophosphate (1.4 mL, 6.75 mmol) and N,N-diisopropylethylamine (1.2 mL, 6.9 mmol) added simultaneously over 5 min. A small crystal of 4-N,N-dimethylaminopyridine was then added and the temperature of the mixture was slowly warmed up to 0°-5°C over 30 min. Then, N,N-diisopropylethylamine (1.2 mL, 6.9 mmol) and β-mercaptopropionitrile (1.13 g, 13.0 mmol) as described by L. Bauer and T. L. Welsh, J. Org. Chem., 26, 1443 (1961) were added and the mixture was stirred at 0°-5°C for 2 h. The reaction mixture was then diluted with EtOAc (300 mL), washed with water, 1M NaHSO3, saturated NaHCO3, brine and dried (MgSO4). Evaporation of the solvent gave an oil which was chromatographed on silica gel (5×11 cm). Elution with a gradient of EtOAc (0-10%) in toluene gave 3.3 g (∼100%) of the title compound as a brown oil contaminated by some polymeric material. This material was used as such for the next step.
IR (NaCl, film) νmax : 2250 (CN), 2100 (N3), 1775 (C═O of β-lactam) and 1710 cm-1 (C═O of ester);
1 H NMR (200 MHz, CDCl3) δ: 0.19 (s, 6H, SiCH3), 0.99 (s, 9H, Sit-Bu) 1.41 (d, J=6.11 Hz, 3H, CH3 CHO), 1.7-2.2 (m, 2H, CH2 -4), 2.7-3.4 (m, 5H, SC H2 C H2 CN and H-6), 3.4-3.8 (m, 3H, CH2 N3 and H-4), 4.3 (m, 2H, H-5 and CH3 C HO), 4.85 (m, 2H, CH2 of allyl), 5.3-5.6 and 5.9-6.2 ppm (2×m, 2H and 1H, CH of allyl).
B. Allyl (4R,5S,6S)-4-(2"-azidoethyl)-3-[(2-cyanoethyl)thio]-6-[(1'R)-1'-hydroxyeth yl]-7-oxo-1-azabicyclo-[3.2.0]hept-2-ene-2-carboxylate ##STR166##
A solution of crude allyl (4R,5S,6S)-4-(2"-azidoethyl)-6-[(1'R)-1'-tert-butyldimethyldimethylsilylox yethyl]-3-[(2-cyanoethyl)thio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carbox ylate (3.3 g, 6.4 mmol) from Step A in dry tetrahydrofuran (100 mL) was treated at 0°-5°C and under nitrogen with acetic acid (2.2 mL, 38.4 mmol) followed by 20 mL (20.0 mmol) of 1M solution of tetrabutylammonium fluoride in tetrahydrofuran. The solution was stored at 5°C for 8 days. The reaction mixture was then diluted with EtOAc, washed with saturated NaHCO3, brine and dried (MgSO4). Evaporation of the solvent gave an oil which was chromatographed on silica gel (5×11 cm). Elution with a mixture of toluene and EtOAc (1:1) gave 0.92 g (36%, yield from the diazoazetidinone) of the title compound as a clear oil.
IR (NaCl, film) νmax : 3500 (OH), 2250 (CN), 2105 (N3), 1775 (C═O of β-lactam) and 1710 cm-1 (C═O of carboxylate);
1 H NMR (200 MHz, CDCl3) δ: 1.40 (d, J=6.23 Hz, 3H, CH3 CHO), 1.6-2.1 (m, 2H, CH2 -4), 2.7 (m, 2H, CH2 CN), 2.9-3.3 (m, 3H, H-6 and SCH2), 3.4-3.7 (m, 3H, H-4 and CH2 N3), 4.25 (m overlapping with H-5, 1H, CH3 CHO), 4.29 (dd, JH5,H6 =2.80 Hz, JH5,H4 =9.69 Hz, 1H, H-5), 4.77 (m, 2H, CH2 of allyl), 5.2-5.5 and 5.9-6.1 ppm (2×m, 2H and 1H, CH of allyl).
C. (4R,5S,6S)-4-(2"-Aminoethyl)-3-[(2-cyanoethyl)thio]-6-[(1'R)-1'-hydroxyeth yl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR167##
A solution of allyl (4R,5S,6S)-4-(2"-azidoethyl)-3-[(2-cyanoethyl)thio]-6-[(1'R)-1'-hydroxyeth yl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate (0.92 g, 2.35 mmol) in dry CH2 Cl2 (50 mL) was treated at 0°-5°C and under nitrogen, with tetrakis (triphenylphosphine)palladium[0] (0.13 g) and 5.2 mL (2.6 mmol) of a 0.5M solution of potassium 2-ethylhexanoate in EtOAc. Then 200 mL of 0.1M pH 6.0 phosphate buffer were added and the organic solvent was evaporated under reduced pressure. The residual aqueous phase was hydrogenated at 0°-5°C over 2.0 g of 5% palladium on barium sulfate and under 45 psi of hydrogen for 30 min. The catalyst was filtered and the filtrate was concentrated by half under vacuum. After two chromatographies on reversed phase silica gel (μ-Bondapak c-18, 7.5×10.5 cm) using water as eluent, lyophylization of the UV active fractions gave 0.15 g (20%) of the title compound as a white amorphous powder;
Purity by HPLC: 99% on μ-Bondapak c-18, 3.9 mm×30 cm, elution H2 O pH 7.4 phosphate buffer, flow rate 1 mLin, UV detector 304 nm, retention time 4.67 min;
UV (H2 O, pH 7.4 phosphate buffer) λmax : 298 nm (7,709);
IR (KBr) νmax : 2250 (CN), 1760 (C═O of β-lactam) and 1590 cm-1 (C═O of carboxylate);
1 H NMR (200 MHz, D2 O) δ: 1.33 (d, J=6.35 Hz, 3H, CH3 CHO), 1.8-2.4 (m, 2H, CH2 -4), 2.85 (m, 2H, CH2 CN), 2.9-3.3 (m, 4H, SCH2 and CH2 NH2), 3.45 (m, overlapping with H-6, 1H, H-4), 3.47 (dd, JH6,H5 =2.90 Hz, JH6,H1 =6.47 Hz, 1H, H-6), and 4.2-4.4 ppm (m, 2H, H-5 and CH3 CHO).
Sodium (4R,5S,6S)-6-[(1'R)-1'-hydroxyethyl]-4-[2"-(2,5-dioxo-1-pyrrolidinyloxy)et hyl]-3-[(pyridin-2-yl)methylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-car boxylate ##STR168## A. Allyl (4R,5S,6S)-6-[(1'R)-1'-(tert-butyldimethylsilyloxyethyl)]-4-[2"-(2,5-dioxo -1-pyrrolidinyloxy)ethyl]-3-[(pyridin-2-yl)methylthio]-7-oxo-1-azabicyclo[3 .2.0]hept-2-ene-2-carboxylate ##STR169##
To a mixture of allyl (4R,5S,6S)-6-[(1'R)-1'-(tert-butyldimethylsilyloxyethyl)]-4-(2"-hydroxyeth yl)-3-[(pyridin-2-yl)methylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carb oxylate (0.29 g, 0.56 mmol), prepared in Example 6, Step A, N-hydroxysuccinimide (0.07 g, 0.62 mmol) and triphenylphosphine (0.176 g, 0.67 mmol) in dry THF (8 mL) at 0°C, under Argon, was added diethyl azodicarboxylate (0.117 g, 0.67 mmol). The reaction mixture was stirred at 0°C for 1 hour and at room temperature for an additional hour. The solvent was removed under reduced pressure and the residue was chromatographed on silica (3×9 cm) packed in CH2 Cl2 and eluted with a mixture of CH2 Cl2 and EtOAc (4:6, gradient elution) to give the title compound mixed with about one equivalent of Ph3 P═O (0.465 g).
1 H NMR (200 MHz, CDCl3 7.24) δ: 0.04 (s, 6H, Si(CH3)2), 0.84 (s, 9H, SiC(CH3)3), 1.23 (d, CH3, JCH3,1'= 6.07 Hz), 1.73-1.95 (m, 1H, CH2), 2.19-2.33 (m, 1H, CH2), 2.67 (s, 4H, O═C(CH2)2 C═O), 3.14 (dd, H-6, J5,6 =2.56 Hz, J6,1' =6.4 Hz), 3.81 (m, H-4), 3.96-4.33 (overlapping, 6H, CH2 O, CHOH, H-5, SCH2), 4.59-4.81 (m, OCH2, allyl), 5.17-5.44 (m, ═CH2, allyl), 5.82-5.98 (m, CH═, allyl), 7.16 (m, H-5, py, J4,5 =7.47 Hz, J5,6 =4.91 Hz), 8.49 (d, H-6, py).
B. Allyl (4R,5S,6S)-6-[(1'R)-1'-hydroxyethyl]-4-[2"-(2,5-dioxo-1-pyrrolidinyloxy)et hyl]-3-[(pyridin-2-yl)methylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-car boxylate ##STR170##
A cold (0°C) solution of allyl (4R,5S,6S)-6-[(1'R)-1'-(tert-butyldimethylsilyloxyethyl)]-4-[2"-(2,5-dioxo -1-pyrroli-dinyloxy)ethyl]-3-[(pyridin-2-yl)methylthio]-7-oxo-1-azabicyclo[ 3.2.0]-hept-2-ene-2-carboxylate (0.46 g, 0.75 mmol) from Step A in dry THF (8 mL) was treated, under Argon, with acetic acid (0.26 mL, 4.48 mmol) followed by a 1M solution of tetrabutylammonium fluoride in THF (2.24 mL, 2.24 mmol). The mixture was stirred between 0° and 5°C for 120 h and then neutralized at 0°C with a 1M NaHCO3 solution (4.52 mL, 4.48 mmol). The mixture was extracted with EtOAc (3×50 mL) and the combined organic phase was washed successively with a cold 1M NaHCO3 solution, water and brine, dried (MgSO4) and solvent evaporated to give a sticky gum which was chromatographed on silica (3.5×9 cm) packed in CH2 Cl2 and eluted first with a mixture of CH2 Cl2 and EtOAc (50 to 100% EtOAc) and then with a mixture of CH3 CN and EtOAc (1:1 gradient elution) to give the title compound as a foam (0.18 g, 64.3%);
1 H NMR (200 MHz, CDCl3 7.24) δ: 1.37 (d, CH3, JCH3,1' =6.25 Hz), 1.71-1.9 (m, 1H, CH2), 2.31-2.44 (m, 1H, CH2), 2.7 (s, 4H, O═C(CH2)2 C═O), 3.25 (dd, H-6, J5,6 =2.73 Hz, J6,1' 8.77 Hz), 3.91 (m, H-4), 3.85-4.30 (overlapping, 6H, CH2 O, CHOH, H-5, SCH2), 4.58-4.86 (m, OCH2, allyl), 5.19-5.46 (m, CH2, allyl), 5.84-6.03 (m, CH═, allyl), 7.16 (m, H-5, py, J3,5 =0.93 Hz, J4,5 =7.67 Hz, J5,6 =4.04 Hz), 7.34 (m, H-3, py, J3,4 =7.8 Hz), 7.64 (m, H-4, py, J4,6 =1.82 Hz), 8.48 (m, H-6, py).
C. Sodium (4R,5S,6S)-6-[(1'R)-1'-hydroxyethyl]-4-[2"-(2,5-dioxo-1-pyrrolidinyloxy)et hyl]-3-[(pyridin-2-yl)methylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-car boxylate ##STR171##
To a cold (0°C) solution of allyl (4R,5S,6S)-6-[(1'R)-1'-hydroxyethyl]-4-[2"-(2,5-dioxo-1-pyrrolidinyloxy)et hyl]-3-[(pyridin-2-yl)methylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-car boxylate (0.16 g, 0.32 mmol) in CH2 Cl2 (10 mL), under Argon, was added Pd[Ph3 P]4 (0.055 g, 0.048 mmol) followed by a 0.5M solution of sodium 2-ethylhexanoate in EtOAc (0.64 mL, 0.32 mmol). The mixture was stirred at 0°C for 2 h and then extracted with water (3×15 mL). The combined aqueous phase was passed through a column of μ-Bondapak C-18 reverse phase silica (3×11 cm). The title compound was eluted with a mixture of water and CH3 CN (9:1, gradient elution) and was obtained as a white fluffy solid after lyophilization (0.1 g, 64.9%);
Purity by HPLC: 97.6%; UV detection at 304 nm on μ-Bondapak C-18 (4 mm×30 cm), 8% CH3 CN in pH 7.4 phosphate buffer, flow rate 1 mLin, retention time 9.7 min;
IR (nujol) νmax : 1750 cm-1 (C═O, β-lactam), 1720 cm-1 (amide C═O).
UV (pH 7.4) λmax : 304 (7756).
1 H NNR (200 MHz, D2 O) δ: 1.25 (d, CH3, JCH3,1' =6.39 Hz), 1.75-1.91 (m, 1H, CH2), 2.11-2.25 (m, 1H, CH2), 2.82 (s, 4H, O═C(CH2)2 C═O), 3.41-3.52 (overlapping, 2H, H-4, H-6), 3.98-4.30 (overlapping, 6H, CH2 O, CHOH, H-5, SCH2), 7.41 (dd, H-5, py, J3,4 =7.9 Hz), 7.91 (dt, H-4, py, J4,6 =1.68 Hz), 8.48 (d, H-6, py).
(4R,5S,6S)-4-(2"-Aminoethyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(1,2,3-thiadiazol -4-yl)methylthio]-7-oxo-1-azabicyclo-[3.2.0]hept-2-ene-2-carboxylic acid ##STR172## A. Allyl (4R,5S,6S)-4-(2"-azidoethyl)-6-[(1'R)-1'-tert-butyldimethylsilyloxyethyl]- 3-[(1,2,3-thiadiazol-4-yl)methylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2 -carboxylate ##STR173##
A solution of (3 S,4 R)-3-[(1' R)-1'- tert-butyldimethylsilyloxyethyl]-4-[(1" R)-1"-(2-azidoethyl)-3"-diazo-3"-allyloxycarbonyl-2"-oxopropyl]azetidin-2- one (3.7 g, 8.0 mmol prepared as in Example 2, Step E) and Rh(OAc)2 (150 mg) in hot benzene (300 mL) was heated under reflux for 1 h. Filtration and evaporation of benzene gave the crude allyl (4 R,5 S,6 S)-4-(2"-azidoethyl)-6-[(1' R)-1'- tert-butyldimethylsilyloxyethyl]-3,7-dioxo-1-azabicyclo[3.2.0]heptan-2-car boxylate which was dissolved in CH3 CN (75 mL), cooled to -15° C. (ice-MeOH bath) and treated dropwise with diphenyl chlorophosphate (1.76 mL, 8.80 mmol) and N,N-diisopropylethylamine (1.54 mL, 8.8 mmol). The mixture was stirred for 1 h and the resulting enol phosphate was treated dropwise with 1,2,3-thiadiazol-4-methyl mercaptan (1.16 g, 8.8 mmol) in CH3 CN (1.5 mL) and N,N-diisopropylethylamine (1.54 mL, 8.8 mmol). The reaction mixture was stirred for 1 h and more mercaptan (160 mg, 1.2 mmol) and N,N-diisopropylethylamine (0.20 mL, 1.2 mmol) were added. The mixture was stirred for 1 h, diluted with cold EtOAc (200 mL), washed with cold water (25 mL), 1M aqueous NaHSO3 (3×25 mL), H2 O (25 mL), 1N aqueous HCl (25 mL), 1M aqueous NaHCO3 (25 mL), brine (25 mL) and dried (MgSO4). The residue was passed through a silica gel flash pad (125 g, hexane→5%→25% EtOAcexane) to give the title compound (2.38 g, 61.5%) and some enol phosphate (640 mg, 0.96 mmol);
IR (CH2 Cl2) νmax : 2100 (N3), 1775 and 1710 cm-1 (C═O);
1 H NMR (CDCl3, 200 MHz) δ: 8.44 (1H, s, aromatic-H), 6.00-5.83 (1H, m, vinylic-H), 5.46-5.20 (2H, m, vinylic --H), 4.82-4.60 (2H, allylic CH2), 4.774, 4.701, 3.397, 4.324 (2H, ABq, J=14.6 Hz, CH2), 4.25-4.13 (1H, m, H-1'), 4.113 (1H, dd, J=2.7 Hz, J=9.6 Hz, H-5), 3.69-3.55 (2H, m, CH2 --N3), 3.46-3.32 (1H, m, H-4), 3.094 (1H, dd, J=2.7 Hz, J=7.4 Hz, H-6), 2.16-1.98, 1.78-1.65 (2H, 2 sets of m, CH2 -4), 1.291 (3H, d, J=6.1 Hz, CH3), 0.882 (9H, s, tert-butyl) and 0.080 ppm (6H, s, dimethyl).
B. Allyl (4R,5S,6S)-4-(2"-azidoethyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(1,2,3-thiadiazo l-4-yl)methylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate ##STR174##
A cold (ice-MeOH bath) solution of allyl (4 R,5 S,6 S)-4-(2"-azidoethyl)-6-[(1' R)-1'-tert-butyldimethylsilyloxyethyl]-3-[(1,2,3-thiadiazol-4-yl)methylthi o]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate (2.38 g, 4.30 mmol) in anhydrous THF (40 mL) was treated with acetic acid (1.49 mL, 25.8 mmol) and dropwise with a 1M solution of tetrabutylammonium fluoride in THF (12.9 mL, 12.9 mmol). The mixture was then stirred for 48 h at 5° C. It was diluted with EtOAc (150 mL) and washed with water (2×25 mL), 1M aqueous NaHCO3 (2×25 mL), water (1×25 mL), brine (25 mL) and dried (MgSO4). The residue was passed through a silica gel flash column (50 g, CH2 Cl2 hexane: 1→EtOAc/CH2 Cl2 : 5→60%) to give the title compound (814 mg, 43%) as an oil;
IR (CH2 Cl2) νmax : 3600 (OH), 2100 (N3), 1780 and 1710 cm-1 (C═O);
1 H NMR (CDCl3, 200 MHz) δ: 8.46 (1H, s, aromatic --H), 6.04-5.84 (1H, m, vinylic --H), 5.47-5.21 (2H, m, vinylic-H), 4.87-4.59 (2H, m, allylic H), 4.799, 4.725, 4.353, 4.278 (2H, ABq, J=15.0 Hz, CH2 -aromatic), 4.216 (1H, dd, J=2.8 Hz, J=6.7 Hz, H-5), 4.72-4.18 (1H, m, H-1'), 3.79-3.67 (1H, m, H-4), 3.66-2.56, 3.52-3.38 (2H, 2 sets of m, CH2 --N3), 3.176 (1H, dd, J=2.8 Hz, J=7.9 Hz, H6), 2.20-2.03, 1.88-1.67 (2H, 2 sets of m, CH2 -4), 1.874 (1H, d, J=4.3 Hz, OH) and 1.495 ppm (3H, d, J=6.5 Hz, CH3).
C. (4R,5S,6S)-4-(2"-Aminoethyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(1,2,3-thiadiazo l-4-yl)methylthio)]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR175##
A cold (ice bath) solution of allyl (4 R,5 S,6 S)-4-(2"-azidoethyl)-6-[(1' R)-1'-hydroxyethyl]-3-[(1,2,3-thiadiazol-4-yl)methylthio]-7-oxo-1-azabicyc lo[3.2.0]hept-2-ene-2-carboxylate (465 mg, 1.07 mmol) in CH2 Cl2 (50 mL) was treated with Pd(PPh3)4 (22 mg) and a 0.5M solution of sodium ethyl-2-hexanoate (2.14 mL, 1.07 mmol) in EtOAc. The mixture was stirred for 1 h, diluted with diethyl ether (20 mL) and extracted with a 0.04M aqueous pH 7.0 phosphate buffer (4×5 mL). The aqueous extracts were washed with diethyl ether (2×20 mL) and the pH was adjusted to 5.9. The aqueous solution was then shaken in a Parr hydrogenator at 45-50 psi hydrogen for 1 h at 5°→15°C (at the end of the reaction) using 30% Pdelite (465 mg) as catalyst. The catalyst was removed by filtration and washed with water (2×5 mL). The aqueous layer was passed through a μ-Bondapak C18 reversed phase column (100 g, H2 O→1%→3% CH3 CN/H2 O) to give the title compound (163 mg, 41%) as a lyophilized powder;
Purity: 97.9% by HPLC (300 nm);
UV (H2 O) λmax : 300 (ε9240);
IR (Nujol) δ: 1770 and 1580 cm-1 (C═O);
1 H NMR (D2 O, 200 MHz) δ: 8.87 (1H, s, aromatic H), 4.73, 4.67, 4.43, 4.35 (2H, ABq, J=14.0 Hz, CH2 -aromatic), 4.31-4.18 (1H, m, H-1'), 4.157 (1H, dd, J=2.8 Hz, J=9.7 Hz, H-5), 3.417 (1H, dd, J=2.8 Hz, J=6.5 Hz, H-6), 3.38-3.26 (1H, m, H-4), 3.17-3.02 (2H, m, CH2 --N), 2.25-2.07, 1.86-1.65 (2H, 2 sets of m, CH2 -4), and 1.306 ppm (3H, d, J=6.4 Hz, CH3).
(4R,5S,6S)-4-(2"-Aminoethyl)-6-[(1'R)-1'-hydroxyethyl]-3-methylthio-7-oxo-1 -azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR176## A. Allyl (4R,5S,6S)-4-(2"-azidoethyl)-6-[(1'R)-1'-hydroxyethyl]-3-methylthio-7-oxo- 1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate ##STR177##
A cold solution (ice-MeOH bath) of allyl (4 R,5 S,6 S)-4-(2"-azidoethyl)-6-[(1' R)-1'-hydroxyethyl]-3,7-dioxo-1-azabicyclo[3.2.0]heptan-2-carboxylate [from (3 S,4 R)-3-[(1' R)-1'-hydroxyethyl]-4-[(1 R)-1"-(2-azidoethyl)-3"-diazo-3"-allyloxy- carbonyl-2"-oxopropyl]azetidin-2-one (2.55 g, 7.00 mmol) as described in Example 38, Step A] in CH3 CN (100 mL) was treated with diphenyl chlorophosphate (1.63 mL, 7.70 mmol), N,N-diisopropylethylamine (1.40 mml, 7.7 mmol) and 4-dimethylaminopyridine (26 mg). The mixture was stirred for 1 h and the resulting enol phosphate was treated with trimethylsilyl chloride (1.0 mL, 7.7 mmol) and N,N-diisopropylethylamine (1.4 mL, 7.7 mmol). The mixture was stirred (15 min) and N,N-diisopropylethylamine (2.8 mL, 15 mmol) was added followed by the addition of a stream of CH3 SH gas for 10 min. The mixture was allowed to react at 5°C for 44 h, then diluted with EtOAc (300 mL), washed with an ice cold 1M aqueous NaHCO3 (3×50 mL) solution, ice cold water (3×50 mL), brine (50 mL) and dried (MgSO4). The residue (3 g) was diluted with THF (100 mL), treated with 2N aqueous AcOH (17.5 mL, 35 mmol) and stirred for 1 h at 22°C The mixture was diluted with EtOAc (300 mL), washed with 1M aqueous NaHCO3 (2×100 mL), H2 O (3×100 mL), brine (100 mL) and dried (MgSO4). The residue (1.5 g) was passed through a silica gel pad (75 g, hexanetOAc: 1/1→EtOAc) to give the title compound (530 mg, 21%) as an oil;
IR (neat) νmax : 3600-3200 (OH) 2100 (N3) 1770 and 1705 cm-1 (C═O);
1 H NMR (CDCl3, 200 MHz) δ: 6.07-5.87 (1H, m, vinylic H), 5.49-5.22 (2H, m, vinylic --H), 4.88-4.63 (2H, m, allylic CH2), 4.30-4.19 (1H, m, H-1'), 4.227 (1H, dd, J=2.6 Hz, J=9.4 Hz, H-5), 3.66-3.54 (1H, m, H-4), 3.49-3.34 (2H, m, CH2 N), 3.142 (1H, dd, J=2.6 Hz, J=7.9 Hz, H-6), 2.394 (3H, s, SCH3), 2.17-1.68 (3H, m, and bs, OH and CH2 -4) and 1.391 ppm (3H, d, J=6.2 Hz, CH3).
B. Sodium (4R,5S,6S)-4-(2"-azidoethyl)-6[(1'R)-1'-hydroxyethyl]-3-methylthio-7-oxo-1 -azabicyclo[3.2.0]hept-2-ene-2-carboxylate ##STR178##
A cold (ice-bath) solution of allyl (4 R,5 S,6 S)-4-(2"-azidoethyl)-6-[(1' R)-1'-hydroxyethyl]-3-methylthio-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-car boxylate (0.53 g, 1.5 mmol) in CH2 Cl2 (5 mL) was treated with Pd(PPh3)4 (50 mg) and a 0.5M solution of sodium 2-ethylhexanoate in EtOAc (3.2 mL, 1.6 mmol). The ice bath was removed and the mixture was stirred for 30 min. It was diluted with ethyl acetate (20 mL) and extracted with water (2×10 mL). The aqueous phases were combined, washed with diethyl ether (20 mL) and passed through a reversed phase μ-Bondapak C18 column (50 g, H2 O→5% CH3 CN2 O) to give the title compound (0.32 g, 64%) as a lyophilized powder;
1 H NMR (D2 O, 200 MHz) δ: 4.33-4.19 (1H, m, H-1'), 4.221 (1H, dd, J=2.7 Hz, J=9.6 Hz, H-5), 3.63-3.33 (3H, m, H-4, CH2 --N), 3.401 (1H, dd, J=2.7 Hz, J=6.4 Hz, H-6), 2.365 (3H, s, SCH3), 2.13-1.95, 1.89-1.70 (2H, 2 sets of m, CH2 -4) and 1.334 ppm (3H, d, J=6.4 Hz, CH3).
C. (4R, 5S,6S)-4-(2"-Aminoethyl)-6-[(1'R)-1'-hydroxyethyl]-3-methylthio-7-oxo-1-az abicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR179##
A cold (ice bath) solution of sodium (4 R,5 S,6 S)-4-(2"-azidoethyl)-6-[(1' R)-1'-hydroxyethyl]-3-methylthio-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-car boxylate (320 mg, 0.960 mmol) in water (20 mL) was shaken on a Parr hydrogenator at 45-50 psi hydrogen for 90 min using 30% Pdelite (320 mg) as catalyst. The catalyst was removed by filtration and the aqueous phase was passed three time on μ-Bondapak C18 column (50 g, 800 g and 80 g, H2 O) to give the title compound (82 mg, 30 %) as a lyophilized powder;
Purity: 91.8% (HPLC, 304 nm);
UV (H2 O) λmax : 304 (ε8110);
IR (Nujol) δ: 3600-3200 (OH), 1750 and 1600 cm-1 (C═O);
1 H NMR (D2 O, 200 MHz) δ: 4.34-4.21 (1H, m, H-1'), 4.231 (1H, dd, J=2.6 Hz, J=6.6 Hz, H-5), 3.53-3.40 (1H, m, H-4), 3.385 (1H, dd, J=2.6 Hz, J=6.6 Hz, H-6), 3.14-3.05 (2H, m, CH2 N), 2.34 (3H, s, SCH3), 2.23-2.80 (2H, 2 sets of m, CH2 -4) and 1.335 ppm (3H, d, J=6.3 Hz, CH3).
(4R,5S,6S)-4-(2"-Guanidinoethyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(1,2,3-thiadi azol-4-yl)methylthio]-7-oxo-1-azabicyclo-[3.2.0]hept-2-ene-2-carboxylic acid ##STR180##
A cold solution (ice bath) of (4 R,5 S,6 S)-4-(2"-aminoethyl)-6-[(1' R)-1'-hydroxyethyl]-3-[(1,2,3-thiadiazol-4-yl) methylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid (160 mg, 0.432 mmol) from Example 38 in a 0.04M aqueous pH 7.4 phosphate buffer solution (25 mL) was treated with a 0.1N aqueous NaOH solution (to adjust and maintain the pH between 7.6-7.8) and portionwise with aminoiminomethanesulfonic acid (533 mg, 4.30 mmol). The mixture was stirred for 45 min and the pH was adjusted to 6.9 with a 0.1N aqueous HCl solution. The aqueous mixture was passed through a μ-Bondapak C18 reversed phase column (50 g, H2 O→1%-5% CH3 CN2 O) to give the title compound (93 mg, 52%) as a lyophilized powder;
Purity: 99.7% (HPLC, 300 nm);
UV (H2 O) λmax : 302 (ε8300);
IR (Nujol) νmax : 3400-3100 (OH), 1755 (C═O), 1665 (C═N) and 1585 cm-1 (C═O);
1 H NMR (D2 O, 200 MHz) δ: 8.886 (1H, s, aromatic --H), 4.651, 4.577, 4.421, 4.347 (2H, ABq, J=14.9 Hz, CH2 -aromatic), 4.3-4.17 (1H, m, H-1'), 4.143 (1H, dd, J=2.7 Hz, J=9.7 Hz, H-5), 3.405 (1H, dd, J=2.7 Hz, J=6.8 Hz, H-6), 3.38-3.1 (3H, m, H-4 and CH2 --N), 2.15-1.95, 1.8-1.55 (2H, 2 set of m, CH2 -4) and 1.315 (3H, d, J=6.4 Hz, CH3).
(4R,5S,6S)-4-(3"-Aminopropyl)-3-[(2-cyanoethyl)thio]-6-[(1'R)-1'-hydroxyeth yl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR181## A. Allyl (4R,5S,6S)-4-(3"-azidopropyl)-3-[(2-cyanoethyl)thio]-6-[(1'R)-1'-hydroxyet hyl]-7-oxo-1-azabicyclo-[3.2.0]hept-2-ene-2-carboxylate ##STR182##
A cold solution (ice-MeOH bath) of allyl (2 R,4 R,5 S,6 S)-4-(3"-azidopropyl)-6-[(1' R)-1'-hydroxyethyl]-3,7-dioxo-1-azabicyclo[3.2.0]heptan-2-carboxylate, prepared from (3 S,4 R)-3-[(1' R)-1'-hydroxyethyl]-4[(1" R)-1"(3"-azidopropyl)-3"-diazo-3"-allyloxycarbonyl-2"-oxopropyl]azetidin-2 -one (2.16 g, 5.90 mmol), as prepared in Example 21, Step B in CH3 CN (40 mL) was treated dropwise with diphenyl chlorophosphate (1.3 mL, 6.5 mmol) and N,N-diisopropylethylamine (1.12 mL, 6.5 mmol) and a trace of 4-dimethylaminopyridine. The mixture was stirred for 45 min and the resulting enolphosphate was silylated by the successive addition of trimethylsilyl chloride (0.84 mL, 6.5 mmol) and N,N-diisopropylethylamine (1.12 mL, 6.50 mmol).
The mixture was stirred for 30 min and the resulting enol phosphate silyl ether was treated with cyanoethanethiol (640 mg, 7.37 mmol) and N,N-diisopropylethylamine (1.27 mL, 7.37 mmol). The mixture was stirred for 30 min after which the ice-MeOH bath was replaced by an ice bath and stirring was continued for 30 more minutes. Then cyanoethanethiol (160 mg, 1.84 mmol) and N,N-diisopropylethylamine (0.317 mL, 1.84 mmol) was added in, followed by a stirring period of 1 h. More cyanoethanethiol (160 mg, 1.84 mmol) and N,N-diisopropylethylamine (0.317 mL, 1.84 mmol) was added and after 30 min stirring the mixture was diluted with EtOAc (100 mL), washed with ice cold water (3×40 mL), 1M aqueous NaHSO3 (3×40 mL), water (40 mL), 1M aqueous NaHCO3 (40 mL), water (40 mL), brine (40 mL) and dried (MgSO4). The residue obtained upon solvent evaporation was dissolved in THF (40 mL), cooled to -15°C (ice-MeOH bath) and treated successively with acetic acid (2 mL, 35.4 mmol) and dropwise with a 1M solution of tetrabutylammonium fluoride in THF (17.7 mL, 17.7 mmol). The mixture was stirred for 40 min, diluted with EtOAc (100 mL), washed with cold 1N aqueous HCl (20 mL), water (2×20 mL), 1M aqueous NaHCO3 (20 mL), water (2×20 mL), brine and dried (MgSO4). The residue was passed through a silica gel flash column (50 g, CH2 Cl2 →10, 20, 40, 60% EtOAcH2 Cl2) to give the title compound as an oil (1.41 g, 59.0%);
IR (CH2 Cl2) νmax : 3600, 3500 (OH), 2100 (N3), 1780 and 1710 cm-1 (C═O);
1 H NMR (CDCl3, 200 MHz) δ: 6.07-5.87 (1H, m, vinylic H), 5.50-5.24 (2H, m, vinylic H), 4.89-4.63 (2H, m, allylic-CH2), 4.279 (1H, dd, J=2.8 Hz, J=9.7 Hz, H-5), 4.3-4.17 (1H, m, H-1'), 3.52-3.36 (2H, m, CH2 N3), 3.30-3.2 (1H, m, H-4), 3.277 (1H, dd, J=2.8 Hz, J=7.6 Hz, H-6), 3.22-2.93 (2H, m, SCH2), 2.82-2.56 (2H, m, CH2 CN), 2.0-1.7 (5H, m, OH, CH2 CH2) and 1.395 ppm (3H, d, J=6.2 Hz, CH3).
B. (4R,5S,6S)-4-(3"-Aminopropyl)-3-[(2-cyanoethyl)thio]-6-[(1'R)-1'hydroxyeth yl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR183##
A cold (ice bath) solution of allyl (4 R,5 S,6 S)-4-(3"-azidopropyl)-3-[(2-cyanoethyl)thio]-6-[(1' R)-1'-hydroxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate (661 mg, 1.63 mmol) in CH2 Cl2 (66 mL) was treated with Pd(PPh3)4 (132 mg, 0.110 mmol) and dropwise with a 0.5M solution of sodium ethyl-2-hexanoate (3.3 mL, 1.7 mmol). The mixture was stirred for 50 min, diluted with diethyl ether (250 mL) and extracted with a 0.04M pH 7 phosphate solution (3×10 mL). The aqueous extracts were combined, washed with diethyl ether (2×50 mL) and the pH was lowered to 5.9 with a 1M aqueous NaH2 PO4 buffer solution. To this mixture (crude sodium salt of (4 R,5 S,6 S)-4-(3"-azidopropyl)-3-(2-cyanoethylthio)-6-[(1' R)-1'-hydroxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate) was added Pdelite (660 mg) and it was shaken on a Parr hydrogenator at 45-50 psi hydrogen for 1 h at 5°C (ice bath, initial temperature, 15°C final temperature). The catalyst was removed by filtration and washed with water (2×10 mL). The aqueous solution was passed through a μ-Bondapak C18 reversed phase column (165 g, H2 O→1% CH3 CN) to give the 3-aminopropyl title compound and the 3-hydroxypropyl derivative (363 mg) described in Example 42 as 74:26 mixture. The mixture was passed again on the reversed phase column (180 g, pH 6.0, 0.01M phosphate buffer) to give both derivatives with phosphate salts.
The salt of the 3-aminopropyl compound was removed by reversed phase chromatography to give pure title compound (182 mg, 33%);
Purity: 98.3% (HPLC 300 nm);
UV (H2 O) λmax : 300 (7900);
IR (nujol) νmax : 1755 and 1585 cm-1 (C═O);
1 H NMR (D2 O, 200 MHz) δ: 4.34-4.21 (1H, m, H-1'), 4.268 (1H, dd, J=2.5 Hz, J=6.8 Hz, H-5), 3.408 (1H, dd, J=2.5 Hz, J=6.5 Hz, H-6), 3.47-3.38 (1H, m, H-4), 3.23-2.91 (4H, m, CH2 NH2, CH2 S), 2.89-2.80 (2H, m, CH2 CN), 1.92-1.50 (4H, m, CH2 CH2) and 1.334 ppm (3H, d, J=6.3 Hz, CH3).
Sodium (4R,5S,6S)-3-[(2-cyanoethyl)thio]-6-[(1'R)-1'-hydroxyethyl]-4-(3"-hydroxyp ropyl)-7-oxo-1-azabicyclo-[3.2.0]hept-2-ene-2-carboxylate ##STR184##
A cold (ice bath) solution of allyl (4R,5 S,6 S)-4-(3"-azidopropyl)-3-[(2-cyanoethyl)thio]-6-[(1' R)-1'-hydroxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate (661 mg, 1.63 mmol) from Example 41, Step A in CH2 Cl2 (66 mL) was treated with Pd(PPh3)4 (132 mg, 0.110 mmol) and dropwise with a 0.5M solution of sodium ethyl-2-hexanoate (3.3 mL, 1.7 mmol). The mixture was stirred for 50 min, diluted with diethyl ether (250 mL) and extracted with a 0.04M pH 7 phosphate solution (3×10 mL). The aqueous extracts were combined, washed with diethyl ether (2×50 mL) and the pH was lowered to 5.9 with a 1M aqueous NaH2 PO4 buffer solution. To this mixture (crude sodium salt of (4 R,5 S,6 S)-4-(3"-azidopropyl)-3-(2-cyanoethylthio)-6-[(1' R)-1'-hydroxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate) was added 30% Pdelite (660 mg) and it was shaken on a Parr hydrogenator at 45-50 psi hydrogen for 1 h at 5°C (ice bath, initial temperature, 15°C final temperature). The catalyst was removed by filtration and washed with water (2×10 mL). The aqueous solution was passed through a μ-Bondapak C18 reversed phase column (165 g, H2 O→1% CH3 CN) to give the 3-aminopropyl compound of Example 41 and the 3-hydroxypropyl title compound (363 mg) as 74:26 mixture. The mixture was passed again on the reversed phase column (180 g, pH 6.0, 0.01M phosphate buffer) to give both derivatives with phosphate salts.
The salt of the 3-hydroxypropyl compound was removed by reversed phase chromatography (H2 O) to give the title compound (85 mg, 14%) as a lyophilized powder;
Purity: 92.5% (HPLC 300 nm);
IR (Nujol) νmax : 1745 and 1695 cm-1 (C═O);
UV (H2 O) λmax : 302 (9600);
1 H NMR (D2 O, 200 MHz) δ: 4.34-4.21 (1H, m, H-1'); 4.270 (1H, dd, J=2.4 Hz, J=12.0 Hz, H-5), 3.65, 2H, bt, J=6.0 Hz, CH2 O), 3.450 (1H, dd, J=2.5 Az, J=6.0 Hz, H-6); 3.45-3.35 (1H, m, H-4), 3.25-3.06, 3.03-2.9 (2H, 2 sets of m, SCH2), 2.88-2.80 (2H, m, CH2 CN), 1.94-1.41 (4H, m, CH2 CH2) and 1.331 ppm (3H, d, J=6.4 Hz, CH3).
(4R,5S,6S)-4-[3"-(N-Formimidoyl)aminopropyl]-3-[(2-cyanoethyl)thio]-6-[(1'R )-1'-hydroxyethyl]-7-oxo-1-azabicyclo-[3.2.0]hept-2-ene-2-carboxylic acid ##STR185##
To a cold (ice bath) solution of (4 R,5 S,6 S)-4-(3"-aminopropyl)-3-[(2-cyanoethyl)thio]-6-[(1' R)-1'-hydroxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carbocylic acid (135 mg, 0.400 mmol) from Example 41 in a 0.04M pH 7.0 aqueous phosphate buffer solution (25 mL) was added a 0.1N aqueous NaOH solution to bring the pH to 8.2-8.4 and benzyl formimidate hydrochloride (685 mg, 4.00 mmol) portionwise; the pH of the aqueous mixture being maintained at 8.0-8.4. The mixture was stirred for 10 min and then the pH was lowered to 7.0 with a 0.1N aqueous HCl solution. The solution was passed twice through a μ-Bondapak C18 reversed phase column (30 g, H2 O→1%, 2% CH3 CN2 O) to give the title compound (99 mg, 69%) as a lyophilized powder;
Purity: 97.8% (HPLC 300 nm);
UV (H2 O) λmax : 300 (9350);
IR (Nujol) νmax : 1760 (C═O), 1710 (C═N) and 1590 cm-1 (C═O);
1 H NMR (D2 O, 200 MHz) δ: 7.83, 7.81 (1H, 2s, CH), 4.725 (1H, dd, J=2.5 Hz, J=6.1 Hz, H-5), 4.31-4.20 (1H, m, H-1'), 3.50-3.35 (4H, m, H-4, H-6 and CH2 N), 3.22-3.08 and 3.02-2.91 (2H, 2 sets of m, SCH2), 2.89-2.80 (2H, m, CH2 CN), 1.92-1.50 (4H, m, CH2 CH2) and 1.323 ppm (3H, d, J=6.4 Hz, CH3).
(4R,5S,6S)-4-(3"-Aminopropyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(pyridin-4-yl)me thylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR186## A. Allyl (4R,5S,6S)-4-(3"-azidopropyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(pyridin-4-yl)m ethylthio]-7-oxo-1-azabicyclo [3.2.0]hept-2-ene-2-carboxylate ##STR187##
A cold (ice MeOH bath) solution of allyl (4 R,5 S,6 S)-6'-[(1' R)-1'-hydroxyethyl]-4-(3"-azidopropyl)-3,7-dioxo-1-azabicyclo[3.2.0]hept-2 -ene-2-carboxylate [from (3 S,4 R)-3-[(1' R)-1'-hydroxyethyl]-4-[(1" R)-1"-(3-azidopropyl)-3"-diazo-3"-allyloxycarbonyl-2"-oxopropyl]azetidin-2 -one (4.0 g, 11 mmol) as prepared in Example 21, Step B heated under reflux in benzene (300 mL) with Rh(OAc)2 (100 mg) for 45 min] in CH3 CN (100 mL) was treated dropwise with diphenyl chlorophosphate (2.6 mL, 12 mmol), N,N-diisopropylethylamine (2.2 mL, 12 mmol) and 4-N,N-dimethylaminopyridine (20 mg). The mixture was stirred for 1 h, then treated with 4-picolyl mercaptan (2.07 g, 16.5 mmol) and N,N-diisopropylethylamine (3.1 mL, 17 mmol) and kept for 18 h at 5° C. The mixture was diluted with ethyl acetate (300 mL), washed with cold 1M aqueous NaHCO3 (1×100 mL), H2 O (2×100 mL), 1M aqueous NaHSO3 (1×100 mL), water (2×100 mL), brine (100 mL) and dried (MgSO4). The residue (5 g) was passed through a silica gel flash pad (150 g, hexanetOAc→CH3 CN) to give the title compound (3.0 g, 62%) as an oil.
IR (CH2 Cl2) νmax : 3680-3600 (OH), 2100 (N3), 1780 and 1710 cm-1 (C═O);
1 H NMR (CDCl3, 200 MHz) δ: 8.58-8.55 (2H, m, aromatic --H), 7.29-7.20 (2H, m aromatic H), 6.06-5.86 (1H, m, vinylic --H), 5.49-5.22 (2H, m, vinylic --H), 4.89-4.63 (2H, m, allylic --CH2), 4.27-4.14 (1H, m, H-1'), 4.109 (1H, dd, J=2.7 Hz, J=9.6 Hz, R-5), 4.10, 4.03, 3.98, 3.91 (2H, ABq, J=14.2 Hz, CH2 -aromatic), 3.43-3.22 (2H, m, CH2 --N), 3.200 (1H, dd, J=2.7 Hz, J=7.6 Hz, H-6), 3.10-2.98 (1H, m, H-4), 2.19 (1H, bs, OH), 1.91-1.43 (4H, m, CH2 CH2 -4) and 1.360 (3H, d, J=6.2 Hz, CH3).
B. Sodium (4R,5S,6S)-4-(3"-azidopropyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(pyridin-4-yl)m ethylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate ##STR188##
A cold (ice-bath) solution of allyl (4 R,5 S,6 S)-4-(3"-azidopropyl)-6-[(1' R)-1'-hydroxyethyl]-3-[(pyridin-4-yl)methylthio]7-oxo-1-azabicyclo[3.2.0]h ept-2-ene -2-carboxylate (3.0 g, 6.8 mmol) in CH2 Cl2 (50 mL) was treated with Pd(PPh3)4 (150 mg) and a 0.5M solution of sodium ethyl-2-hexanoate (14 mL, 7 mmol) in ethyl acetate. The mixture was stirred for 60 min, then diluted with hexaneiethyl ether (1/1) and extracted with a 0.05M aqueous phosphate buffer (1×100 mL and 2×25 mL). The aqueous layers were combined, washed with diethyl ether (100 mL) and passed through a μ-Bondapak C18 column (300 g, H2 O→5% CH3 CN/H2 O) to give the title compound (0.8 g, 30%);
1 H NMR (D2 O, 200 MHz) δ: 8.50-8.46 (2H, m aromatic --H), 7.50-7.20 (2H, m, aromatic --H), 4.28-4.15 (1H, m, H-1'), 4.19, 4.11, 4.03, 3.95 (2H, ABq, J=14.6 Hz, CH2 -aromatic), 4.073 (1H, dd, J=2.7 Hz, J=9.5 Hz, H-5), 3.37-3.29 (3H, m, H-6 and CH2 N), 3.16-3.06 (1H, m, H-4), 1.8-1.38 (4H, 2 sets of m, CH2 CH2 -4) and 1.288 ppm (3H, d, J=6.4 Hz, CH3).
C. (4R,5S,6S)-4-(3"-Aminopropyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(pyridin-4-yl)m ethylthio]-7-oxo-1-azabicyclo[3.2.0]-hept-2-ene-2-carboxylic acid ##STR189##
A cold solution of sodium (4 R,5 S,6 S)-4-(3"-azidopropyl)-6-[(1' R)-1'-hydroxyethyl]-3-[(pyridin-4-yl)methylthio]-7-oxo-1-azabicyclo[3.2.0] hept-2-ene-2-carboxylate (270 mg, 0.60 mmol) in water (55 mL) was shaken in a Parr hydrogenator at 5°C (ice bath) for 2.5 h at 45-50 psi hydrogen using 5% Pdlumina (540 mg) as catalyst. The catalyst was removed by filtration and the aqueous solution was passed through a μ-Bondapak C18 reversed phase column (50 g, H2 O→7% CH3 CN/H2 O) to give the title compound (127 mg, 53%) as a lyophilized powder;
Purity: 97.2% (HPLC, 300 nm);
UV (H2 O) λmax : 262 (ε5210), 304 (ε7950);
IR (nujol) νmax : 3600-3100 (OH), 1760 and 1600 cm-1 (C═O);
1 H NMR (D2 O, 200 MHz) δ: 8.49-8.46 (2H, m, aromatic --H), 7.52-7.24 (2H, m, aromatic --H), 4.28-4.16 (1H, m H-1'), 4.16, 4.08, 4.02, 3.94 (2H, ABq, J=14.6 Hz, CH2 -aromatic), 4.076 (1H, dd, J=2.7 Hz, J=6.5 Hz, H-6), 3.20-3.10 (1H, m, H-4), 3.00-2.93 (2H, m, CH2 N), 1.80-1.38 (4H, m, CH2 CH2 -4) and 1.292 ppm (3H, d, J=6.4 Hz, CH3).
(4R,5S,6S)-4-(4"-Aminobutyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(pyridin-3-yl)met hylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2'-ene-2-carboxylic acid ##STR190## A. 6-Azidohexanoyl chloride ##STR191##
A solution of 6-azidohexanoic acid (151 g, 0.96 mol) [M. Rothe and K. Gehrke, Makromol. Chem. 83, 1 (1965); C.A. 64:4934d.] in dry CH2 Cl2 (500 mL) was treated at 22°C with oxalyl chloride (88.0 mL, 1.0 mmol) added dropwise over 30 min. After 2 h, two drops of N,N-dimethylformamide were added and the solution was stirred at 22°C, under nitrogen, for 18 h. The solvent was then evaporated under vacuum to give the crude acid chloride as a clear oil which was used as such for the next step:
IR (NaCL, film) νmax : 2100 (N3) and 1800 cm-1 (C═O);
1 H NMR (200 MHz, CDCl3) δ: 1.3-1.9 (m, 6H, CH2 -3,4 and 5), 2.9 (t, J=7 Hz, 2H, CH2 -2) and 3.3 ppm (t, J=6.5 Hz, 2H, CH2 -6).
B. 2-Picolyl 6-(azido)thiolhexanoate ##STR192##
A solution of 2-picolyl mercaptan (130.6 g, 1.04 mol) dry CH2 Cl2 (1.3 L) was cooled to 0°-5°C, treated with pyridine (85 mL, 1.05 mol) and a solution of 6-azidohexanoyl chloride (179 g, 1.02 mol) in CH2 Cl2 (200 mL) added dropwise over 1 h. After another hour at 0°-5°C, the organic phase was washed with water, saturated NaHCO3, brine and dried (MgSO4). Evaporation of the solvent gave 244 g (90%) of the thioester as a clear oil which was used as such for the next step:
IR (NaCl, film) νmax : 2100 (N3) and 1680 cm-1 (C═O of thioester);
1 H NMR (200 MHz, CDCl3) δ: 1.3-1.8 (m, 6H, CH2 -3,4, and 5), 2.6 (t, J=7.34 Hz, 2H, CH2 -2), 3.25 (t, J=6.7 Hz, 2H, CH2 -6), 4.25 (s, 2H, SCH2), 7.16 (m, 1H, H-5 of pyridine), 7.33 (d, J=7.8 Hz, 1H, H-3 of pyridine), 7.62 (m, 1H, H-4 of pyridine) and 8.53 ppm (m, 1H, H-6 of pyridine).
C. O-tert-Butyldimethylsilylether of 2-picolyl 6-(azido)thiolhexanoate ##STR193##
A solution of 2-picolyl 6-(azido)thiolhexanoate (244 g, 0.92 mol) in 1 L of dry CH2 Cl2 was cooled to -10°C, treated with triethylamine (260 mL, 1.86 mol) followed by tert-butyldimethylsilyl trifluoromethanesulfonate (318 mL, 1.38 mol) added dropwise over 40 min. The temperature of the mixture was allowed to reach 22°C and the solution was stirred for 3 h. The reaction mixture was then diluted with hexanes (1.5 L) washed with cold water (2×1 L), saturated NaHCO3, brine and dried (MgSO4). The solution was then treated with activated carbon (neutral), filtered and concentrated under vacuum. The residual black tarry material was extracted with hexanes (1.5 L) and the extract was evaporated to give 315 g (90%) of the crude silyl enolether as a black oil which was used as such for the coupling step. By 1 H NMR, this product is a 1:1 mixture of E and Z isomer.
IR (NaCl, film) νmax : 2090 (N3), 1625 and 1590 cm-1 ;
1 H NMR (200 MHz, CDCl3) δ: 0.2 and 0.24 (2×s, 6H, SiCH3), 0.97 and 0.98 (2×s, 9H, Si t-Bu), 1.2-1.8 (m, 4H, CH2 -4 and 5), 2.0 (m, 2H, CH2 --CH═C), 3.17 (m, 2H, C H2 N3), 3.95 and 4.03 (2×s, 2H, SCH2), 4.82 and 4.97 (2×t, 1H, J=7.26 Hz, and J=7.58 Hz, 2×1H, CH2 -- CH═C), 7.14 (m, 1H, H-5 of pyridine), 7.26 (m, 1H, H-3 of pyridine), 7.6 (m, 1H, H-4 of pyridine) and 8.55 ppm (m, 1H, H-6 of pyridine).
D. (3S,4S)-3-[(1'R)-1'-tert-Butyldimethylsilyloxyethyl]-4-[(1"R)-1"-(pyridin- 2-yl)methylthiocarbonyl-5"-azidopentyl]-azetidin-2-one ##STR194##
To a cold (0°-5°C) suspension of freshly fused zinc chloride (151 g, 1.1 mol) in dry dichloromethane (2.6 L) was added 238 g (0.83 mol) of (3S,4R)-4-acetoxy-3-[(1'R)-1'-tert-butyldimethylsilyloxyethyl]-azetidin-2- one followed by a solution of the crude O-tert-butyldimethylsilylether of 2-picolyl 6-(azido)thiolhexanoate (315 g, 0.83 mol) in dry dichloromethane. The temperature of the solution was slowly allowed to reach 22°C (∼3 h) and the resulting homogeneous mixture was stirred for 18 h. The reaction mixture was then washed successively with water, saturated NH4 Cl, saturated NaHCO3, water and brine. After drying (MgSO4) evaporation of the solvent gave 494 g of a dark oil which was used as such for the next step. By 1 H NMR analysis, this crude product was found to be a mixture of 1'R and 1'S pentyl in a 8:2 ratio. Purification of a small aliquot on silica gel (elution toluene-EtOAc, 1:1) gave the pure isomer of the title compound as a white crystalline product: mp81°-83°C (hexanes);
UV (EtOH) λmax : 236 (5576) and 264 nm (4,989);
IR (KBr) νmax : 2100 (N3), 1758 (C═O of β-lacta), 1718 (C═O of ester) and 1680 cm-1 (C═O of thioester);
1 H NMR (200 MHz, CDCl3), δ: 0.04 (s, 6H, SiCH3), 0.85 (s, 9H, Sit-Bu), 0.99 (d, J=6.32 Hz, 3H, CH3 CHO), 1.2-2.0 (m, 6H, CH2 -2,3 and 4 of pentyl) 2.79 (m, 1H, H-1 of pentyl), 3.04 (broad s, 1H, H-3 of azetidinone), 3.23 (t, J=6.56 Hz, 2H, CH2 N3), 3.80 (dd, JH3,H4 =2.08 Hz, JH3,H1 =6.97 Hz, 1H, H-3 of azetidinone), 4.14 (m, 1H, CH3 C HO) 4.26 (s, 2H, SCH2), 5.85 (broad s, 1H, NH), 7.18 (m, 1H, H-5 of pyridine), 7.32 (d, J=7.8 Hz, 1H, H-3 of pyridine), 7.62 (m, 1H, H-4 of pyridine) and 8.5 ppm (m, 1H, H-6 of pyridine).
Anal. Calcd. for C23 H37 N5 O3 SSi: C, 56.18; H, 7.58; N, 14.24. Found: C, 56.25; H, 7.59; N, 14.10.
E. (3S, 4S )-3-[(1'R)-1'-tert-Butyldimethylsilyloxyethyl]-4-[(1"R)-1"-carboxy-5"-azid opentyl]azetidin-2-one ##STR195##
A solution of the crude (3S,4S)-3-[(1'R)-1'-tert-butyldimethylsilyloxyethyl]-4-[(1"R)-1"-(pyridin- 2-yl)-methylthiocarbonyl-5"azidopentyl]azetidin-2-one (∼400 g, 0.83 mol) in 3 L of tetrahydrofuran was cooled to 0°C and treated with 30% hydrogen peroxide (1 L, 11.6 mol) added cautiously in portions, followed by 2.8 L of 1M NaOH added dropwise over 2 h. The solution was stirred for two more hours at 0°-5°C and acidified to pH 2.0 with 3N HCl (∼1L). The reaction mixture was then extracted with EtOAc (2 L and 3×1 L) and the combined organic extract was washed with water, 1M NaHSO3, brine and dried (MgSO4). Evaporation of the solvent gave a dark oil which was dissolved In hexanes (2 L) and extracted with saturated NaHCO3 (4×1 L). The combined aqueous phase was cooled to 0°-5°C and acidified to pH 2 with 3N HCl. The white precipitate formed was collected and washed with water. The moist cake was dissolved in CH2 Cl2, dried (MgSO4) and evaporated to give 114 g of the crude product. Crystallization from a mixture of ethyl acetate and hexanes gave 67.4 g (21%) of the pure title acid as white plates; mp=132°-133°C
IR (KBr) νmax : 3280 (NH), 2500 (COOH), 2110 (N3), 1760 (sh), 1715 and 1690 cm-1 (C═O of acid and β-lactam);
1 H NMR (200 MHz, CDCl3) δ: 0.06 and 0.07 (2×s, 2×3H, SiCH3), 0.87 (s, 9H, Si t-Bu), 1.17 (d, J=6.29 Hz, 3H, C H3 CHO), 1.4-1.8 (m, 6H, CH2 -2, 3 and 4 of pentyl), 2.64 (m, 1H, H-1 of pentyl), 3.14 (m, 1H, H-3), 3.29 (t, J=6.5 Hz, 2H, CH2 N3), 3.87 (dd, JH4,H3 =1.90 Hz, JH4,H1 =6.22 Hz, 1H, H-4), 4.20 (dq, JH,CH3 =6.29 Hz, JH,H3 =4.04 Hz, 1H, CH3 CHO), and 6.46 ppm (s, 1H, NH).
Anal. Calcd. for C17 H32 N4 O4 S: C, 53.10; H, 8.39; N, 14.57. Found: C, 53.08; H, 8.12; N, 14.56.
F. (3S,4R)-4-[(1"R)-1"-(4-Azidobutyl)-3"-allyloxycarbonyl-2"-oxopropyl]-3-[(1 'R)-1'-tert-butyldimethylsilyloxyethyl]-azetidin-2-one ##STR196##
A suspension of (3S,4S)-3-[(1'R)-1'-tert-butyldimethylsilyloxyethyl]-4-[(1"R)-1"-carboxy-5 "-azidopentyl]azetidin-2-one (67.0 g, 0.174 mol) in dry CH3 CN (1.5 L) was treated at 22°C and under nitrogen with 1,1-carbonyldiimidazole (31.1 g, 0.192 mol) and the resulting mixture was stirred for 2 h. The solution was then concentrated under vacuum to give the crude imidazolide as an oil: IR (NaCl, film) 2100 (N3), 1755 (C═O of β-lactam) and 1730 cm-1 (C═O of imidazolide).
The crude imidazolide in dry CH3 CN (200 mL) was then added to a solution of dried magnesium monoallyl malonate (87.0 g, 0.28 mol) in benzene (1.4 L), and the resulting mixture was stirred at 60°-65°C for 16 h. The cooled reaction mixture was then diluted with ethyl acetate (1L), washed successively with cold water, 0.1N HCl, saturated NaHCO3, water and brine. After drying (MgSO4), evaporation of the solvent gave 80.3 g of the crude keto ester as an oil which was used as such for the next step. Purification of a small aliquot on silica gel gave the pure title compound as a clear oil. By 1 H NMR this product is a 1:1 mixture of keto and enol form:
IR (NaCl, film) νmax : 2100 (N3), 1760 (C═O of β-lactam) and 1715 cm-1 ;
1 H NMR (200 MHz, CDCl3) δ: 0.05 and 0.06 (2×s, 6H, SiCH3), 0.86 (s, 9H, Si t-Bu), 1.10 and 1.17 (2d, J=6.33 Hz, and J=6.28 Hz, 3H, CH3 CHO), 1.2-1.8 (m, 6H, CH2 -1,2 and 3 of butyl), 2.1-2.3 (m, 1H, H-1 of butyl), 1.2-2.3 (m, 6H, CH2 -1,2 and 3 of butyl), 2.9 and 2.97 (2×m, 1H, H-3 of azetidinone), 3.27 (broad t, 2H, CH2 N3), 3.54 (s, CH2 -3 of oxopropyl, keto form), 3.83 (two overlapping dd, 1H, H-4 of azetidinone), 4.17 (m, 1H, CH3 CHO), 4.64 (m, 2H, CH2 of allyl), 5.07 (s, CH-3 of oxopropyl, enol form), 5.2-5.4 and 5.8-6.0 (2×m, 2H and 1H, CH of allyl) and 6.0 ppm (broad s, 1H, NH).
G. (3S,4R)-4-[(1"R)-1"-(4-Azidobutyl)-3"-allyloxycarbonyl-3"-diazo-2"-oxoprop yl]-3-[(1'R)-1'-tert-butyldimethyl-silyloxyethyl]azetidin-2-one ##STR197##
A solution of crude (3S,4R)-4-[(1"R)-1"-(4-azidobutyl)-3"-allyloxycarbonyl-2"-oxopropyl]-3-[(1 'R)-1'-tert-butyldimethylsilyloxyethyl]azetidin-2-one (79 g, 0.169 mol) in acetonitrile (400 mL) was cooled to 0°-5°C and treated with a solution of p-toluenesulfonyl azide (40 g, 0.20 mol) in acetonitrile (500 mL). Then triethylamine (28.3 mL, 0.20 mmol) was added dropwise (5 min) and the resulting mixture was stirred for 2 h. The solvent was then concentrated under vacuum and the residue was triturated with a mixture of diethyl ether and hexanes (1:1). The crystalline p-toluenesulfonamide was collected by filtration and the filtrate was evaporated to give the title diazo compound as an oil (86 g). This material can be used as such for the cleavage of the silyl ether.
Purification of part of the crude (30 g) on silica gel (9×13 cm, elution hexanes-EtOAc, 9:1 to 7:3) gave 17.5 g (correspond to a 59% yield from the acid, two steps) of the title diazo azetidinone as a clear oil:
IR (NaCl, film) νmax : 2140 (N2), 2100 (N3), 1760 (C═O of β-lactam), 1720 (C═O of ester) and 1650 cm-1 ;
1 H NMR (200 MHz, CDCl3) δ: 0.05 and 0.06 (2×s, 2×3H, Si CH3), 0.86 (s, 9H, t-Bu), 1.17 (d, J=6.31 Hz, 3H, CH3 CHO), 3.04 (m, 1H, H-3 of azetidinone), 3.25 (m, 2H, CH2 N3), 3.84 (dd, JH4,H3 =2.09 Hz, JH4,H1 =5.33 Hz, 1H, H-4 of azetidinone), 4.07 (m, 1H, H-1 of oxopropyl), 4.17 (dq, JH,CH3 =6.31 Hz, JH,H3 =3.94 Hz, 1H, CH3 CHO), 4.72 (m, 2H, CH2 of allyl), 5.3-5.4 and 5.9-6.1 (2×m, 2H and 1H, CH of allyl), and 5.84 ppm (s, 1H, NH).
H. (3S,4R)-4-[(1"R)-1"-(4-Azidobutyl)-3"-allyloxycarbonyl-3"-diazo-2"-oxoprop yl]-3-[(1'R)-1'-hydroxyethyl]azetidin-2-one ##STR198##
A solution of (3S, 4R)-4-[(1"R)-1"-(4-azidobutyl )-3"-allyloxycarbonyl-3"-diazo-2"-oxopropyl]-3-[(1'R)-1'-tert-butyldimethy lsilyloxyethyl]azetidin-2-one (17.5 g, 35.5 mmol) in ethanol (300 mL) was treated at 24°C with 1N HCl (100 mL) and stirred in the dark for 16 h. The reaction mixture was neutralized with Na2 CO3, and concentrated in vacuo. The residual aqueous solution was extracted with ethyl acetate (500 mL and 250 mL) and the combined organic phase was washed with water, brine and dried (MgSO4). Evaporation of the solvent gave a solid which after crystallization from diethyl ether-hexanes and purification of the mother liquors on silica gel (ethyl acetate) gave 11.8 g (88%) of the title compound as white needles: m.p=73°-74°C;
UV (EtOH) λmax : 260 nm (8,365);
IR (KBr) νhd max: 3350 (OH) 2160 (N2) 2080 (N3) 1738 (C═O of β-lactam), 1716 (C═O of ester) and 1650 cm-1 ;
1 H NMR (200 MHz, CDCl3) δ: 1.30 (d, J=6.33 Hz, 3H, CH3 CHO), 1.3-2.0 (m, 6H, CH2 -1,2 and 3 of butyl), 2.28 (d, J=3.8 Hz, 1H, OH), 3.0 (dd, JH3,H4 =2.0 Hz, JH3,H1 =6.97 Hz, 1H, H-3 of azetidinone), 3.27 (t, J=6.58 Hz, 2H, CH2 N3), 3.8 (dd, JH4,H3 =2.0 Hz, JH4,H1 =6.55 Hz, 1H, H-4), 3.95 (m, 1H, H-1 of oxopropyl), 4.15 (m, 1H, CH3 CHO), 4.73 (m, 2H, CH2 of allyl), 5.3-5.4 and 5.9-6.1 (2×m, 2H and 1H, CH of allyl) and 6.0 ppm (broad s, 1H, NH).
Anal. Calcd. for C16 H22 N6 O5 : C, 50.79; H, 5.86; N, 22.21. Found: C, 50.87; H, 5.87; N, 22.31.
I. Allyl (2R,4R,5R,6S)-4-(4"-azidobutyl)-6-[(1'R)-1'-hydroxyethyl]-3,7-dioxo-1-azab icyclo[3.2.0]heptane-2-carboxylate ##STR199##
A solution of (3S,4R)-4-[(1"R)-1"-(4-azidobutyl)-3"-allyloxycarbonyl-3"-diazo-2"-oxoprop yl]-3-[(1'R)-1'-hydroxyethyl]azetidin-2-one (1.88 g, 4.97 mmol) in dry benzene (60 mL) was treated under nitrogen with rhodium (II) octanoate dimer (0.050 g) and heated under reflux (bath temperature 90°C) for 20 min. The solvent was then evaporated under vacuum to give the title bicyclic ketone as an oil:
IR (NaCl, film) νmax : 2100 (N3), 1762 (C═O of β-lactam) and 1745 cm-1 ;
1 H NMR (200 MHz, CDCl3) δ: 1.41 (d, J=6.26 Hz, 3H, CH2 CHO), 1.4-2.0 (m, 6H, CH2 -1,2 and 3 of butyl), 2.7 (m, 1H, H-4), 3.2-3.4 (m, 3H, H-6 and CH2 N3 overlapping), 4.28 (dd, JH5,H6 =2.37 Hz, JH5,H4 =8.15 Hz, 1H, H-5), 4.3 (m. overlapping with H-5, 1H, CH3 CHO), 4.65 (s, 1H, H-2), 4.66 (m, 2H, CH2 of allyl), 5.2-5.4 and 5.8-6.0 ppm (2×m, 2 and 1H, CH of allyl).
J. Allyl (4R,5S,6S)-4-(4"-azidobutyl)-6-[(1'R)-1-hydroxyethyl]-3-[pyridyl-3-yl)meth ylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate ##STR200##
A solution of allyl (2R,4R,5R,6S)-4-(4"-azidobutyl)-6-[(1'R)-1'-hydroxyethyl]-3,7-dioxo-1-azab icyclo[3.2.0]heptane-2-carboxylate (4.97 mmol), in dry CH3 CN (30 mL) was cooled to 0°-5°C and treated with diphenyl chlorophosphate (1.40 g, 5.21 mmol) and N,N-diisopropylethylamine (0.91 mL, 5.21 mmol) added simultaneously over 10 min. A small crystal of 4-N,N-dimethylaminopyridine was then added and the mixture was stirred for 1 h. Then, more N,N-diisopropylethylamine (1.3 mL, 7.4 mmol) was added, followed by 3-picolyl thiol (0.93 g, 7.4 mmol). The reaction mixture was then stirred at 0°-5°C for 4 h and then quenched by the addition of ethyl acetate (300 mL) and cold water. The organic phase was washed with pH 7.0 phosphate buffer, brine and dried (MgSO4). Evaporation of the solvent gave an oil which was chromatographed on silica gel (3.5×10 cm). Elution with ethyl acetate gave 1.41 g (62%) of the title compound as an oil:
IR (NaCl, film) νmax : 2100 (N3) 1770 (C═O of β-lactam) and 1705 m-1 (C═O of ester);
1 H NMR (200 MHz, CDCl3) δ: 1.38 (d, J=6.26 Hz, 3H, CH3 CHO), 1.3-2.0 (m, 6H, CH2 -1,2 and 3 of butyl), 3.1 (m, 1H, H-4), 3.16 (dd, JH6,H5 =2.72 Hz, JH6,H1 =7.33 Hz, 1H, H-6), 3.32 (t, J=6.0 Hz, 2H, CH2 N3), 4.02 (ABq, 2H, SCH2), 4.14 (dd, JH5,H6 =2.72 Hz, JH5,H4 =9.56 Hz, 1H, H-5), 4.22 (m, 1H, CH3 CHO), 4.75 (m, 2H, CH2 of allyl), 5.2-5.5 and 5.9-6.1 (2×m, 2H and 1H, CH of allyl), 7.3 (m, 1H, H-5 of pyridine), 7.7 (m, 1H, H-4 of pyridine) and 8.5 ppm (m, 2H, H-2 and H-6 of pyridine).
K. (4R,5S,6S)-4-(4"-Aminobutyl)-6-[(1'R)-1'-hydroxyethyl]-3-[pyridin-3-yl)met hylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR201##
A solution of allyl (4R,5S,6S)-4-(4"-azidobutyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(pyridin-3-yl)me thylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate (1.12 g, 2.45 mmol) in ethyl acetate (40 mL) was treated at 22°C and under nitrogen with tetrakis (triphenylphosphine) palladium [0] (0.050 g) and 5.4 mL (2.7 mmol) of a 0.5M solution of potassium 2-ethylhexanoate in ethyl acetate. After 20 min, the reaction mixture was extracted with cold water (3×20 mL) and the combined aqueous phase was maintained under vacuum to remove traces of organic solvent. The aqueous phase was then hydrogenated over 5% palladium on alumina (1.2 g) at 0°-5° C. and under 45 psi of hydrogen for 1.5 h (initial pH 6.8, final pH 9.6). After the addition of 20 mL of 0.2M pH 6.0 phosphate buffer, the catalyst was filtered and the filtrate was chromatographed on reversed phase silica gel (μBondapak C18, 3×14 cm). Elution with a gradient of acetonitrile (0-10%) in water gave 0.489 g (51%) of the title compound as a white amorphous powder after freeze drying: [α]D22 -3.5° (c 1.0, H2 O);
Purity by HPLC: 98.7% on μBondapak C18, 3.9 mm×30 cm, elution 5% CH3 CN--H2 O, pH 7.4 phosphate buffer, flow rate 1 mLin, UV detector 300 nm, retention time 9.6 min;
UV (H2 O, pH 7.4 phosphate buffer) νmax : 268 (5740) and 306 nm (8810);
IR (KBr) νmax : 1755 (C═O of β-lactam) and 1585 cm-1 (C═O of carboxylate);
1 H NMR (200 MHz, D2 O) δ: 1.29 (d, J=6.33 Hz, 3H, CH3 CHO), 1.2-1.8 (m, 6H, CH2 -1, 2 and 3 of butyl), 2.96 (t, J=7.6 Hz, 2H, CH2 N3), 3.15 (m, 1H, H-4), 3.29 (dd, JH6,H5 =2.54 Hz, JH6,H1 =6.36 Hz, 1H, H-6), 4.07 (ABq, JAB =14.2 Hz, Δν=24.3 Hz, 2H, SCH2), 4.07 (overlapping with SCH2, 1H, H-5), 4.22 (m, 1H, CH3 CHO), 7.44 (dd, JH5,H6 =4.95 Hz, JH5,H4 =7.9 Hz, 1H, H-5 of pyridine), 7.88 (m, 1H, H-4 of pyridine), 8.43 (dd, JH6,H5 =4.95 Hz, JH6,H4 =1.52 Hz, 1H, H-6 of pyridine) and 8.52 ppm (d, JH2,H4 =1.75 ppm, 1H, H-2 of pyridine).
(4R,5S,6S)-4-(4"-N-Formimidoylaminobutyl)-6-[(1'R)-1'-hydroxy-ethyl]-3-[(py ridin-3-yl)methylthio]-7-oxo-1-azabicyclo[3.2.0]-hept-2-ene-2-carboxylic acid ##STR202##
A solution of (4R,5S,6S)-4-(4"-aminobutyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(pyridin-3-yl)me thylthio]-7-oxo-1-azabicyclo-[3.2.0]hept-2-ene-2-carboxylic acid from Example 45 (0.175 g, 0.45 mmol) in cold (0°-5°C) water (15 mL) was adjusted to pH 8.5 with 1M NaOH. Then benzyl formimidate hydrochloride (0.38 g, 2.2 mmol) was added in small portions over 10 min while maintaining the pH to 8-8.5 with 1M NaOH. After another 20 min at 0°-5°C, 20 mL of 0.2M pH 6.0 phosphate buffer was added and the mixture was washed with EtOAc (20 mL). The aqueous phase was then maintained under vacuum to remove traces of organic solvent and chromatographed twice on reversed phase silica gel (μ-Bondapak C18, 2×14 cm) using a gradient of acetonitrile (0-5%) in water as eluent. Lyophilization of the UV active fractions gave 0.120 g (64%) of the title compound as a white amorphous solid: [α]D24 -3.2° (c 0.5, H2 O);
Purity by HPLC: 99% on μ-Bondapak c18, 3.9 mm×30 cm, elution 10% CH3 CN--H2 O pH 7.4 phosphate buffer, flow rate 2 mLin, UV detector 300 nm, retention time 6.44 min.
UV (H2 O, pH 7.4 phosphate buffer) λmax : 266 (6,300) and 304 nm (9,600);
IR (KBr) νmax : 1755 (C═O of β-lactam) 1715 and 1590 cm-1 (C═O of carboxylate);
1 H NMR (200 MHz, D2 O) δ: 1.28 (d, J=6.34 Hz, 3H, CH3 CHO), 1.2-1.8 (m, 6H, CH2 -1, 2 and 3 of butyl), 3.2 (m, 3H, H-6 and CH2 NH2), 4.07 (overlapping with SCH2, 1H, H-5), 4.07 (ABq, JAB =14.3 Hz, Δν=23.5 Hz, 2H, SCH2), 4.22 (m, 1H, CH3 C HO), 7.44 (m, 1H, H-5 of pyridine), 7.79 (s, 1H, C H═NH), 7.89 (m, 1H, H-4 of pyridine), 8.43 (m, 1H, H-6 of pyridine) and 8.52 ppm (m, 1H, H-2 of pyridine).
(4R,5S,6S)-4-(2"-Aminoethyl)-3-[(3-cyanopropyl)thio]-6-[(1'R)-1'-hydroxyeth yl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR203## A. Allyl (4R,5S,6S)-4-(2"-azidoethyl)-6-[(1'R)-1'-tert-butyldimethylsilyloxyethyl]- 3-(3-cyanopropyl)thio]-7-oxo-1-azabicyclo[3.2.0]hept-2ene-2-carboxylate ##STR204##
A solution of allyl (4R,5R,6S)-4-(2"-azidoethyl)-6-[(1'R)-1'-tert-butyldimethylsilyloxyethyl]- 3,7-dioxo-1-azabicyclo[3.2.0heptane-2-carboxylate (6.46 mmol, prepared by cyclization of 3.0 g, 6.46 mmol of the diazo precursor prepared in Example 2, Step E) in dry acetonitrile (50 mL) was treated at -15°C and under Argon with diphenyl chlorophosphate (1.4 mL, 6.75 mmol) and N,N-diisopropylethylamine (1.2 mL, 6.9 mmol) added simultaneously over 5 min. A small crystal of 4-N,N-dimethylaminopyridine was then added and the temperature of the mixture was slowly warmed to 0°-5°C over 30 min. N,N-Diisopropylethylamine (1.2 mL, 6.9 mmol) and 4-mercaptobutyronitrile (1.31 g, 13.0 mmol) [obtained from basic hydrolysis of an aqueous tetrahydrofuran solution of 4-acetylmercaptobutyronitrile (U.S. Pat. No. 3,223,585)] were added and the mixture was stirred at 0°-5°C for 4 h and overnight at -15°C The reaction mixture was then diluted with EtOAc (300 mL), washed with water, 1M NaHSO3, saturated NaHCO3, brine and dried (MgSO4). Evaporation of the solvent gave an oil which was chromatographed on silica gel (5×15 cm). Elution with a mixture of EtOAc and toluene (1:9) gave 2.62 g (78%) of the title compound as a brown oil:
IR (NaCl, film) νmax : 2250 (CN), 2100 (N3), 1775 (C═O of β-lactam) and 1710 cm-1 (C═O of ester).
1 H NMR (200 MHz, CDCl3) δ: 0.10 (s, 6H, SiCH3), 0.90 (s, 9H, Si-t-Bu) 1.31 (d, 3H, J=6.11 Hz, C H3 CHO), 1.7-2.12 (m, 4H, CH2 -4 and C H2 CH2 --CN), 2.4-3.12 (m, SH, CH2 --S, CH2 CN and H-6), 3.32-3.7 (m, 3H, CH2 N3 and H-4), 4.16 (dd, J4-5 =9.6 Hz, J5-6 =2.70 Hz, 1H, H-4), 4.21 (dd, J6-8 =7.47 Hz, J8-9 =6.2 Hz, CH3 C HO), 4.75 (m, 2H, CH2 of allyl), 5.20-6.50 and 5.96 (2×m, 2H and 1H, CH of allyl).
B. Allyl (4R,5S,6S)-4-(2"-azidoethyl)-3-[(3-cyanopropyl)thio]-6-[(1'R)-1'hydroxyeth yl]-7-oxo-1-azabicyclo-[3.2.0]hept-2-ene-2-carboxylate ##STR205##
A solution of allyl (4R,5S,6S)-4-(2"-azidoethyl)-6-[(1'R)-1'-tert-butyldimethylsilyloxyethyl]- 3-[(3-cyanopropyl)thio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate (2.48 g, 4.77 mmol) in dry tetrahydrofuran (75 mL) was treated at 0°-5°C and under Argon with acetic acid (1.64 mL, 28.6 mmol) followed by 14.9 mL (14.8 mmol) of 1M solution of tetrabutylammonium fluoride in tetrahydrofuran. The solution was stored at 5°C for 41 days. The reaction mixture was then diluted with EtOAc, washed with saturated NaHCO3, brine and dried (MgSO4). Evaporation of the solvent gave an oil which was chromatographed on silica gel (5×15 cm). Elution with a mixture of toluene and EtOAc (9:11) gave 0.91 g (37%, yield from the diazoazetidinone) of the title compound as a yellow oil:
IR (NaCl, film) νmax : 3500 (OH), 2250 (CN), 2100 (N3), 1775 (C═O of β-lactam) and 1705 cm-1 (C═O of carboxylate;
1 H NMR (200 MHz, CDCl3) δ: 1.40 (d, 3H, J=6.21 Hz, C H3 CHO), 1.6-2.15 (m, 4H, C H2 CH2 CN and CH2 -4), 2.55 (m, 2H, CH2 CN), 2.85-3.09 (m, 2H, SCH2), 3.18 (dd. 1H, J6-8 =7.84 Hz, J5-6 =2.66 Hz, H-6), 3.37-3.67 (m, 3H, H-4 and CH2 N3), 4.26 (m, overlapping with H-5, 1H, CH3 C HO), 4.26 (dd, J4,5 =9.70 Hz, J5-6 =2.61 Hz, 1H, H-5), 4.78 (m, 2H, CH2 of allyl), 5.24-5.30 and 5.96 (2×m, 2H and 1H, CH of allyl).
C. Sodium (4R,5S,6S)-4-(2"-azidoethyl)-3-[(3-cyanopropyl)thio]-6-[(1'R)-1'-hydroxyet hyl]-7-oxo-1-azabicyclo-[3.2.0]-hept-2-ene-2-carboxylate ##STR206##
A solution of allyl (4R,5S,6S)-4-(2"-azidoethyl)-3-[(cyanopropyl)thio]-6-[(1'R)-1'-hydroxyethy l]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate (900 mg, 2.22 mmol) in dry CH2 Cl2 (47 mL) was treated at 0°-5°C and under Argon, with tetrakis(triphenylphosphine)palladium [0] (123 mg) and 4.9 mL (2.44 mmol) of a 0.5M solution of sodium 2-ethylhexanoate in EtOAc. Then 190 mL of 0.1M phosphate buffer was added and the organic layer was separated. The organic phase was reextracted twice with 50 mL of water and the combined aqueous layers were pumped to remove organic solvent. Chromatography on reversed phase silica gel (Bondapak c-18, 7×10.5 cm) using gradient of acetonitrile in water (0-7%) followed by lyophilization of the UV active fractions gave 580 mg (66%) of the title compound slightly contaminated with sodium 2-ethylhexanoate. This material was used as such for the next step;
IR (NaCl, film) νmax : 2250 (CN), 2105 (N3), 1750 (C═O of β-lactam) and 1600 (C═O of carboxylate);
1 H NMR (200 MHz, D2 O) δ: 1.31 (d, J=6.40 Hz, 3H, CH3 CHO), 1.71-2.01 (m, 4H, CC H2 CH2 CN and CH2 -4), 2.73 and 2.74 (2t, J=6.94 and J=7.04, 2H, CH2 CN), 2.80-3.19 (m, 2H, SCH2), 3.35-3.67 (m, 4H, CC H2 N3, H-4 and H-6), 4.29-4.42 (m, 2H, H-5 and CH3 C HO).
D. (4R,5S,6S)-4-(2"-Aminoethyl)-3-[(3-cyanopropyl)thio]-6-[(1'R)-1'-hydroxyet hyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR207##
A solution of sodium (4R,5S,6S)-4-(2"-azidoethyl)-3-[(3-cyanopropyl)thio]-6-[(1'R)-1'-hydroxyet hyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate (250 mg, 0.64 mmol) in water was hydrogenated at 0°-5°C over 250 mg of 5% palladium on alumina and under 45 psi of hydrogen for 1 h. The catalyst was filtered and the filtrate was chromatographed on reversed phase silica gel (Bondapak c-18, 7×10.5 cm) using water as eluent. Lyophilization of the UV active fractions gave 18 mg (8%) of the title compound slightly contaminated with sodium 2-ethylhexanoate as a light yellow amorphous powder and 129 mg (59%) of the pure title compound as an off-white amorphous powder:
Purity by HPLC: 97% μ-Bondapak c-18, 3.9 mm×30 cm, elution 2% CH3 CN2 O pH 7.4 phosphate buffer, flow rate 1 mL/min, uv detector 302 nm, retention time 5.24 min;
UV (H2 O, pH7.4 phosphate buffer) λmax : 302 nm (5982);
IR (KBr) νmax : 2250 (CN), 1760 (C═O of β-lactam) and 1590 cm-1 (C═O of carboxylate);
1 H NMR (200 MHz, D2 O) δ: 1.33 (d, J=6.35 Hz, 3H, CH3 CHO), 1.75-2.30 (m, 4H, C H2 CH2 CN and CH2 -4), 2.63 (t, J=7.07 Hz, 2H, CH2 CN), 2.69-3.19 (m, 4H, SCH2 and CH2 NH2), 3.41 (m, overlapping with H-6, 1H, H-4), 3.44 (dd, J1'-6 =6.6 Hz, J5-6 =2.85 Hz, H-6), 4.21-4.33 (m, 2H, H-5 and CH3 C HO).
(4R,5S,6S)-6-[(1'R)-1'-Hydroxyethyl]-4-(2"-aminoethyl)-3-[(pyridin-4-yl)met hylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR208## A. Allyl (4R,5S,6S)-6-[(1'R)-1'-tert-butyldimethylsilyloxyethyl]-4-(2"-azidoethyl)- 3-[(pyridin-4-yl)methylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxyl ate ##STR209##
A cold (0°C) solution of allyl (4R,5R,6S)-6-[(1'R)-1'-(tert-butyldimethylsilyloxyethyl)]-4-(2"-azidoethyl )-3,7-dioxo-1-azabicyclo[3.2.0]heptane-2-carboxylate (4.7 g, 10.76 mmol) prepared as in Example 2 in CH3 CN (50 mL) was treated with diphenyl chlorophosphate (2.45 mL, 11.84 mmol) followed by N,N-diisopropylethylamine (2.06 mL, 11.84 mmol) and 4-N,N-dimethylaminopyridine (10 mg). The mixture was stirred at 0° for 2 h, under Argon, after which Argon was bubbled through the solution for 10 min. The enol-phosphate was then treated with 4-picolyl mercaptan (2.02 g, 16.15 mmol) in CH3 CN (10 mL) followed by N,N-diisopropylethylamine (2.81 mL, 16.15 mmol) and stirred at 0° C. for 3 hours. The reaction mixture was diluted with EtOAc (350 mL) and washed successively with cold 1M NaHSO3, 1M NaHCO3 and brine. The organic phase was dried (MgSO4) and solvent evaporated to a syrup which was chromatographed on silica (7.5×11 cm) packed in CH2 Cl2 and eluted with a mixture of CH2 Cl2 and EtOAc (8:2 gradient elution) to give the title compound as a syrup (2.28 g, 39%).
1 H NMR (200 MHz, CDCl3 7.24) δ: 0.04 (s, 3H, SiCH3), 0.06 (s, 3H, SiCH3), 0.86 (s, 9H, SiC(CH3)3), 1.27 (d, CH3, JCH3,1' =6.12 Hz), 1.63-1.76 (m, 1H, CH2), 1.93-2.05 (m, 1H, CH2), 3.02 (dd, H-6, J5,6 =2.68 Hz, J6,1' =7.91 Hz), 3.18-3.67 (overlapping, 3H, H-4, CH2 N3), 3.9-4.17 (overlapping, 4H, CHOH, H-5, SCH2), 4.6-4.85 (m, OCH2, allyl), 5.2-5.47 (m, ═CH2, allyl), 5.84-6.03 (m, CH═, allyl), 7.29 (A of A2 B2, H-3,5 py, J2,3 =5.98 Hz), 8.56 (B of A2 B2, H-2,6 py).
B. Allyl (4R,5S,6S)-6-[(1'R)-1'-hydroxyethyl]-4-(2"-azidoethyl)-3-[(pyridin-4-yl)me thylthio]-7-oxo-1-azabicyclo [3.2.0]hept-2-ene-2-carboxylate ##STR210##
A cold (0°C) solution of allyl (4R,5S,6S)-6-[(1'R)-1'-tert-butyldimethylsilyloxyethyl]-4-(2"-azidoethyl)- 3-[(pyridin-4-yl)methylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxyl ate (2.26 g, 4.16 mmol) in dry THF (35 mL) was treated, under Argon, with acetic acid (1.43 mL, 24.94 mmol) followed by a 1M solution of tetrabutylammonium floride in THF (12.47 mL, 12.47 mmol). The mixture was stirred between 0° and 5°C for 120 h and then neutralized at 0°C with a 1M NaHCO3 solution (25 mL, 25 mmol). The mixture was extracted with EtOAc (3×75 mL) and the combined organic phase was washed successively with a cold 1M NaHCO3 solution, H2 O and brine, dried (MgSO4) and solvent evaporated to give a sticky foam which was chromatographed on silica (4.5×11) packed in CH2 Cl2 and eluted first with a mixture of CH2 Cl2 and EtOAc (50 to 100% EtOAc) and then with a mixture of CH3 CN and EtOAc (1:1 gradient elution) to give the title compound as a foam (1.23 g, 69%).
1 H NMR (200 MHz, CDCl3 7.24) δ: 1.36 (d, CH3, JCH3,1' =6.23 Hz), 1.64-1.79 (m, 1H, CH2), 1.94-2.09 (m, 1H, CH2), 3.09 (dd, H-6, J5,6 =2.78 Hz, J6,1' =8.08 Hz), 3.19-3.65 (overlapping, 3H, H-4, CH2 N3), 3.88-4.23 (overlapping, 4H, CHOH, H-5, SCH2), 4.61-4.88 (m, OCH2, allyl), 5.21-5.47 (m, ═CH2, allyl), 5.85-6.04 (m, CHO, allyl), 7.28 (A of A2 B2, 2H, H-3,5, py, J2,3 =6.01 Hz), 8.56 (B of A2 B2, 2H, H-2,6; py).
C. Sodium (4R,5S,6S)-6-[(1'R)-1'-hydroxyethyl]-4-(2"-azidoethyl)-3-[(pyridin-4-yl)me thylthio]-7-oxo-1-azabicyclo-[3.2.0]hept-2-ene-2-carboxylate ##STR211##
To a cold (0°C) solution of allyl (4R,5S,6S)-6-[(1'R)-1'-hydroxyethyl]-4-(2"-azidoethyl)-3-[(pyridin-4-yl)me thylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate (1.23 g, 2.86 mmol) in CH2 Cl2 (25 mL), under Argon, was added Pd[Ph3 P]4 (0.3 g, 0.26 mmol) followed by a 0.5M solution of sodium 2-ethylhexanoate in EtOAc (5.73 mL, 2.86 mmol). The mixture was stirred at 0°C for 1 h and then extracted with water (3×25 mL). The combined aqueous phase was passed through a column of μ-Bondapak C-18 reverse phase silica (4.5×11 cm). The title compound was eluted with a mixture of water and CH3 CN (9:1, gradient elution) and was obtained as a fluffy solid after lyophilization (0.69 g, 58.5%).
1 H NMR (200 MHz, D2 O) δ: 1.29 (d, CH3, JCH3,1' =6.37 Hz), 1.6-1.78 (m, 1H, CH2), 1.93-2.09 (m, 1H, CH2), 3.14-3.58 (overlapping, 3H, H-4, CH2 N3), 3.4 (dd, H-6, J5,6 =2.64 Hz, J6,1' =6.22 Hz), 3.96-4.28 (overlapping, 4H, CHOH, H-5, SCH2), 7.5 (A of A2 B2, H-3,5, py, J2,3 =5.35 Hz), 8.49 (br s, B of A2 B2, H-2,6, py).
D. (4R,5S,6S)-6-[(1'R)-1'-Hydroxyethyl]-4-(2"-aminoethyl)-3-[(pyridin-4-yl)me thylthio]-7-oxo-1-azabicyclo[3.2-0]hept-2-ene-2-carboxylic acid ##STR212##
A solution of sodium (4R,5S,6S)-6-[(1'R)-1'-hydroxyethyl]-4-(2"-azidoethyl)-3-[(pyridin-4-yl)me thylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate (0.16 g, 0.39 mmol) in 40 mL of a 0.05M pH 7 phosphate buffer was hydrogenated at 45 psi over 5% Pd on alumina (0.32 g) at 0°C for 1 h. After removing the catalyst, the filtrate was passed through a column of μ-Bondapak C-18 reverse phase silica (4.5×11 cm). The title compound was eluted with a mixture of water and CH3 CN (95:5, gradient elution) and was obtained as a fluffy solid after lyophilization (0.044 g, 31.4%).
Purity by HPLC: 95.9%; UV detection at 302 nm on μ-Bondapak C-18 (4 mm×30 cm), 10% CH3 CN in pH 7.4 phosphate buffer, flow rate 1 mLin, retention time 7.24 min.
IR (nujol) νmax : 1750 cm-1 (C═O, β-lactam).
1 H NMR (D2 O, 200 MHz) δ: 1.31 (d, CH3, JCH3,1' =6.35 Hz), 1.65-1.85 (m, 1H, CH2), 2.04-2.22 (m, 1H, CH2), 3.04 (t, 2H, CH2 NH2), 3.19 (dt, H-4, J4,5 =10.05, J=3.44 Hz), 3.4 (dd, H-6, J5,6 =2.8 Hz, J6,1' =6.52 Hz), 3.99, 4.13 (AB, SCH2, Jgem 14.39 Hz), 4.11 (dd, H-5), 4.24 (m, H-1'), 7.46 (A of A2 B2, H-3,5, py, J2,3 =6.1 Hz), 8.49 (B of A2 B2, H-2-6, py).
(4R,5S,6S)-3-[(2-Cyanoethyl)thio]-6-[(1'R)-1'-hydroxyethyl]-4-[2"-(N-morpho lino)ethyl)-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR213##
A. Allyl (4R,5S,6S)-4-(2"-tert-butyldimethylsilyloxyethyl)-6-[(1'R)-1'-tert-butyldi methylsilyloxyethyl]-3-[(2-cyanoethyl)-thio]-7-oxo-1-azabicyclo[3.2.0]hept- 2-ene-2-carboxylate ##STR214##
A cold (ice-methanol bath) solution of allyl-(2 R,4 R,5 R,6 S)-4-(2"- tert-butyldimethylsilyloxyethyl)-6-[(1'R)-1'-tert-butyldimethylsilyloxyeth yl]-3,7-dioxo-1-azabicyclo[3.2.0]heptane-2-carboxylate in CH3 CN (160 mL) obtained from the corresponding (3 S,4 R)-3-[(1' R)-1'- tert-butyldimethylsilyloxyethyl]-4-[(1" R)-1"-(2- tert-butyldimethylsilyloxyethyl)-3"-diazo-3"-allyloxycarbonyl-2"-oxopropyl ]azetidin-2-one (15.0 g, 27.0 mmol) was treated successively with diphenyl chlorophosphate (6.2 mL, 30 mmol) and dropwise with N,N-diisopropylethylamine (5.2 mL, 30 mmol) and 4-dimethylaminopyridine (20 mg). The mixture was stirred for 1 h and the resulting enol phosphate was treated with 2-cyanoethanethiol (2.9 g, 33.8 mmol) and N,N-diisopropylethylamine (5.8 mL, 33.8 mmol). The mixture was stirred for 30 min and it was treated twice at 30 min interval with 2-cyanoethane-thiol (600 mg, 6.7 mmol×2) and N,N-diisopropylethylamine (1.16 mL, 6.76 mmol×2). The mixture was diluted with ethyl acetate (400 mL), washed with ice cold water (3×100 mL), ice cold 1M aqueous NaHSO3 (100 mL), ice cold 1N aqueous HCl (100 mL), water (100 mL), cold 1M aqueous NaHCO3 (100 mL), ice cold water (100 mL×2), brine (100 mL) and dried (MgSO4). The mixture was passed through a silica gel flash pad (250 g, Hexane→15% ethyl acetateexane) to give the title compound (11.5 g, 71.6%) as a solid;
IR (neat) νmax : 2250 (C═N), 1775 and 1710 cm-1 (C═O);
1 H NMR (CDCl3, 200 MHz) δ: 6.05-5.85 (1H, m, vinylic H), 5.49-5.21 (2H, m, vinylic H), 4.9-4.55 (2H, m, allylic CH2), 4.27-4.18 (2H, m, H-1' and H-5), 4.195 (part of H-5, d, J=2.6 Hz), 3.89-3.75 (1H, m, HC H--OSi), 3.60-3.45 (2H, m, H-4 and HCH--OSi), 3.35-3.22, 3.12-2.93 (2H, 2 sets of m, SCH2), 3.102 (1H, dd, J=2.5 Hz, J=6.3 Hz, H-6), 2.70-2.60 (2H, m, CH2 --CN), 2.04-1.90, 1.80-1.60 (2H, 2 sets of m, CH2 -4), 1.267 (3H, d, J=6.1 Hz, CH3), 0.907 and 0.887 (18H, 2s, tert-butyl), 0.084 and 0.074 ppm (12H, 2s, dimethyl).
B. Allyl (4R,5S,6S)-6-[(1'R)-1'-tert-butyldimethylsilyloxyethyl]-3[(2-cyanoethyl)th io]-4-(2"-hydroxyethyl)-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate ##STR215##
A cold (ice-methanol bath) of allyl (4 R,5 S,6 S)-4-(2"- tert-butyldimethylsilyloxyethyl]-6-[(1'R)-1'-tert-butyldimethylsilyloxyeth yl]-3-[(2-cyanoethyl)thio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylat e (2.0 g, 3.36 mmol) in anhydrous tetrahydrofuran (20 mL) was treated successively with glacial acetic acid (2.2 mL, 40 mmol) and dropwise with a 1M solution of tetrabutylammonium fluoride in tetrahydrofuran (20 mL, 20 mmol). The mixture was stirred for 1 h and then was allowed to react at 5°C (cold room) for 18 h. The mixture was poured on ice cold saturated NaHCO3 (50 mL) and extracted with ethyl acetate (4×25 mL). The organic layers were combined, washed with ice cold water (25 mL), ice cold 1M aqueous NaHCO3 (2×25 mL), water (2×25 mL), brine (25 mL) and dried (MgSO4). The mixture was passed through a silica gel flash pad (50 g, CH2 Cl2 →10, 20, 30, 40% EtOAcH2 Cl2) to give the title compound (1.0 g, 62%) as a semi-solid;
IR (Neat) νmax : 3600-3200 (OH), 2250 (C═N), 1770 and 1710 cm-1 (C═O);
1 H NMR (CDCl3, 200 MHz) δ: 6.03-5.86 (1H, m, vinylic --H), 5.50-5.22 (2H, m, vinylic H), 4.80-4.66 (2H, m, allylic CH2), 4.222 (1H, dd, J=2.7 Hz, J=9.8 Hz, H-5), 4.25-4.19 (1H, m, H-1'), 3.95-3.82, 3.75-3.65 (2H, 2 sets of m, CH2 O), 3.59-3.48 (1H, m, H-4), 3.31-3.16, 3.09-2.94 (2H, 2 sets of m, S--CH2), 3.184 (1H, dd, J=2.6 Hz, J=6.9 Hz, H-6), 2.74-2.66 (2H, m, CH2 --CN), 2.15-1.95, 1.90-1.70 (2H, 2 sets of m, CH2 -4), 1.56 (1H, s, OH), 1.290 (3H, d, J=6.2 Hz, CH3), 0.891 (9H, s, tert-butyl) and 0.090 ppm (6H, s, dimethyl).
C. Allyl (4R,5S,6S)-6-[(1'R)-1'-tert-butyldimethylsilyloxyethyl]-3-[(2-cyanoethyl)t hio]-4-[2"-(N-morpholino)ethyl]-7-oxo-1-azabicyclo[3.2∅]hept-2-ene-2-carb oxylate ##STR216##
A cold solution (dry ice-acetone) of allyl (4 R,5 S,6 S)-6-[(1' R)-1'- tert-butyldimethylsilyloxyethyl]-3-[(2-cyanoethyl)thio]-4-(2"-hydroxyethyl )-7-oxo-1-azabicyclo[3.2-0]hept-2-ene-2-carboxylate (312 mg, 0.650 mmol) in CH2 Cl2 (8 mL) was treated with N,N-diisopropylethylamine (200 μL, 1.72 mmol) and dropwise with trifluoromethanesulfonic anhydride (130 μl, 0.773 mmol). The mixture was stirred for 30 min and then morpholine (350 μl, 4.01 mmol) was added on. The dry-ice bath was removed and was replaced by an ice bath. The mixture was stirred for 3 h after which it was applied directly on a silica gel column (15 g, hexane→hexanetOAc→CH3 CN) to give the title compound (420 mg, 100%) as an oil;
IR (neat) νmax : 1775 and 1710 cm-1 (C═O);
1 H NMR (CDCl3, 200 MHz) δ: 6.04-5.84 (1H, m, vinylic-H), 4.85-4.62 (2H, m, allylic-CH2), 4.192 (1H, dd, J=2.2 Hz, J=11.8 Hz, H-5), 4.29, 4.26, 4.20 (1H, m, part of H-1'), 3.70 (4H, bs, CH2 OCH2), 3.35-3.16 (3H, m, H-4, H-6, HCHS), 3.03-2.89 (1H, m, HC HS), 2.72-2.55 (2H, m, CH2 CN), 2.52-2.22 (6H, m, (CH2)3 N), 1.98-1.86 (1H, m, C H-4), 1.69-1.48 (1H, m, C H-4), 1.279 (3H, d, J=6.1 Hz, CH3), 0.877 (9H, s, tert-butyl) and 0.076 (6H, s, dimethyl).
D. Allyl (4R,5S,6S)-3-[(2-cyanoethyl)thio]-6-[(1'R)-1'-hydroxyethyl]-4-[2"-(N-morph olino)ethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate ##STR217##
A cold solution (ice-MeOH bath) of allyl (4 R,5 S,6 S)-6-[(1' R)-1'- tert-butyldimethylsilyloxyethyl]-3-[(2-cyanoethyl)thio]-4-[2"-(N-morpholin o)ethyl]-7-oxo-1-azabicyclo-[3.2.0]hept-2-ene-2-carboxylate (420 mg, 764 mmol) in THF (8 mL) was treated first with acetic acid (560 μl, 9.78 mmol) and dropwise with a 1M solution of tetrabutylammonium fluoride in THF (4.55 mL, 4.55 mmol). The mixture was stirred for 30 min and the ice-MeOH bath was replaced by an ice bath. The mixture was then allowed to set in a cold room (5°C) for 210 h. Then solid NaHCO3 (600 mg) was added in and the mixture was stirred for 30 min and then applied on 4 preparative TLC plates (2 mm, CH3 CN) to give pure title compound (325 mg, 97%, Rf =0.2) but contaminated with some tetrabutylammonium salt;
IR (nujol) νmax : 3600-3200 (OH), 1770 and 1710 cm-1 (C═O);
1 H NMR(CDCl3, 200 MHz) δ: 6.04-5.87 (1H, m, vinylic H), 5.49-5.24 (2H, m, vinylic H), 4.88-4.64 (2H, m, allylic CH2), 4.276 (1H, dd, J=2.8 Hz, J=9.8 Hz, H-5), 4.3-4.1 (1H, m, H-1'), 3.76-3.7 (4H, bm, CH2 OCH2), 3.45-3.31 (1H, m, H-4), 3.269 (1H, dd, J=2.9 Hz, J=8.0 Hz, H-6), 3.25-3.16, 3.03-2.90 (2H, 2 sets of m, SCH2), 2.72-2.35 (8H, CH2 CN, (CH2)3 N), 2.1-1.9 and 1.8-1.6 (2H, 2 sets of m, CH2) and 1.388 ppm (3H, d, J=6.2 Hz, CH3).
E. (4R,5S,6S)-3-[(2-Cyanoethyl)thio]-6-[(1'R)-1'-hydroxyethyl]-4-[2"-(N-morph olino)ethyl]-7-oxo-1-azabicyclo-[3.2.0]-hept-2-ene-2-carboxylic acid ##STR218##
To a cold (ice bath) solution of allyl (4 R,5 S,6 S)-3-[(2-cyanoethyl)thio]-6-[(1' R)-1'-hydroxyethyl]-4-[2"-(N-morpholino)ethyl]-7-oxo-1-azabicyclo[3.2.0]he pt-2-ene-2-carboxylate (321 mg, 0.737 mmol) in CH2 Cl2 (6 mL) was added Pd(PPh3)4 (14 mg) and a 0.5M solution of potassium ethyl-2-hexanoate (1.5 mL, 0.75 mmol). The ice bath was removed and the mixture was stirred for 1 h. More Pd(PPh3)4 was added and stirring was continued for 1 h. It was diluted with diethyl ether and extracted with a 0.05M aqueous pH 7.0 buffer and a pH 7.4 buffer. The aqueous mixture extracted was combined, washed with diethyl ether and passed through a reversed phase μ-Bondapak C18 column (H2 O, 2%→4% CH3 CN2 O) to give the title compound (179 mg, 61.4%) as a lyophilized powder;
Purity by HPLC: 99.7% (300 nm);
UV (H2 O) λmax : 300 (7900);
IR (Nujol) νmax : 1750 and 1600 cm-1 (C═O);
1 H NMR (D2 O, 200 MHz) δ: 4271 (1H, dd, J=2.7 Hz, J=6.8 Hz, H-5), 4.4-4.22 (1H, m, H-1'), 3.84-3.80 (4H, m, CH2 OCH2), 3.424 (1H, dd, J=2.7 Hz, J=6.3 Hz, H-6), 3.43-3.33 (1H, m, H-4), 3.21-3.08, 3.01-2.90 (2H, 2 sets of m, SCH2), 2.90-2.6 (8H, m, CH2 CN, (CH2)3 N), 2.2-2.0, 1.90-1.70 (2H, 2 sets of m, CH2) and 1.336 (3H, d, J=6.3 Hz, CH3).
(4R,5S,6S)-4-(3"-Aminopropyl)-3-[(3-cyanopropyl)thio]-6-[(1'R)-1'-hydroxyet hyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR219## A. Allyl (4R,5S,6S)-4-(3"-azidopropyl)-3-[(3-cyanopropyl)thio]-6-[(1'R)-1'-hydroxye thyl]-7-oxo-1-azabicyclo-[3.2.0]hept-2-ene-2-carboxylate ##STR220##
A cold solution (ice-MeOH bath) of allyl (2 R,4 R,5 S,6 S)-4-(3"-azidopropyl)-6-[(1'R )-1'-hydroxyethyl]-3,7-dioxo-1-azabicyclo[3.2.0]heptan-2-carboxylate, prepared from (3 S, 4 R)-3-[(1' R)-1'-hydroxyethyl]-4-[(1' R)-1"-(3-azidopropyl)-3"-diazo-3"-allyloxycarbonyl-2"-oxopropyl]azetidin-2 -one (2.00 g, 5.49 mmol), as prepared in Example 21, in CH3 CN (40 mL) was treated dropwise with diphenyl chlorophosphate (1.2 mL, 6.0 mmol) and N,N-diisopropylethylamine (1.03 mL, 6.00 mmol) and a trace of 4-N,N-dimethylaminopyridine. The mixture was stirred for 30 min and the resulting enolphosphate was treated dropwise with cyanopropyl mercaptan (693 mg, 6.86 mmol) and N,N-diisopropylethylamine (1.19 mL, 6.90 mmol). The mixture was stirred for 1 h, then the ice-MeOH bath was replaced by an ice bath and stirring was pursued for 2 more hours. Then more cyanopropyl mercaptan (280 mg, 2.74 mmol) and N,N-diisopropylethylamine (0.480 mL, 2.74 mmol) were added then followed by a stirring period of 18 h at 5°C (cold room). More thiol (280 mg, 2.74 mmol) and N,N-diisopropylethylamine (0.480 mL, 2.74 mmol) were added and stirring was continued for 3 h after which, the mixture was diluted with ethyl acetate (100 mL), washed with cold 1M aqueous NaHSO3 (2×40 mL), water (40 mL), 1N aqueous HCl (40 mL), water (40 mL), 1M aqueous NaHCO3 (40 mL), water (40 mL), brine (40 mL) and dried (MgSO4). The residue was passed through a silica gel flash column (75 g, EtOAcexane: 1/3→EtOAc) to give the title compound (1.33 g, 59%) as an oil;
IR (CH2 Cl2) νmax : 3600-3500 (OH), 2250 (CN), 2100 (N3), 1780 and 1710 cm-1 (C═O);
1 H NMR (CDCl3, 200 MHz) δ: 6.04-5.87 (1H, m, vinylic-H), 5.50-5.23 (2H, m, vinylic-H), 4.89-4.63 (2H, m, allylic CH2), 4.29-4.20 (1H, m, H-1'), 4.248 (1H, dd, J=2.7 Hz, J=9.5 Hz, H-5), 3.50-3.35 (2H, m, CH2-- N3), 3.267 (1H, dd, J=2.7 Hz, J=7.6 Hz, H-6), 3.30-3.20 (1H, m, H-4), 3.05-2.85 (2H, m, SCH2), 2.59-2.51 (2H, m, CH2 CN), 2.06-1.93 (2H, CH2 CH2 CH2 CN), 1.93-1.57 (4H, CH2 -- CH2 --CH2 N3), 1.76 (1H, d, J=3.7 Hz, OH) and 1.393 ppm (3H, d, J=6.3 Hz, CH3).
B. (4R,5S,6S)-4-(3"-Aminopropyl)-3-[(-cyanopropyl)thio]-6-[(1'R)-1'-hydroxyet hyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR221##
A cold (ice bath) solution of allyl (4 R,5 S,6 S)-4-(3"-azidopropyl)-3-[(3-cyanopropyl)thio]-6-[(1' R)-1'-hydroxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate (100 mg, 0.240 mmol) in CH2 Cl2 (10 mL) was treated with Pd(PPh3)4 (220 mg, 0.018 mmol) followed by the dropwise addition of a 0.5M solution of sodium ethyl-2-hexanoate (0.48 mL, 0.24 mmol) in EtOAc. The mixture was stirred for 1.5 h, then diluted with diethyl ether (20 mL) and extracted with water (3×3 mL) and a 0.05M solution of a pH 8.0 phosphate buffer (3×3 mL). The aqueous extracts were combined, washed with diethyl ether (2×5 mL) and then treated at 5°C (ice bath) at 45-50 psi of hydrogen for 1.25 h using 5% Pdlumina (100 mg) as catalyst. The catalyst was removed by filtration, washed with water (2×2 mL) and the aqueous solution was passed through a μ-Bondapak C18 column (25 g, H2 O→1%, 2% CH3 CN/H2 O) to give the title compound (65 mg, 77%) as a white lyophilized powder;
Purity by HPLC: 99.9% (300 nm);
UV (H2 O) λmax : 302 (ε8000);
IR (Nujol) νmax : 2250 (CN), 1760 and 1595 cm-1 (C═O);
1 H NMR (D2 O, 200 MHz) δ: 4.34-4.32 (2H, m, H-1' and H-5), 4.239, 4.226 (d, J=2.6 Hz, part of H-5), 3.42-3.33 (1H, m, H-4), 3.383 (1H, dd, J=2.7 Hz, J=6.2 Hz, H-6), 3.09-2.94 (3H, m, CH2 N and S- HCH), 2.85-2.74 (1H, m, SH CH), 2.70-2.61 (2H, m, CH2 CN), 2.10-1.49 (6H, m, CH2 CH2 CH2 CN, CH2 CH2) and 1.334 ppm (3H, d, J=6.4 Hz, CH3).
(4R,5S,6S)-4-[3"-(N-Formimidoyl)aminopropyl]-3-[(3-cyanopropyl)thio]-6-[(1' R)-1'-hydroxyethyl]-7-oxo-1-azabicyclo [3.2.0]hept-2-ene-2-carboxylic acid ##STR222##
A cold solution (ice bath) of (4 R,5 S,6 S)-4-(3"-aminopropyl)-3-[(3-cyanopropyl)thio]-6-[(1' R)-1'-hydroxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid (150 mg, 0.420 mmol) in a 0.04M pH 7.0 phosphate buffer (25 mL) was treated first with a 0.1M aqueous NaOH solution (to raise and maintain the pH to 8-8.4) and portionwise with benzyl formimidate hydrochloride (720 mg, 4.2 mmol). The mixture was stirred for 10 min and the pH of the solution lowered to 7.0 with a 0.1N aqueous HCl solution. The mixture was then passed through a μ-Bondapak C18 column (twice, 30 g and 60 g, H2 O→1%, 2%, 3%, 4% CH3 CN2 O) to give the title compound (117 mg, 73%) as a lyophilized powder;
Purity by HPLC: 94.4% (300 nm);
UV (H2 O) λmax : 302 (ε9100);
IR (Nujol) νmax : 2250 (CN), 1755 (C═O), 1715 (C═N) and 1590 cm-1 (C═O);
1 H NMR (D2 O, 200 MHz) δ: 7.83, 7.81 (1H, 2s, CH), 4.34-4.22 (2H, m, H-1' and H-4), 4.231 (d, J=2.9 Hz, part of H-4), 3.49-3.32 (4H, m, H-4, H-6 and CH2 N), 3.06-2.92, 2.84-2.74 (2H, 2 sets of m, SCH2), 2.70-2.61 (2H, m, CH2 CN), 2.10-1.47 (6H, CH2 CH2 CH2 CN, CH2 --CH2) and 1.323 ppm (3H, d, J=6.4 Hz, CH3).
(4R,5S,6S)-4-(4"-Aminobutyl)-3-[(3-cyanopropyl)thio]-6-[(1'R)-1'-hydroxyeth yl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR223## A. Allyl (4R,5S,6S)-4-(4"-azidobutyl)-3-[(3-cyanopropyl)thio]-6-[(1'R)-1'-hydroxyet hyl]-7-oxo-1-azabicyclo-[3.2.0]hept-2-ene-2-carboxylate ##STR224##
A solution of allyl (4R,5R,6S)-4-(4"-azidobutyl)-6-[(1'R)-1'-hydroxyethyl]-3,7-dioxo-1-azabicy clo[3.2.0]heptane-2-carboxylate (6.71 mmol, prepared by cyclization of 1.54 g, 6.71 mmol of the diazo precursor as described in Example 45) in dry acetonitrile (40 mL) was treated at 0°-5°C and under nitrogen with diphenyl chlorophosphate (1.53 mL, 7.4 mmol) and N,N-diisopropylethylamine (1.3 mL, 7.5 mmol) added simultaneously over 5 min. A small crystal of 4-N,N-dimethylaminopyridine was then added and the mixture was stirred for 1 h. Then N,N-diisopropylethylamine (1.75 mL, 10.0 mmol) followed by 4-mercaptobutyronitrile (1.01 g, 10.0 mmol) [from basic hydrolysis of 4-acetylmercaptobutyronitrile (U.S. Pat. No. 3,223,585)] were added and the mixture was stirred at 0°-5°C for 18 h. The reaction mixture was then diluted with EtOAc (300 mL) washed with water, saturated NaHCO3, pH 7.0 phosphate buffer and brine and dried (MgSO4). Evaporation of the solvent gave an oil which was chromatographed on silica gel (4.5×11 cm) using a gradient of EtOAc in toluene (8:2 to 1:1) to give 2.14 g (73%) of the title compound as an oil:
IR (NaCl, film) νmax : 2250 (CN), 2100 (N3), 1772 (C═O of β-lactam) and 1710 cm-1 (C═O of ester);
1 H NMR (200 MHz, CDCl3) δ: 1.39 (d, J=6.25 Hz, 3H, CH3 CHO), 1.4-2.1 (m, 8H, CH2 -1,2 and 3 of butyl and CH2 -2 of cyanopropylthio), 2.55 (m, 2H, C H2 CN), 2.8-3.1 (m, 2H, S CH2), 3.2 (dd, JH6,H5 =2.70 Hz, JH6,H1 =7.22 Hz, 1H, H-6), 3.2 (m, overlapping with H-6, 1H, H-4), 3.33 (t, J=6.1 Hz, 2H, C H2 N3), 4.25 (dd, JH5,H6 =2.70 Hz, JH5,H4 =9.49 Hz, 1H, H-5), 4.75 (m, 2H, CH2 of allyl), 5.2-5.5 and 5.9-6.1 ppm (2×m, 2H and 1H, CH of allyl).
B. (4R,5S,6S)-4-(4"-Aminobutyl)-3-[(3-cyanopropyl)thio]-6-[(1'R)-1'-hydroxyet hyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR225##
A solution of allyl (4R,5S,6S)-4-(4"-azidobutyl)-3-[(3-cyanopropyl)thio]-6-[(1'R)-1'-hydroxyet hyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate (1.86 g, 4.3 mmol) in dry EtOAc (80 mL) was treated at 24°C and under nitrogen with tetrakis(triphenylphosphine) palladium [0] (0.10 g) and 9.5 mL (4.75 mmol) of a 0.5M solution of potassium 2-ethylhexanoate in EtOAc. After 30 min, the reaction mixture was extracted with water (2×75 mL) and the combined aqueous phase was hydrogenated over 2.4 g of 5% palladium on alumina at 0°-5°C under 45 psi of hydrogen for 1 h. Then 40 mL of 0.2M pH 6.0 phosphate buffer were added immediately (initial pH 10.5, final pH 6.9). The catalyst was filtered and the filtrate was chromatographed twice on reverse phase silica gel (μ-Bondapak C-18, 3.5×11 cm) using a mixture of acetonitrile and water (5:95) as eluent. Lyophilisation of the UV active fractions gave 0.839 g (53%) of the title compound as a white amorphous solid;
Purity by HPLC: 99% on μ-Bondapak C-18, 3.9 mm×30 cm, 5% CH3 CN--H2 O pH 7.4 phosphate buffer, flow rate 1 mLin, UV detector 300 nm, retention time 7.89 min;
UV (H2 O, pH 7.4 phosphate buffer) νmax : 302 nm (9,528);
IR (KBr) νmax : 2250 (CN), 1755 (C═O of β-lactam) and 1590 cm-1 (C═O of carboxylate);
1 H NMR (200 MHz, D2 O) δ: 1.32 (d, J=6.37 Hz, 3H, CH3 CHO), 1.3-2.1 (m, 8H, CH2 -1,2 and 3 of butyl and CH2 -2 of cyanopropylthio), 2.64 (t, J=7.0, Hz, 2H, CH2 CN), 2.6-3.1 (m, 2H, SCH2), 3.0 (t, J-7.6 Hz, 2H, CH2 NH2), 3.3 (m, overlapping with H-6, 1H, H-4), 3.35 (dd, JH6,H5 =2.46 Hz, JH6,H1 =6.39 Hz, 1H, H-6), 4.22 (dd, JH5,H6 =2.46 Hz, JH5,H4 =6.83 Hz, 1H, H-5) and 4.26 ppm (m, 1H, CH3 CHO).
(4R,5S,6S)-4-(4"-Aminobutyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(pyridin-4-yl)met hylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR226## A. Allyl (4R,5S,6S)-4-(4"-azidobutyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(pyridin-4-yl)me thylthio]-7-oxo-1-azabicyclo [3.2.0]hept-2-ene-2-carboxylate ##STR227##
A solution of allyl (4R,5R,6S)-4-(4"-azidobutyl)-6-[(1'R)-1-hydroxyethyl]-3,7-dioxo-1-azabicyc lo[3.2.0]heptane-2-carboxylate (5.28 mmol, prepared by cyclization of 2.0 g of the diazo precursor as described in Example 45) in dry acetonitrile (35 mL) was treated at 0°-5°C and under nitrogen with diphenyl chlorophosphate (1.49 g, 5.5 mmol) and N,N-diisopropylethylamine (0.97 mL, 5.5 mmol) added simultaneously over 5 min. A small crystal of 4-N,N-dimethylaminopyridine was then added and the solution was stirred for 1 h. Then more N,N-diisopropylethylamine (1.4 mL, 7.9 mmol) followed by 4-picolyl mercaptan (1.0 g, 7.9 mmol) were added and the mixture was stirred at 0°-5°C for 3 h. The reaction mixture was quenched by addition of EtOAc (300 mL) and 0.2M pH 7.0 phosphate buffer. The organic phase was washed with brine, dried (MgSO4) and concentrated. The residue was chromatographed on silica gel (3.5×13 cm) using EtOAc as eluent and gave 1.89 g (78%) of the title compound as a clear oil:
IR (NaCl, film) νmax : 2100 (N3), 1770 (C═O of β-lactam) and 1710 cm-1 (C═O of ester);
1 H NMR (200 MHz, CDCl3) δ: 1.37 (d, J=6.27 Hz, 3H, CH3 CHO), 1.3-1.9 (m, 6H, CH2 -1,2 and 3 of butyl), 3.02 (m, 1H, H-4), 3.14 (dd, JH6,H5 =2.65 Hz, JH6,H1 =7.41 Hz, 1H, H-6), 3.31 (t, J=6.1 Hz, CH2 N3), 3.98 (ABq, JAB =14.22 Hz, Δν15.7 Hz, 2H, SCH2), 4.21(m, 1H, CH3 CHO, 4.76 (m, 2H, CH2 of allyl), 5.2-5.5 and 5.9-6.1 (2×m, 2H and 1H, CH of allyl), 7.27 (∼d, 2H, H-3 of pyridyl) and 8.57 ppm (∼d, 2H, H-2 of pyridyl).
B. (4R,5S,6S)-4-(4"-Aminobutyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(pyridin-4-yl)me thylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR228##
A solution of allyl (4R,5S,6S)-4-(4"-azidobutyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(pyridin-4-yl)me thylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate (1.80 g, 3.9 mmol) in EtOAc (50 mL) was treated at 22°C and under nitrogen with tetrakis(triphenylphosphine) palladium [0] (0.1 g) and 8 mL (4.0 mmol) of a 0.5M solution of potassium 2-ethylhexanoate in EtOAc. After 30 min, the reaction mixture was extracted with water (3×50 mL) and the combined aqueous extract was hydrogenated over 2.3 g of 5% palladium on alumina at 0°-5°C and under 45 psi of hydrogen for 1 h. Then 50 mL of cold 0.2M pH 6.0 phosphate buffer were added (initial pH 10.5, final pH 6.7) and the catalyst was filtered. The filtrate was then chromatographed on reversed phase silica gel (μ-Bondapak c-18, 3×14 cm) using a gradient of acetonitrile (0-5%) in water as eluent.
The first fractions gave, after lyophilisation, 0.050 g (4%) of (4R,5S,6S)-4-(4"-hydroxybutyl)-6-[(1'-hydroxyethyl]-3-[(pyridin-4-yl)methy lthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate (mixture of Na and K salt) as a white solid.
The following fractions gave 0.830 g (54%) of the title compound as a white amorphous solid: [α]D22 -9.5° (c 1.0 H2 O);
Purity by HPLC: 97.8% on μ-Bondapak C-18, 3.9 mm×30 cm, 5% CH3 CN--H2 O pH 7.4 phosphate buffer, flow rate 2 mLin, UV detector 300 nm, retention time 7.42 min;
UV (H2 O, pH 7.4 phosphate buffer) λmax : 262 (5,195) and 304 nm (8,370);
IR (KBr) νmax : 1755 (C═O of β-lactam) and 1600 cm-1 (C═O of carboxylate);
1 H NMR (200 MHz, D2 O) δ: 1.29 (d, J=6.37 Hz, 3H, CH3 CHO), 1.2-1.8 (m, 6H, CH2 -1,2 and 3 of butyl), 2.94 (t, J=7.5 Hz, CH2 NH2), 3.10 (m, 1H, H-4), 3.28 (dd, JH6,5 =2.53 Hz, JH6,H1 =6.30 Hz, 1H, H-6), 4.05 (m, 3H, H-5 and SCH2 overlapping), 4.21 (m, 1H, CH3 C HO), 7.48 (∼d, 2H, H-3 of pyridine), and 8.49 ppm (∼d, 2H, H-2 of pyridine).
(4R,5S,6S)-4-(4"-N-Formimidoylaminobutyl)-6-[(1'R)-1'-hydroxy-ethyl]-3-[(py ridin-4-yl)methylthio]-7-oxo-1-azabicyclo[3.2.0]-hept-2-ene-2-carboxylic acid ##STR229##
A solution of (4R,5S,6S)-4-(4"-aminobutyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(pyridin-4-yl)me thylthio]-7-oxo-1-azabicyclo[3.2.0]hept2-ene-2-carboxylic acid (0.318 g, 0.81 mmol) in cold (0°-5°C) water (25 mL) was adjusted to pH 8.5 with 1N NaOH. Then benzyl formimidate hydrochloride (0.70 g, 4.06 mmol) was added in small portions over 10 min while maintaining the pH to 8.5 with 1N NaOH. After another 20 min at 0°-5°C, the reaction mixture was quenched by addition of 20 mL of 0.2M pH 6.0 phosphate. The aqueous solution was then washed with EtOAc (20 mL) and then chromatographed on reversed phase silica gel (μ-Bondapak c-18, 3×15 cm) using 0.01M pH 7.0 phosphate buffer and acetonitrile (0-10%) as eluent. The UV active fractions were desalted on the same column using water and acetonitrile (10%) and lyophilized to give 0.153 g (53%) of the title compound as a white amorphous solid: [α]D24 -3.6° (c 0.55, H2 O);
Purity by HPLC: 97.5% on μ-Bondapak c-18, 3.9 mmB 30 cm, 15% CH3 CN--H2 O pH 7.4 phosphate buffer, flow rate 1 mL/min, UV detector 300 nm, retention time 5.8 min;
UV (H2 O, pH 7.4 phosphate buffer) λmax : 262 (5,476) and 304 nm (8,790);
IR (KBr) λmax : 1750 (C═O of β-lactam), 1715 and 1600 (C═O of carboxylate);
1 H NMR (200 MHz, D2 O) δ: 1.27 (d, J=6.35 Hz, 3H, CH3 CHO), 1.1-1.7 (m, 6H, CH2 -1,2 and 3 of butyl), 3.11 (m, 1H, H-4), 3.2-3.4 (m, 3H, H-6 and CH2 NH), 4.08 (m overlapping with SCH2, 1H, H-5), 4.08 (ABq, JAB =14.75 Hz, Δν23.2 Hz, SCH2), 4.21 (m, 1H, CH3 CHOH), 7.47 (m, 2H, H-3 of pyridine), 7.78 (s, 1H, C H=NH) and 8.47 ppm (m, 2H, H-2 of pyridine).
(4R,5S,6S)-4-[3"-(N-Formimidoyl)aminopropyl]-6-[(1'R)-1'-hydroxyethyl]-3-[( pyridin-4-yl)methylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR230##
A cold (ice bath) solution of (4 R,5 S,6 S)-4-(3"-aminopropyl)-6-[(1' R)-1'-hydroxyethyl]-3-[(pyridin-4-yl)methylthio]-7-oxo-1-azabicyclo[3.2.0] hept-2-ene-2-carboxylic acid as described in Example 44 (0.16 g, 0.42 mmol) in a 0.05M pH 7.0 aqueous phosphate buffer (30 mL) was treated with a 0.1N aqueous NaOH solution (to raise and maintain the pH around 8.0) and portionwise with benzyl formimidate hydrochloride (720 mg, 4.2 mmole). The mixture was stirred for 30 min, neutralized to pH 7.0 with 1M aqueous NaH2 PO4 and passed twice through a μ-Bondapak C18 column (H2 O→5% CH3 CN2 O) to give the title compound (76 mg, 47%) as a lyophilized powder;
Purity: 96.7% (HPLC 304 nm);
UV (H2 O) λmax : 262 (ε7120), 304 (ε10700);
IR (Nujol) νmax : 3600-3100 (OH, NH2), 1755 (C═O), 1710 (C═N) and 1600 cm-1 (C═O);
1 H NMR (D2 O, 200 MHz) δ: 8.48-8.44 (2H, m, aromatic --H), 7.78-7.44 (2H, m, aromatic H), 4.27-4.15 (1H, m, H-1'), 4.14, 4.07, 4.00, 3.93 (2H, ABq, J=Hz, CH2 -aromatic), 4.075 (1H, dd, J=2.6 Hz, J=9.3 Hz, H-5), 3.34-3.23 (3H, m, H-5 and CH2 --N), 3.303, 3.291 (part of H-6, d, J=2.5 Hz), 3.17-3.07 (1H, m, H-4), 1.70-1.36 (4H, m, CH2 CH2 -4), and 1.268 ppm (3H, d, J=6.3 Hz, CH3).
(4R,5S,6S)-3-[(2-Aminoethyl)thio]-4-(2"-hydroxyethyl)-6-[(1'R)-1'-hydroxyet hyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR231## A. Allyl (4R,5S,6S)-4-(2"-tert butyldimethylsilyloxyethyl)-6-[(1'R)-1'-tert butyldimethylsilyloxyethyl]-3 -[(2-p-nitro-benzyloxycarbonylaminoethyl)thio]-7-oxo-1-azabicyclo[3.2.0]-he pt-2-ene-2-carboxylate ##STR232##
A solution of allyl (4R,5R,6S)-4-(2"-tert-butyldimethylsilyloxyethyl)-6-[(1'R)-1'-tert-butyldi methylsilyloxyethyl]-3,7-dioxo-1-azabicyclo[3.2.0]heptane-2-carboxylate (5.41 mmol, prepared by cyclization of 3.0 g, 5.41 mmol of the diazo precursor as in Example 5) in dry acetonitrile (25 mL) was treated at 0°-5°C and under nitrogen with diphenyl chlorophosphate (1.18 mL, 5.65 mmol) and N,N-diisopropylethylamine (1.0 mL, 5.65 mmol) added simultaneously over 5 min. Then a small crystal of 4-N,N-dimethylaminopyridine was added and the solution was stirred for 90 min. More N,N-diisopropylethylamine (1.42 mL, 8.1 mmol) followed by p-nitrobenzyl 2-mercaptoethylcarbamate (2.10 g, 8.19 mmol) [I. Shinkai et al., Synthesis, 924 (1980)] were added and the mixture was stirred for 16 h. The reaction mixture was then diluted with EtOAc (400 mL) washed with water, brine and dried (MgSO4). After evaporation of the solvent under reduced pressure, the residue was chromatographed on silica gel (3.5×10 cm). Elution with a gradient of ethyl acetate (5-10%) in toluene gave 1.75 g (42%) of the title compound as an oil:
IR (NaCl, film) νmax : 1772 (C═O of β-lactam) and 1720 cm-1 (C═O of carboxylate);
1 H NMR (200 MHz, CDCl3) δ: 0.04, 0.05 and 0.08 (3×s, 3H, 3H and 6H, SiCH3), 0.88 (s, 18H, Si t-Bu), 1.27 (d, J=6.14 Hz, 3H, CH3 CHO), 1.5-2.1 (m, 2H, CH2 CH2 OTBDMS), 2.8-3.2 (m, 2H, SCH2), 3.10 (dd, JH6,H5 =2.49 Hz, JH6,H1 =6.34 Hz, 1H, H-6), 3.2-3.9 (m, 5H, H-4, CH2 OTBDMS and CH2 NH), 4.16 (dd, JH5,H6 =2.49 Hz, JH5,H4 =9.37 Hz, 1H, H-5), 4.23 (m, 1H, CH3 CHO), 4.74 (m, 2H, CH2 of allyl), 5.18 (s, 2H, CH2 of p-nitrobenzyl, 5.2-5.5 and 5.9-6.1 (2×m, 2H and 1H, CH of allyl), 7.5 (d, J=8.7 Hz, 2H, H ortho of p-nitrobenzyl) and 8.22 ppm (d, J=8.7 Hz, 2H, H meta of p-nitrobenzyl).
B. Allyl (4R,5S,6S)-4-(2"-hydroxyethyl)-6-[(1'R)-1'-hydroxy-ethyl]-3-[(2-p-nitroben zyloxycarbonylaminoethyl)thio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carbox ylate ##STR233##
A solution of allyl (4R,5S,6S)-4-(2"-tert-butyldimethylsilyloxyethyl)-6-[(1'R)-1'-tert-butyldi methylsilyloxyethyl]-3-[(2-p-nitrobenzyloxycarbonylaminoethyl)thio]-7-oxo-1 -azabicyclo[3.2.0]hept-2-ene-2-carboxylate (1.75 g, 2.29 mmol) in dry tetrahydrofuran (20 mL) was cooled to 0°-5°C and treated under nitrogen with acetic acid (1.6 mL, 27.5 mmol) followed by 13 mL (13.0 mmol) of a 1.0M solution of tetrabutylammonium fluoride in tetrahydrofuran. After 120 h at 5°C, the reaction mixture was diluted with ethyl acetate (200 mL), washed with water, saturated NaHCO3, 0.2M pH 7.0 phosphate buffer, brine and dried (MgSO4). The residue obtained after evaporation of the solvent was chromatographed on silica gel (3×11 cm) using ethyl acetate and then a mixture of ethyl acetate, acetone and acetonitrile (18:1:1) as eluent.
The first fractions gave 0.78 g (50%) of mono deprotected product, allyl(5S,6S)-6-[(1'R)-1'-tert-butyldimethylsilyloxyethyl]-4-(2"-hydroxyeth yl)-3-(2-p-nitrobenzyloxycarbonylaminoethyl)thio]-7-oxo-1-azabicyclo[3.2.0] hept-2-ene-2-carboxylate as an oil.
The following fractions gave 0.23 g (19%) of the title compound as a foam:
IR (NaCl, film) νmax : 1770 (C═O of β-lactam), 1725 and 1705 cm-1 (C═O of ester);
1 H NMR (200 MHz, CDCl3) δ: 1.37 (d, J=6.23 Hz, 3H, CH3 CHO), 1.7-2.1 (m, 2H, CH2 CH2 OH), 2.8-3.2 (m, 2H, SCH2), 3.26 (dd, JH6,H5 =2.55 Hz, JH6,H1 =7.77 Hz, 1H, H-6), 3.3-3.9 (m, 5H, H-4, CH2 OH and CH2 NH), 4.1-4.4 (m, 2H, H-5 and CH3 CHO overlapping), 4.75 (m, 2H, CH2 of allyl), 5.19 (s, 2H, CH2 of p-nitrobenzyl), 5.2-5.5 and 5.9-6.1 (2×m, 2H and 1H, CH of allyl), 7.5 (d, J=8.7 Hz, 2H, H ortho of p-nitrobenzyl) and 8.22 ppm (d, J=8.7 Hz, H meta of p-nitrobenzyl).
C. (4R,5S,6S)-3-[(2-Aminoethyl)thio]-4-(2"-hydroxyethyl)-6-[(1'R)-1'-hydroxye thyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR234##
A solution of allyl (4R,5S,6S)-4-(2"-hydroxyethyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(2-p-nitrobenz yloxycarbonylaminoethyl)thio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxy late (0.99 g, 1.85 mmol) in dry ethyl acetate (40 mL) was treated at 22°C and under nitrogen with tetrakis(triphenylphosphine)palladium [0] (0.050 g) and 4 mL (2.0 mmol) of a 0.5M solution of potassium 2-ethylhexanoate in ethyl acetate. After 30 min, a precipitate was formed and the reaction mixture was cooled to 0°-5°C for 2 h. The solid was then filtered and dried under vacuum to give 1.0 g of the intermediate potassium salt as a light brown solid. The solid was then added to a mixture of cold 0.2M pH 7.0 phosphate buffer (40 mL), tetrahydrofuran (20 mL) and diethyl ether (20 mL) and hydrogenated at 0°-5°C over 1.2 g of 10% palladium on activated carbon and under 45 psi of hydrogen for 1 h. The catalyst was filtered and the filtrate was chromatographed twice on reversed phase silica gel (μBondapak C18, 3×14 cm) using a gradient of acetonitrile (0-10%) in water as eluent. Lyophilization of the first fractions gave 0.150 g (26%) of the title compound as a white amorphous solid. The tail fractions also gave 0.450 g of partially reduced material. Crystallization of the first fractions in water (1 mL) gave 0.096 g of the title compound as small cubes:
Purity by HPLC: 99.8% on μBondapak C18, 3.9 mm×30 cm, elution 2% CH3 CN--H2 O pH 7.4 phosphate buffer, flow rate 1 mLin, uv detector 300 nm, retention time 6.24 min;
UV (water, pH 7.4, phosphate buffer) λmax : 298 nm (8,510);
IR (KBr) νmax : 1758 (C═O of β-lactam), 1638, 1618 and 1580 cm-1 (C═O of carboxylate);
1 H NMR (200 MHz, D2 O) δ: 1.32 (d, J=6.42 Hz, 3H, CH3 CHO), 1.4-2.2 (m, 2H, CH2 -1 of hydroxyethyl), 2.9-3.8 (m, 7H, H-4, S CH2 CH2 NH2 and CH2 OH), 3.49 (dd, JH6,H5 =2.72 Hz, JH6,H1 =5.37 Hz, 1H, H-6), and 4.2-4.4 ppm (m, 2H, H-5 and CH3 CHO overlapping).
(4R,5S,6S)-4-[(2"R or S)-Aminopropyl]-6-[(1'R)-1'-hydroxyethyl]-3-[(pyridin-2-yl)methylthio]-7-o xo-1-azabicyclo-[3.2.0]hept-2-ene-2-carboxylic acid; isomer A ##STR235## A. 4-Azido-(pyridin-2-yl)methylthiovalerate ##STR236##
A cold (5°C) solution of 4-azido valeric acid (59.0 g, 412.2 mmol) and N-methyl imidazole (33.84 g, 412.2 mmol) in CH2 Cl2 (1200 mL) was treated dropwise with SOCl2 (15 min). The reaction mixture was stirred at 5°C for 1 h and 20°C for 2.5 h. The reaction mixture was again cooled in an ice-bath and treated dropwise this time (15 min) with a solution of 2-mercaptomethyl pyridine (51.6 g, 412.2 mmol) and N-methyl imidazole (37.2 g, 453.4 mmol) in CH2 Cl2 (50 mL). After stirring for 15 min at 5°C, the solvent was evaporated and replaced by ethyl acetate (500 mL). The solution was washed with water (250 mL). The organic layers were combined and washed with NaHCO3. Finally after washing with brine, the organic solution was dried (MgSO4) and evaporated to give 97.23 g (94.2%) of the title compound.
IR (CH2 Cl2) νmax : 2110 cm-2 (--N3), 1690 cm-1 (thioester);
1 H NMR (CDCl3) δ: 8.55-8.52 (1H, m, pyridine --H), 7.67-7.58 (1H, m, pyridine-H), 7.35-7.31 (1H, m, pyridine-H), 7.20-7.13 (1H, m, pyridine-H), 4.36 (2H, s, CH2 --S), 3.55-3.45 (1H, m, CH--N3), 2.74-2.65 (2H, m, CH2 COS), 1.89-1.62 (2H, m, CH2 C--N3), 1.28 (3H, d, J: 6.53 Hz, CH3 --).
B. Enolsilyl ether of 4-azido-(pyridin-2-yl)methylvalerate
A cold (5°C) solution of 4-azido-(pyridin-2-yl)methylthiovalerate (97.2 g, 388.4 mmol) and triethylamine (86.5 g, 854.5 mmol) in CH2 Cl2 (1000 mL) was treated dropwise (25 min) with tert-butyldimethylsilyl trifluoromethanesulfonate (205.3 g, 776.8 mmol). The ice-bath was allowed to become exhausted and the solution stirred at 20°C for 15 h. Then the solvent was evaporated and replaced by petroleum ether (1000 mL). The solution was shaken with cold water (500 mL) and the two phases filtered through a pad of Celite. The aqueous layer was discarded and the organic phase washed successively with cold water, aqueous NaHCO3, cold water again and finally brine. The organic solution was dried (MgSO4) and treated with charcoal. After filtration through a pad of Celite, the dark filtrate was given two additional charcoal treatments to finally yield a red solution. After evaporation of the solvent there was obtained 99.4 g (70.2%) of the title compound as a red oil.
IR (CH2 Cl2) νmax : 2110 cm-1 (--N3);
1 H NMR (CDCl3, 200 MHz) δ: 8.57-8.53 (1H, m, pyridine-H), 7.67-7.58 (1H, m, pyridine-H), 7.30-7.25 (1H, m, pyridine-H), 7.18-7.11 (1H, m, pyridine-H), 5.00 (0.32H, t, J: 7.65 Hz, vinylic H), 4.85 (0.68H, t, J: 7.29 Hz, vinylic-H), 4.05 (0.64H, s, --SCH2), 3.98 (1.36H, s, --SCH2 --), 3.34 (0.68H, m, CH--N3), 3.22 (0.32H, m, CH--N3), 2.25-2.15 (2H, m, --CH2 --), 1.10 (2.04H, d, J: 6.54 Hz, H3 C--), 1.08 (0.96H, d, J: 6.53H, H3 C--), 0.99 (9H, 2s, t-butyl), 0.25 and 0.22 ppm (6H, 2s, dimethyl).
C. (3S,4S)-3-[(1'R)-1'-tert-Butyldimethylsilyloxyethyl]-4-[(1"R)-1"-(pyridin- 2-yl)methylthiocarbonyl-3"-azidobutyl]-azetidin-2-one ##STR237##
To a cold (5°C) suspension of fused ZnCl2 (33.4 g, 245 mmol) in CH2 Cl2 (500 mL) was added successively (3S,4R)-4-acetoxy-3-[(1'R)-1'-tert-butyldimethylsilyloxyethyl]azetidin-2-o ne (70.42 g, 245 mmol) and the tert-butyldimethylsilylenol ether of 4-azido-(pyridin-2-yl)methylthiovalerate from Step B (99.4 g, 272.6 mmol). The ice-bath was allowed to become exhausted while stirring the mixture mechanically overnight (18 h). Then the solvent was evaporated and the viscous residue partitioned between diethyl ether (500 m) and water (100 mL). The aqueous phase was discarded and the organic solution washed successively with water, NaHCO3, water again and finally brine. The organic phase was dried (MgSO4), treated with charcoal, filtered and evaporated. The red viscous oil (142.5 g) thus obtained was purified by chromatography (SiO2, CH2 Cl2, 5% CH3 CN in CH2 Cl2 and ethyl acetate) to give 38.0 g (32.5%) of the title compound as a 1:1 mixture of isomeric compounds at C-3".
IR (CH2 Cl2) νmax : 3405 (NH), 2115 (--N3), 1765 (β-lactam), 1680 cm-1 (CO--S);
Less polar isomer A:
1 H NMR (CDCl3) δ: 8.56-8.52 (1H, m, pyridine --H), 7.68-7.60 (1H, m, pyridine --H), 7.33-7.26 (1H, m, pyridine), 7.21-7.15 (1H, m, pyridine --H), 5.83 (1H, s, NH), 4.29 (2H, s SCH2 --), 4.15 (1H, m, CH'), 3.80 (1H, dd, J: 6.20, 2.14 Hz, H-4), 3.48 (1H, m, CH--N3), 3.16-3.05 (2H, m, H-3, H-1"), 1.96 and 1.44 (2H, 2m, --CH2"), 1.29 (3H, d, J: 6.41, H3 C--C--N3), 1.03 (3H, d, J: 6.29, --CH3), 0.854 (9H, s, t-butyl), 0.05 (6H, s, Si(CH3)2).
More polar isomer B:
1 H NMR (CDCl3) δ: 8.54-8.52 (1H, m, pyridine --H), 7.68-7.59 (1H, m, pyridine --H), 7.36-7.26 (1H, m, pyridine --H), 7.21-7.15 (1H, m, pyridine --H), 5.85 (1H, s, NH), 4.28 (2H, d, J: 5.25 Hz, S--CH2), 4.17 (1H, m, CH'), 3.89 (1H, dd, J: 2.05, 6.87 Hz, H-4), 3.49 (1H, m, CH--N3), 3.05 (1H, m, H-3), 2.85 (1H, m, H-1"), 2.05 and 1.57 (2H, 2m, CH2"), 1.28 (3H, d, J: 6.47, H3 CC--N3), 1.01 (3H, d, J: 6.32, H3 C), 0.85 (9H, s, t-butyl ), 0.05 (6H, s, Si (CH3)2.
D. (3S, 4S )-3-[(1'R)-1'-tert-Butyldimethylsilyloxyethyl]-4-[(1"R)-1"-carboxy-3"-azid obutyl]azetidin-2-one ##STR238##
Hydrogen peroxide (30%, 27 mL, 314 mmol) was added to a cold (5°C) solution of (3S,4S)-3-[(1'R)-1'-tert-butyldimethylsilyloxyethyl]-4-[(1"R)-1"-(pyridin- 2-yl)methylthiocarbonyl-3"-azidobutyl]azetidin-2-one (37.5 g, 78.5 mmol) followed by the dropwise addition of 1N NaOH (235.5 mL, 235.5 mmol). The addition was done in 40 min keeping T<10°C The mixture was stirred for an additional 30 min and then acidified to pH ∼1.0 with conc. HCl (30 mL). The solution was extracted with ethyl acetate. The extracts were washed twice with brine, dried (MgSO4) and evaporated. The solid thus obtained was triturated in petroleum ether and collected by filtration to give 24.0 g (82.6%) of the title compound; mp 123°-125°C (dec).
IR (CH2 Cl2) νmax : 2110 (--N3), 1765 (β-lactam), 1740 and 1710 cm-1 (--CO2 H).
Less polar isomer A:
1 H NMR (CDCl3) δ: 6.35 (1H, s, NH), 4.20 (1H, m, CH'), 3.89 (1H, dd, J: 2.05, 5.50 Hz, H-4), 3.58 (1H, m, CH--N3), 3.13 (1H, m, H-3), 2.95 (1H, m, H-1"), 1.88 and 1.48 (2H, 2m, --CH2), 1.34 (3H, d, J: 6.45 Hz, CH3 --C--N3), 1.19 (3H, d, J: 6.26 --CH3), 0.87 (9H, s, t-butyl), 0.07 (6H, 2s, Si(CH3)2).
More polar isomer B:
1 H NMR (CDCl3) δ: 6.42 (1H, s, NH), 4.20 (1H, m, CH'), 3.88 (1H, dd, J: 1.94, 6.42 Hz, H-4), 3.55 (1H, m, CH--N3), 3.15 (1H, m, H-3), 2.74 (1H, m, H-1"), 1.98 and 1.59 (2H, 2m, --CH2), 1.33 (3H, d, J: 6.50 Hz, H3 CC--N3), 1.18 (3H, d, J: 6.28, --CH3), 0.87 (9H, s, t-butyl), 0.068 (6H, 2s, Si(CH3)2).
E. (3S,4R)-3-[(1'R)-1'-tert-Butyldimethylsilyloxyethyl]4-[(1"R)-1"-(2-azidopr opyl)-3"-allyloxycarbonyl-2"-oxo-propyl]azetidin-2-one ##STR239##
A mixture of (3S,4S)-3-[(1'R)-1'-tert-butyldimethylsilyloxyethyl]-4-[(1"R)-1"-carboxy-3 "-azidobutyl]azetidin2-one (3.48 g, 9.39 mmol) and carbonyldiimidazole (1.70 g, 10.33 mmol) in CH3 CN was stirred at 20°C for 30 min and then evaporated to dryness to leave a foamy material.
In a separate flask, a suspension of magnesium monoallyl malonate (4.37 g, 14 mmol) in benzene (75 mL) was refluxed collecting the residual water in a Dean Stark trap. After 1.5 h at reflux, this solution was cooled to 20°C and added to the above imidazolide. This mixture was placed in an oil bath preheated at 70°C and heated for 18 h. Then the mixture was diluted with an equal volume of ethyl acetate and washed with water, dilute HCl, water again, dilute NaHCO3 and finally water and brine. The organic phase was dried (MgSO4) and evaporated. The crude product was purified by chromatography (SiO2, CH2 Cl2 then 5-10% CH3 CN in CH2 Cl2) to give 3.37 g (79.3%) of the title compound as an oil which solidified;
IR (CH2 Cl2) νmax : 2115 (--N3) 1765 1715 cm-1 (C═O)
Less polar isomer A:
1 H NMR (CDCl3) δ: 4.6-6.0 (5H, allyl pattern) 4.18 (1H, m, H-1'), 3.80-3.85 (1H, m, H-4), 3.62 (1H, d, --CHC═O), 3.46 (1H, m, CH--N3), 3.27 (0.6H, m, H-1"), 2.99 and 2.93 (1H, m, H-3), 2.55 (0.4H, m, H-1"), 1.93 and 1.41 (2H, 2m, --CH2 C--N3) 1.32 and 1.31 (3H, 2d, J: 6.45, 6.40 Hz, CH3 CN3), 1.19 and 1.12 (3H, 2d, J: 6.27, 6.29 Hz, --CH3), 0.87 (9H, s, t-butyl), 0.07 and 0.06 (6H, 2s, Si(CH3)2).
More polar isomer B:
1 H NMR (CDCl3) δ: 4.6-6.0 (5H, allyl pattern) 4.17 (1H, m, H-1'), 3.84 (1H, dd, J: 2.1, 5.35 Hz, H-4), 3.63 (1H, d, CH2 CO) 3.48 (1H, m, CHN3), 3.07 (0.6H, m, H-1"), 2.93 (1H, m, H-3), 2.0 and 1.6 (2H, 2m, CH2 CN3), 1.27 and 1.32 (3H, 2d, J: 6.5 Hz, CH3 CN3) 1.09 and 1.18 (3H, 2d, J: 6.25 Hz, CH3), 0.87 (9H, s, t-butyl), 0.06 (6H, 2s, Si(CH3)2).
F. (3S,4R)-3-[(1'R)-1'-tert-Butyldimethylsilyloxyethyl]-4-[(1"R)-1"-(2-azidop ropyl)-3"-diazo-3"-allyloxycarbonyl-2"-oxopropyl]azetidin-2-one ##STR240##
A mixture of p-toluenesulfonyl chloride (442 mg, 2.32 mmol), sodium azide (154 mg, 2.37 mmol) and tetrabutylammonium chloride (12 mg) in CH3 CN (15 mL) was stirred at 20°C for 4 h. Then this mixture was cooled to 5°C and (3S,4R)-3-[(1'R)-1'-tert-butyldimethylsilyloxyethyl]-4-[(1"R)-1"-(2-azidop ropyl)-3"-allyloxycarbonyl-2"-oxopropyl]azetidin-2-one (953 mg, 2.11 mmol) in a minimum amount of CH3 CN was added followed, dropwise, by triethylamine (235 mg, 2.32 mmol). The faction mixture was stirred at 5°C for 1.5 h and then evaporated. The residue was taken up in diethyl ether and washed with water and brine. The organic phase was dried (MgSO4) and evaporated to leave a soft solid. This material was triturated in petroleum ether and the insoluble tosylamide (74.3%) filtered off. The filtrate was evaporated to give a yellow viscous oil which was purified by chromatography (SiO2, CH2 Cl2 then 5% CH3 CN in CH2 Cl2) to give 825 mg (81.7%) of the title compound as a viscous oil;
IR (CH2 Cl2) λmax : 2125 (═N2), 2118 (--N3), 1765 (β-lactam), 1713 cm-1 (--CO2 --);
Less polar isomer A:
1 H NMR (CDCl3) δ: 4.7-6.0 (5H, allyl pattern) 4.31 (1H, m, H-1"), 4.16 (1H, m, H-1'), 3.81 (1H, dd, J: 2.08, 4.90 Hz, H-4), 3.38 (1H, m, CH--N3), 3.05 (1H, m, H-3), 2.69 and 1.39 (2H, 2m, CH2 --CN3), 1.28 (3H, d, J: 6.42 Hz, H3 CCN3), 1.18 (3H, d, J: 6.29 Hz, --CH3), 0.86 (9H, s, t-butyl), 0.064 and 0.052 (6H, 2s, Si(CH3)2).
More polar isomer B:
1 H NMR (CDCl3) δ: 4.7-6.0 (5H, allyl pattern) 4.15 (2H, m, H-1', H-1"), 3.84 (1H, m, H-4), 3.45 (1H, m, CH--N3), 3.05 (1H, m, H-3), 2.10 and 1.5 (2H, 2m, CH2 C--N3), 1.27 (3H, d, J: 6.43 Hz, CH3 --CN3), 1.17 (3H, d, J: 6.27 Hz, --CH3), 0.87 (9H, s, t-butyl), 0.064 and 0.053 (6H, 2S, Si(CH3)2).
G. (3S,4R)-3-[(1'R)-1'-Hydroxyethyl]-4-[(1"R)-1"-(2-azidopropyl)-3"-diazo-3"- allyloxycarbonyl-2"-oxopropyl]azetidin-2-one ##STR241##
A cold (5°C) solution of (3S,4R)-3-[(1'R)-1'-tert-butyldimethylsilyloxyethyl]-4-[(1"R)-1"-(2-azidop ropyl)-3"-diazo-3"-allyloxycarbonyl-2"-oxopropyl]azetidin-2-one (825 mg, 1.72 mmol) in CH3 CN (10 mL) was treated with 4N HCl (0.52 mL, 2.06 mmol). The reaction mixture was stirred at 5°C for 3.5 h and 20°C for 1 h. The reaction was then quenched by adding saturated NaHCO3 (3 mL). After being diluted with ethyl acetate, the mixture was washed with water and brine (twice). The organic phase was dried (MgSO4) and evaporated. The crude product was purified by chromatography on silica gel eluting with CH2 Cl2 and then ethyl acetate to give 554 mg (88.4%) of the title compound as a yellow oil. The two isomeric compounds were not separated;
IR (CH2 Cl2) νmax : 3600 (--OH), 3400 (NH), 2145 (═N2), 2115 (--N3), 1763 (β-lactam), 1713 (C═O).
1 H NMR (CDCl3) δ: 4.7-6.0 (5H, allyl pattern), 4.12 (2H, m, H-1' and H-1"), 3.81 (1H, m, H-4), 3.45 (1H, m CH--N3), 3.05 (1H, m, H-3), 2.05 and 1.55 (2H, 2m, CH2 CN3), 1.30 (6H, several peaks, 2--CH3).
H. Allyl (4R,5S,6S)-4-(2"-azidopropyl)-6-[(1'R)-1'-hydroxyethyl]-3[(pyridin-2-yl)me thylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate ##STR242##
A suspension of rhodium octanoate dimer (55 mg) in C6 H6 (110 mL) was placed in an oil bath preheated at 130°C and refluxed for 30 min. Then (3S,4R)-3-[(1'R)-1'-hydroxyethyl]-4-[(1"R)-1"-(2-azidopropyl)-3"-diazo-3"- allyloxycarbonyl-2"-oxopropyl]azetidin-2-one (2.0 g, 5.49 mmol) was added cyclization was completed after 25 min under vigorous reflux. The solvent was evaporated and replaced by CH3 CN (55 mL). This solution was treated with diphenyl chlorophosphate (1.6 g, 6 mmol), N,N-diisopropylethylamine (0.78 g, 6 mmol) and a catalytic amount of 4-N,N-dimethylaminopyridine. After 15 min at 5°C the reaction was complete. So the reaction mixture was diluted with ethyl acetate and washed with water and brine. After drying (MgSO4), the organic phase was evaporated and the crude product purified by chromatography (SiO2 /Et2 O) to give 1.63 g (52.0%) of enol phosphate.
The purified enol was dissolved in cold (5°C) DMF (16 mL) and treated with 2-picolylthiol (465 mg, 3.72 mmol) and N,N-diisopropylethylamine (481 mg, 3.72 mmol). The reaction mixture was stirred at 5°C for 17 h and 20°C for 24 h. The solution was then diluted with ethyl acetate (100 mL) and washed with cold brine (3×50 mL), 10% NaHSO3 (2×25 mL), water and finally brine. The organic phase was dried (MgSO4) and evaporated to leave a brown viscous oil. Chromatography resulted in the purification and separation of the two isomers of the title compound (SiO2 /cold Et2 O) 470 mg (37%) of the less polar isomer A and 325 mg (25.6%) of the more polar isomer B:
Less polar isomer A
IR (CH2 Cl2) νmax : 3600 (--OH), 2115 (--N3), 1775 (β-lactam), 1710 cm-1 (--CO2 --);
1 H NMR (CDCl3) δ: 8.55 (1H, m, Ar--H), 7.66 (1H, m, Ar--H), 7.34 (1H, m, Ar--H), 7.19 (1H, m, Ar--H), 4.6-6.0 (5H, allyl pattern), 4.19 (2H, ABq, J: 13.8 Hz, S--CH2), 4.16-4.24 (2H, m, H-1', H-5), 3.87 (1H, m, CH--N3), 3.65 (1H, m, H-4), 3.05 (1H, dd, J: 2.70, 7.92 Hz, H-6), 1.6-2.0 (2H, 2m, CH2 CN3), 1.39 (6H, d, J: 6.15 Hz, 2-CH3).
More polar isomer B
IR(CH2 Cl2) νmax : 3600 (--OH) 2115 (--N3), 1772 (β-lactam). 1710 cm-1 (--CO2 --);
1 H NMR (CDCl3) δ: 8.51 (1H, m, Ar--H), 7.64 (1H, m, Ar--H), 7.37 (1H, m, Ar--H), 7.21 (1H, m, Ar--H), 4.6-6.10 (5H, allyl pattern), 4.22 (1H, m, H-1'), 4.14 (1H, dd, J: 2.66, 9.60 Hz, H-5), 4.11 (2H, ABq, J: 14.18 Hz, --SCH2), 3.75 (1H, m, CH--N3), 3.62 (1H, m, H-4), 3.32 (1H, dd, J: 2.70, 7.32, H-6), 1.6-2.0 (2H, 2m, --CH2 C--N3), 1.39 (3H, d, J: 6.42 Hz, --CH3), 1.38 (3H, d, J: 6.25 Hz, --CH3).
I. Sodium (4R,5S,6S)-4-[(2"R or S)-azidopropyl]-6-[(1'R)-1'-hydroxy-ethyl]-3[(pyridin-2-yl)methylthio]-7-o xo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate; isomer A ##STR243##
A cold (5°C) solution of allyl (4R,5S,6S)-4-(2"-azidopropyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(pyridin-2-yl)m ethylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate (500 mg, 1.13 mmol, the less polar isomer A of Step H) in CH2 Cl2 (50 mL) was treated with 0.5M sodium ethyl hexanoate (2.5 mL, 1.24 mmol) and (PPh3)4 Pd (131 mg, 0.113 mmol). After stirring for 30 min, the solution was diluted with diethyl ether (100 mL) and extracted with 0.04M buffer (pH 7.0, 3×15 mL). The aqueous extracts were washed with diethyl ether and chromatographed on reversed phase SiO2 (partisil); elution with water and then 5-15% CH3 CN in water. The pertinent fractions were combined and lyophilized to give 180 mg (38.9%) of the title compound;
1 H NMR (D2 O) δ: 8.50 (1H, m, Ar--H), 7.89 (1H, m, Ar--H), 7.4-7.6 (2H, 2m, 2 Ar--H), 4.26-4.06 (2H, m, H-1', H-5), 4.18 (2H, ABq, J: 14.09, S--CH2), 3.6 (1H, m, CH--N3), 3.35 (2H, m, H-6, H-4), 1.8 and 1.56 (2H, 2m, CH2 C--N3), 1.35 (3H, d, J: 6.71 Hz, --CH3), 1.32 (3H, d, J: 6.65 Hz, --CH3).
J. (4R,5S,6S)-4-[(2"R or S)-Aminopropyl]-6-[(1'R)-1'-hydroxyethyl]-3-[(pyridin-2-yl)methylthio]-7-o xo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid; isomer A ##STR244##
A solution of sodium (4R,5S,6S)-4-(2"-azidopropyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(pyridin-2-yl)m ethylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate (175 mg, 0.425 mmol, the less polar isomer A of Step I) in 0.05M phosphate buffer (pH 6.0, 60 mL) was hydrogenated at 5°C in the presence of 30% Pdelite (350 mg) at a pressure of 45 psi of hydrogen. After 75 min, additional catalyst (100 mg) was added and the reduction continued for 30 more minutes. The catalyst was filtered off and the filtrate chromatographed on reversed phase SiO2 (partisil) eluting with water and then 5% CH3 CN in water. The pertinent fractions were lyophilized to give 50 mg (31.2%) of the title compound; isomer A;
UV (H2 O) λmax : 266 (4093), 300 (3945);
IR (Nujol) νmax : 1755 (β-lactam), 1595 cm-1 (--CO2 --);
1 H NMR (D2 O) δ: 8.46 (1H, m, Ar--H), 7.84 (1H, m, Ar--H), 7.46-7.29 (2H, m, 2 Ar--H), 4.24-4.01 (4H, m, H-1', H-5, --SCH2), 3.17-3.46 (3H, m, H-4, H-6, CH--N--), 1.4-2.0 (2H, 2m, CH2 C--N), 1.31 (3H, d, J: 6.53 Hz, --CH3), 1.29 (3H, d, J: 6.31 Hz, --CH3).
(4R,5S,6S)-4-[(2"S or R)-Aminopropyl]6-[(1'R)-1'-hydroxyethyl]-3-[(pyridin-2-yl)methylthio]-7-ox o-1-azabicyclo-[3.2.0]-hept-2-ene-2-carboxylic acid; isomer B ##STR245## A. Sodium (4R,5S,6S)-4-[(2"S or R)-azidopropyl]-6-[(1'R)-1'-hydroxyethyl]-3-[(pyridin-2-yl)methylthio]-7-o xo-1-azabicyclo-[3.2.0]hept-2-ene-2-carboxylate; isomer B ##STR246##
A cold (5°C) solution of allyl (4R,5S,6S)-4-(2"-azidopropyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(pyridin-2-yl)m ethylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate (340 mg, 0.767 mmol, the more polar isomer B from Example 57, Step H) in CH2 Cl2 (35 mL) was treated with 0.5M sodium ethyl hexanoate (1.7 mL, 0.85 mmol) and (PPh3)4 Pd (88 mg, 0.08 mmol). After stirring for 30 min, the solution was diluted with diethyl ether (70 mL) and extracted with 0.04M buffer (pH 7.0, 3×10 mL). The aqueous extracts were washed with diethyl ether and chromatographed on reversed phase SiO2 (partisil): elution with water and then 5-15% CH3 CN in water. The pertinent fractions were combined and lyophilized to give 140 mg (44.4%) of the title compound;
1 H NMR (D2 O) δ: 8.48 (1H, m, Ar--H), 7.88 (1H, m, Ar--H), 7.49 (1H, m, Ar--H), 7.40 (1H, m, Ar--H), 4.02-4.27 (4H, m, H-1', H-5, SCH2), 3.67 (1H, m, CH--N3), 3.43 (1H, dd, J: 2.5, 5.84, H-6), 3.15 (1H, m, H-4), 1.50-1.90 (2H, 2m, CH2 C--N3), 1.28 (6H, d, J: 6.35 Hz, 2-CH3).
B. (4R,5S,6S)-4-[(2"S or R)-Aminopropyl]6-[(1'R)-1'-hydroxyethyl]-3-[(pyridin-2-yl)methylthio]-7-ox o-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid; isomer B ##STR247##
A solution of sodium (4R,5S,6S)-4-(2"-azidopropyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(pyridin-2-yl)m ethylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate (135 mg, 0.328 mmol, the more polar isomer B of Step A) in 0.05M phosphate buffer (pH 6.0, 45 mL) was hydrogenated at 5°C in the presence of 30% Pd/Celite (270 mg) at a pressure of 40 psi of hydrogen. After 65 min, the catalyst was filtered off and the filtrate chromatographed on reversed phase SiO2 (partisil) eluting with water and then 5% CH3 CN in water. The pertinent fractions were combined and lyophilized to give 60 mg (48.5%) of the title compound;
UV (H2 O) λmax : 268 (8362), 302 (9583);
IR (Nujol) νmax : 1760 (β-lactam), 1595 cm-1 (--CO2 --);
1 H NMR (D2 O) δ: 8.46 (1H, m, Ar--H), 7.83 (1H, m, Ar--H), 7.47 (1H, m, Ar--H), 7.36 (1H, m, Ar--H), 4.01-4.25 (4H, m, H-1', H-5, SCh2) 3.40 (2H, m, --CH--N dd, J: 2.95, 6.66 H-6), 3.14 (1H, m, H-4), 1.98 and 1.75 (2H, 2m, CH2 --CN), 1.35 (3H, d, J: 6.44 Hz, --CH3), 1.29 (3H, d, J: 6.37, --CH3).
(4R,5S,6S)-3-[(cyanopropyl)thio]-4-(3"-guanidinopropyl)-6-[(1'R)-1'-hydroxy ethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR248##
A cold solution (ice bath) of (4 R,5 S,6 S)-4-(3"-aminopropyl)-3-[(3-cyanopropyl)thio]-6-[(1' R)-1'-hydroxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid (150 mg, 0.420 mmol) as described in Example 50 in a 0.04M pH 7.0 aqueous phosphate buffer solution (25 mL) was treated first with a 0.1M aqueous NaOH solution (to raise and maintain the pH between 7.6 and 7.8) and with aminoiminomethanesulfonic acid (520 mg, 4.20 mmol). The mixture was stirred for 2 h and the pH was adjusted to 7.1 with a 0.1N aqueous HCl solution. The mixture was passed through a μ-Bondapak C18 reversed phase column (45 g, H2 O→1%→8% CH3 CN2 O) to give the title compound (125 mg, 75%) as a lyophilized powder;
Purity 98.4% (HPLC 300 nm);
UV (H2 O) λmax : 302 (ε8230);
IR (Nujol) νmax : 2250 (C═N), 1750 (C═O), 1700 (C═N) and cm-1 (C═O);
1 H NMR (D2 O, 200 MHz) δ: 4.33-4.21 (1H, m, H-1'), 4.243 (1H, dd, J=2.5 Hz, J=9.4 Hz, H-4), 3.41-3.23 (3H, m, H-4 and CH2 --N), 3.330 (1H, dd, J=2.5 Hz, J=6.3 Hz, H-6), 3.06-292, 2.85-2.73 (2H, 2 sets of m, SCH2), 2.71-2.60 (2H, m, CH2 CN), 2.05-1.49 (6H, m, CH2 CH2 CH2 CN and CH2 CH2) and 1.321 ppm (3H, d, 6.4 Hz, CH3).
(4R,5S,6S)-4-(3"-Guanidinopropyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(pyridin-4-y l)methylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR249##
A cold (ice bath) solution of (4 R,5 S,6 S)-4-(3"-aminopropyl)-6-[(1' R)-1'-hydroxyethyl]-3-[(pyridin-4-yl)methylthio]-7-oxo-1-azabicyclo[3.2.0] hept-2-ene-2-carboxylic acid (0.16 g, 0.42 mmol) [Example 44] in a 0.05M pH 7.0 aqueous phosphate buffer (30 mL) was treated with a 0.1N aqueous NaOH solution (to raise and maintain the pH around 7.7-8.1) and aminoiminomethanesulfonic acid (525 mg, 4.2 mmol). The mixture was stirred for 90 min, neutralized to pH 7.0 with a 1.0M aqueous NaH2 PO4 solution and passed through a μBondapak C18 reversed phase column (30 g, H2 O→8% CH3 CN2 O) to give the title compound (85 mg, 57%) as a lyophilized powder;
Purity: 95.2% (HPLC, 304 nm);
UV (H2 O) λmax : 304 (ε8,000), 262 (ε5200);
IR (Nujol) νmax : 3500-3100 (OH, NH), 1755 (C═O), 1660 (C═N ) and 1600 cm-1 (C═O);
1 H NMR (D2 O, 200 MHz) δ: 8.49-8.46 (2H, m, aromatic H), 7.49-7.46 (2H, m, aromatic --H), 4.25-4.16 (1H, m, H-1'), 4.16, 4.09, 4.01, 3.94 (2H, ABq, J=14.4 Hz, CH2 -aromatic), 4.058 (Part of H-5, d, J=2.4 Hz), 3.261 (1H, dd, J=2.5 Hz, J=6.02 Hz, H-6), 3.20-3.07 (3H, m, CH2 N, H-4), 1.8-1.5, 1.5-1.26 (4H, 2 sets of m, CH2 CH2 -4), and 1.280 ppm (3H, d, J=6.4 Hz, CH3).
(4R,5S,6S)-3-[(2-Cyanoethyl)thio]-4-(3"-guanidinopropyl)-6-[(1'R)-1'-hydrox yethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR250##
To a cold (ice bath) solution of (4 R,5 S,6 S)-4-(3"-aminopropyl)-3-[(2-cyanoethyl)thio]-6-[(1' R)-1'-hydroxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid (125 mg, 0.37 mmol) [prepared in Example 41] in a 0.04M pH 7.0 aqueous phosphate buffer (25 mL) was added a 0.1N aqueous NaOH and portionwise aminoiminomethanesulfonic acid (458 mg, 3.70 mmol) while maintaining the pH at 7.6-7.8. The mixture was stirred for 2.5 h at 5°C and the pH was adjusted to 7.05 with a 0.1N aqueous HCl solution. The solution was passed through a μ-Bondapak C18 column (38 g, H2 O, 1,2,3,4,5% CH3 CN2 O) to give the title compound (98 mg, 70%) as a lyophilized powder;
Purity 98.8% (HPLC, 300 nm);
UV (H2 O) λmax : 300 (ε8990);
IR (Nujol) νmax : 1755 (C═O), 1665 (C═N) and 1585 cm-1 (C═O);
1 H NMR (D2 O, 200 MHz) δ: 4.34-4.21 (1H, m, H-1'), 4.259 (1H, dd, J=2.6 Hz, J=9.2 Hz, H-5), 3.45-3.33 (1H, m, H-4), 3.351 (1H, dd, J=2.6 Hz, J=6.5 Hz, H-6), 3.29-3.22 (2H, m, CH2 --N), 3.18-3.08, 3.02-2.92 (2H, 2 sets of m, SCH2), 2.91-2.80 (2H, m, CH2 CN), 1.92-1.44 (4H, m, CH2 CH2 ) and 1.321 ppm (3H, d, J=6.3 Hz, CH3).
(4R,5S,6S)-4-(4"-Aminobutyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(1-methyl-1,2,3-t riazol-4-yl)methylthio]-7-oxo-1-azabicyclo[3.2.0]-hept-2-ene-2-carboxylic acid ##STR251## A. Allyl (4R,5S,6S)-4-(4"-azidobutyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(1-methyl-1,2,3- triazol-4-yl)methylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate ##STR252##
A solution of allyl (4R,5R,6S)-4-(4"-azidobutyl)-6-[(1'R)-1'-hydroxyethyl]-3,7-dioxo-1-azabicy clo[3.2.0]heptane-2-carboxylate (5.28 mmole, prepared by cyclization of 2.0 g, 5.28 mmol of the diazo precursor) in dry acetonitrile (40 mL) was treated at 0°-5°C and under nitrogen with diphenyl chlorophosphate (1.2 mL, 5.8 mmol) and N,N-diisopropylethylamine (1.0 mL, 5.8 mmol) added simultaneously over 5 min. A small crystal of 4-N,N-dimethylaminopyridine was then added and the clear mixture was stirred at the same temperature for 1 h. Then more N,N-diisopropylethylamine (1.8 mL, 10.6 mmol) followed by 1-methyl-4-mercaptomethyl-1,2,3-triazole (1.36 g, 10.5 mmol) were added and the mixture was stirred for 3 h. The reaction mixture was then quenched by addition of EtOAc (200 mL) and cold water. The organic phase was washed with 1M NaHSO3, saturated NaHCO3, brine and dried (MgSO4). Evaporation of the solvent gave an oil which was chromatographed on silica gel (5×10 cm) using a gradient of EtOAc in toluene (1:1 to EtOAc). Evaporation of the UV active fractions gave 1.51 g (62%) of the title compound as a foam:
IR (NaCl, film) νmax : 3400 (broad, OH) 2100 (N3), 1770 (C═O of β-lactam) and 1710 cm-1 (C═O of ester);
1 H NMR (200 MHz, CDCl3) δ: 1.37 (d, J=6.26 Hz, 3H, CH3 CHO), 1.3-1.9 (m, 6H, CH2 -1,2, and 3 of butyl), 1.92 (d, J=1.9 Hz, 1H, OH), 3.17 (dd, JH6,H5 =2.66 Hz, JH6,H1 =7.09 Hz, 1H, H-6), 3.33 (broad t, J=6.2 Hz, 2H, CH2 N3), 3.52 (broad t, J=9.0 Hz, 1H, H-4), 4.07 (ABq, JAB =14.75 Hz, Δν=54.4 Hz, 2H, SCH2), 4.08 (s, 3H, CH3 -1 of triazole), 4.2 (m, 2H, H-5 and CH3 CHO overlapping), 4.74 (m, 2H, CH2 of allyl), 5.2-5.5 and 5.9-6.1 (2×m, 2H and 1H, CH of allyl) and 7.48 ppm (s, 1H, H-5 of triazole).
B. (4R,5S,6S)-4-(4"-Aminobutyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(1-methyl-1,2,3- triazol-4-yl)methylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2,carboxylic acid ##STR253##
A solution of allyl (4R,5S,6S)-4-(4"-azidobutyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(1-methyl-1,2,3- triazol-4-yl)methylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate (1.51 g, 3.27 mmol) in dry EtOAc (75 mL) was treated at 22°C and under nitrogen with tetrakis(triphenylphosphine)palladium [0] (0.075 g) and 7.2 mL (3.6 mmol) of a 0.5M solution of potassium 2-ethylhexanoate in EtOAc. After 45 min, the reaction mixture was extracted with water (2×75 mL). The combined aqueous phase was maintained under vacuum to remove traces of organic solvent and then hydrogenated at 0°-5°C over 1.7 g of 5% Pd over alumina at 45 psi of hydrogen for 1 h (final pH 10.5). Then 25 mL of 0.2M pH 6.0 phosphate buffer was added and the catalyst was filtered on a Celite pad. The filtrate was concentrated by half under vacuum and then chromatographed on reversed phase silica gel μ-Bondapak C-18, 3.5×12 cm). Elution with a gradient of acetonitrile (0-5%) in water gave 1.0 g (76%) of the title compound as a white amorphous powder after freeze drying:
Purity by HPLC: 97% on μ-Bondapak C-18, 3.9 mm×30 cm, elution 5% CH3 CN--H2 Ol pH 7.4 phosphate buffer, flow rate 1 mLin, UV detector 300 nm, retention time 6.07 min;
UV (H2 O, pH 7.4 phosphate buffer) λmax : 302 nm (9,098);
IR (KBr) νmax : 1755 (C═O of β-lactam) and 1690 cm-1 (C═O of carboxylate);
1 H NMR (200 MHz, D2 O) δ: 1.30 (d, J=6.35 Hz, 3H, CH3 CHO), 1.2-1.9 (m, 6H, CH2 -1,2 and 3 of butyl), 3.0 (t, J=7.6 Hz, 2H, CH2 NH2), 3.23 (broad t, 1H, H-4), 3.33 (dd, JH6,H5 =2.52 Hz, JH6,H1 =6.33 Hz, 1H, H-6), 4.08 (s, 3H, CH3 -1 of triazole), 4.09 (ABq, JAB =14.93 Hz, Δν=33.7 Hz, 2H, SCH2), 4.1 (overlapping with SCH2, 1H, H-5), 4.24 (m, 1H, CH3 CHO) and 7.87 ppm (s, 1H, H-5 of triazole).
(4R,5S,6S)-3-[(2-Cyanoethyl)thio]-6-[(1'R)-1'-hydroxyethyl]-4-[2"(1-pyrroli dinyl)ethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR254## A. Allyl (4R,5S,6S)-6-[(1'R)-1'-tert-butyldimethylsilyloxyethyl]-3-[(2-cyanoethyl)t hio]-4-[2"-(1-pyrrolidinyl)ethyl]-7-oxo-1-azabicyclo-[3.2.0]hept-2-ene-2-ca rboxylate ##STR255##
A cold solution (dry ice-acetone bath) of allyl (4 R,5 S,6 S)-6-[(1'R)-1'-tert-butyldimethylsilyloxyethyl]-3-[(2-cyanoethyl)-thio]-4- (2"-hydroxyethyl)-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate (418 mg, 0.870 mmol) in CH2 Cl2 (10 mL) was treated with N,N-diisopropylethylamine (410 μL, 3.59 mmol) and dropwise with trifluoromethanesulfonic anhydride (209 μL, 1.24 mmol). The mixture was stirred for 30 min and pyrrolidine (530 μL, 6.35 mmol) was added dropwise. The dry ice-acetone bath was replaced by an ice-MeOH bath and the mixture was stirred for 2 h. The reaction mixture was applied on four preparative TLC (2 mm, EtOAc, R=0.2) to give the title compound (355 mg, 75.5%) as an oil;
IR (neat) νmax : 1780 and 1710 cm-1 (C═O);
1 H NMR (CDCl3, 200 MHz) δ: 6.05-5.85 (1H, m, vinylic-H), 5.49-5.72 (2H, m, vinylicH), 4.85-4.63 (2H, m, allylic-CH2), 4.3-4.13 (1H, m, H-1'), 4.193 (1H, dd, J=2.7 Hz, J=9.4 Hz, H-5), 3.224 (1H, dd, J=2.7 Hz, J=9.5 Hz, H-6), 3.37-3.19 (2H, m, H-4 and HC HS), 3.07-2.93 (1H, m, HCHS), 2.72-2.5 (8H, m, CH2 CN and (CH2)3 N), 2.1-1.8 (6H, m, CH2 -4 and CH2 --CH2), 1.587 (3H, d, J=6.1 Hz, CH3), 0.892 (9H, s, tert-butyl) and 0.088 ppm (6H, s, dimethyl).
B. Allyl (4R,5S,6S)-3-[(cyanoethyl)thio]-6-[(1'R)-1'-hydroxyethyl]-4-[2"-(1-pyrroli dinyl)ethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate ##STR256##
A cold solution (ice-MeOH bath) of allyl (4 R,5 S,6 S)-6-[(1' R)-1'- tert-butyldimethylsilyloxyethyl]-3-[(2-cyanoethyl)-thio]-4-[2"-(1-pyrrolid inyl)ethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate (355 mg, 0.665 mmol) in THF (8 mL) was treated first with acetic acid (500 μL, 8.73 mmol) and dropwise with a 1M solution of tetrabutylammonium fluoride in THF (4.5 mL, 4.5 mmol). The mixture was stirred for 30 min and then was allowed to set in a cold room (5°C) for 114 h. Then solid NaHCO3 (1 g) was added and the mixture was stirred for 30 min. It was applied on three preparative TLC plates (2 mm, elution twice with acetone) to give the title compound (220 gm, 78.8%, Rf 0.2) contaminated with some tetrabutylammonium salts;
IR (neat) νmax : 3600-3200 (OH), 1775 and 1710 cm-1 (C═O);
1 H NMR (CDCl3, 200 MHz) δ: 6.07-5.87 (1H, m, vinylic H), 5.49-5.24 (2H, m, vinylic H), 4.88-4.6 (2H, m, allylic-CH2), 4.293 (1H, dd, J=3.2 Hz, J=10.4 Hz, H-5), 4.17-4.02 (1H, m, H-1'), 3.366 (1H, dd, J=3.2 Hz, J=9.2 Hz, H-6), 3.2-2.8 (9H, CH2 S, (CH2)3 N, H-4), 2.7-2.62 (2H, m, CH2 CN), 2.4-2.2 (1H, m, HC H-4), 2.1-1.8 (5H, m, CH2 CH2, HCH-4) and 1.404 ppm (3H, d, J=6.3 Hz, CH3).
C. (4R,5S,6S)-3-[(2-Cyanoethyl)thio]-6-[(1'R)-1'-hydroxyethyl]-4-[2"-(1-pyrro lidinyl)ethyl]-7-oxo-1-azabicyclo-[3.2.0]hept-2-ene-2-carboxylic acid ##STR257##
To a cold (ice bath) solution of allyl (4 R,5 S,6 S)-3-[(2-cyanoethyl)thio]-6-[(1' R)-1'-hydroxyethyl]-4-[2"-(1-pyrrolidinyl)ethyl]-7-oxo-1-azabicyclo[3.2.0] hept-2-ene-2-carboxylate (220 mg, 0.524 mmol) in CH2 Cl2 (8 mL) was added Pd(PPh3)4 (20 mg) and a 0.5M solution of sodium ethyl-2-hexanoate (1.1 mL, 0.55 mmol) in EtOAc. The mixture was stirred for 30 min after which it was diluted with diethyl ether and a 0.05M aqueous pH 7.0 buffer solution. The organic layer was extracted again with a 0.05M pH 7.4 buffer solution (3×3 mL). The aqueous layers were combined, washed with diethyl ether (25 mL) and passed through a μ-Bondapak C18 reversed phase column (25 g, H2 O, 2→4% CH3 CN2 O) to give the title compound (145 mg, 73%) as a lyophilized powder;
Purity by HPLC: 97.2% (300 nm);
UV (H2 O) λmax : 300 (ε7500);
IR (Nujol) νmax : 1760 and 1600 cm-1 (C═O);
1 H NMR (D2 O, 200 MHz) δ: 4.33-4.24 (1H, m, H-1'), 4.298 (1H, dd, J=2.9 Hz, J=9.3 Hz, H-5), 3.43 (1H, dd, J=2.9 Hz, J=6.8 Hz, H-6), 3.50-2.4 (7H, m, (CH2)3 N, H-4), 3.21-3.07, 3.01-2.90 (2H, 2 sets of m, CH2 --S), 2.88-2.78 (2H, m, CH2 CN), 2.24-1.93 (5H, m, CH2 CH2 and CH2 -4) and 1.336 ppm (3H, d, J=6.3 Hz, CH3).
(4R,5S,6S)-4-(4"-Aminobutyl)-3-[(2-carbamoylethyl)thio]-6-[(1'R)-1'-hydroxy ethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR258## A. Allyl (4R,5S,6S)-4-(4"-azidobutyl)-3-[(2-carbamoylethyl)thio]-6-[(1'R)-1'-hydrox yethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate ##STR259##
A solution of allyl (4R,5R,6S)-4-(4"-azidobutyl)-6-[(1'R)-1'-hydroxyethyl]-3,7-dioxo-1-azabicy clo[3.2.0]heptane-2-carboxylate (5.28 mmol, prepared by cyclization of 2.0 g, 5.28 mmol of diazo precursor as described in Example 45) in dry acetonitrile (40 mL) was treated at 0°-5°C and under nitrogen with diphenyl chlorophosphate (1.20 mL, 5.8 mmol) and N,N-diisopropylethylamine (1.0 mL, 5.74 mmol) added simultaneously over 10 min. A small crystal of 4-N,N-dimethylaminopyridine was then added and the mixture was stirred for 1 h. More N,N-diisopropylethylamine (0.92 mL, 5.3 mmol) followed by chlorotrimethysilane (0.67 mL, 5.3 mmol) were added and the mixture was stirred for 10 min. Then N,N-diisopropylethylamine (1.21 mL, 6.9 mmol) followed by 3-mercaptopropionamide (0.73 g, 6.9 mmol)[prepared as described by T. Endo et al., Chemistry Letters. 443 (1974) and C. M. Buess, J. Am. Chem. Soc., 77, 6613 (1955)] in N,N-dimethylformamide (2 mL) were added and the solution was then stirred at 0°-5°C for 18 h. The reaction mixture was quenched by the addition of EtOAc (300 mL) and cold water. The organic phase was washed with saturated NaHCO3, 0.2M pH 7.0 phosphate buffer, brine and dried (MgSO4). Evaporation of the solvent gave an oil which was diluted with tetrahydrofuran (20 mL) and water (5 mL) and treated with acetic acid (2 mL). After 1 h at 22°C and 18 h at 5°C, the solution was diluted with EtOAc (300 mL) and washed as above. After drying (MgSO4) and evaporation of the solvent, the residue was chromatographed on silica gel (5×10 cm) using a gradient of ethanol (0-10%) in EtOAc as eluent. Evaporation of the UV active fractions gave 1.06 g (46%) of the title ester as an oil:
IR (NaCl, film) νmax : 2100 (N3), 1770 (C═O of β-lactam), 1710 (sh C═O of ester) and 1680 cm-1 (C═O of amide);
1 H NMR (200 MHz, CDCl3) δ: 1.38 (d, J=6.27 Hz, 3H, CH3 CHO), 1.3-1.9 (m, 6H, CH2 -1,2,3 of azidobutyl), 2.05 (d, J=2.0 Hz, 1H, OH), 2.53 (.about. t, J=7 Hz, 2H, S CH2 CH2 CONH2), 3.0-3.3 (m, 4H, S CH2, H-6 and H-4 overlapping), 3.33 (t, J=6.1 Hz, 2H, CH2 N3), 4.26 (dd, JH5,H6 =2.61 Hz, JH5,H4 =9.37 Hz, 1H, H-5), 4.26 (overlapping with H-5, 1H, CH3 CHO), 4.75 (m, 2H, CH2 of allyl), 5.2-5.5 and 5.9-6.1 (2×m, 2H and 1H, CH of allyl), 5.5 and 5.6 ppm (2 broad s, 2×1H, CON H2).
B. (4R,5S,6S)-4-(4"-Aminobutyl)-3-[(2-carbamoylethyl)thio]-6-[(1'R)-1'-hydrox yethyl]-7-oxo-1-azabicyclo-[3.2.0]hept-2-ene-2-carboxylic acid ##STR260##
A solution of allyl (4R,5S,6S)-4-(4"-azidobutyl)-3-[(2-carbamoylethyl)thio]-6-[(1'R)-1'-hydrox yethyl]-7-oxo-1-aza-bicyclo[3.2.0]hept-2-ene-2-carboxylate (1.06 g, 2.42 mmol) in EtOAc (50 mL) was treated at 22°C and under nitrogen with tetrakis(triphenylphosphine)palladium [0] (0.074 g) and 5.3 mL (2.65 mmol) of a 0.5M solution of potassium 2-ethylhexanoate in EtOAc. After 30 min, the reaction mixture was extracted with water (2×50 mL) and the combined aqueous phase was maintained under vacuum to remove traces of organic solvent. The aqueous phase was then hydrogenated over 1.25 g of 5% palladium over alumina at 0°-5°C and under 45 psi of hydrogen for 1 h. After the addition of 20 mL of 0.2M pH 6.0 phosphate buffer, the catalyst was filtered and the filtrate was chromatographed twice on reversed phase silica gel (μ-Bondapak c-18, 3.5×15 cm). Elution with a gradient of acetonitrile (0-5%) in water gave 0.36 g (40%) of the title compound as a white amorphous powder (93% pure by hplc) after freeze drying. The purity can be increased to 99% by another chromatography on the same column using 0.01M pH 7.0 phosphate buffer instead of water followed by desalting of the product:
Purity by HPLC: 99.5% on μ-Bondapak c-18, 3.9 mm×30 cm, elution 5% CH3 CN--H2 O, pH 7.4 phosphate buffer, flow rate 0.7 mLin, UV detector 304 nm, retention time 6.96 min;
UV (H2 O, pH 7.4 phosphate buffer) λmax : 302 nm (8,865);
IR (KBr) νmax : 1750 (C═O of β-lactam), 1670 (C═O of amide) and 1590 cm-1 (C═O of carboxylate);
1 H NMR (200 MHz, D2 O) δ: 1.33 (d, J=6.37 Hz, 3H, CH3 CHO), 1.3-2.0 (m, 6H, CH2 -1,2 and 3 of butyl), 2.60 (.about. t, J=6.4 Hz, 2H, CH2 CONH2), 2.9-3.2 (m, 4H, S CH2 and CH2 NH2 overlapping), 3.4 (m, 2H, H-4 and H-6), 4.23 (dd, JH5,H6 =2.6 Hz, JH5,H4 =9.15 Hz, 1H, H-5) and 4.27 ppm (m, 1H, CH3 CHO).
(4R,5S,6S)-3-[(2"-cyanoethyl)thio]-4-(2-N-formimidoylaminoethyl)-6-[(1'R)-1 '-hydroxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR261##
A solution of (4R,5S,6S)-4-(2"-aminoethyl)-3-[(2-cyanoethyl)thio]-6-[(1'R)-1'-hydroxyeth yl]-7-oxo-1-azabicyclo[3.2.0]-hept-2-ene-2-carboxylic acid (0.290 g, 0.89 mmol) in 35 mL of cold (0°-5°C) water was adjusted to pH 8.5 with 1M NaOH and treated with benzyl formimidate hydrochloride (0.76 g, 4.4 mmol) added in small portions over 10 min while maintaining the pH to 8-8.5 (1N NaOH). After 20 min, the reaction mixture was quenched by addition of 25 mL of 0.2M pH 6.0 phosphate buffer and washed with EtOAc. The aqueous phase was maintained under vacuum to remove traces of organic solvent and then chromatographed on reverse phase silica gel (μ-Bondapak c-18, 3.5×12 cm). The column was eluted first with 0.01M pH 7.0 phosphate buffer. The UV active fractions were combined, lyophilized and desalted on the same column using water as eluent. After freeze drying, the title compound was obtained as a white amorphous powder (0.120 g, 38%):
Purity by HPLC: 99% on μ-Bondapak c-18, 3.9 mm×30 cm, elution 1.5% CH3 CN--H2 O, pH 7.4 phosphate buffer, flow rate 1 mLin, UV detector 300 nm, retention time 4.91 min;
UV (H2 O, pH 7.4 phosphate buffer) λmax : 300 nm (7,429);
IR (KBr) νmax : 2250 (weak CN), 1755 (C═O of β-lactam), 1610 (C═N of formimidoyl) and 1580 cm-1 (C═O of carboxylate);
1 H NMR (200 MHz, D2 O) δ: 1.34 (d, J=6.37 Hz, 3H, CH3 CHO), 1.8-2.3 (m, 2H, CH2 -1 of aminoethyl), 2.8-3.2 (m, 4H, S CH2 CH2 CN), 3.45 (overlapping with H-6, 1H, H-4), 3.47 (dd, JH6,H5 =2.92 Hz, JH6,H1 =6.87 Hz, 1H, H-6), 4.28 (m, 1H, CH3 C HO), 4.32 (dd, JH5,H6 =2.92 Hz, JH5,H4 =6.68 Hz, 1H, H-5), and 7.85 ppm (s, 1H, C H═NH).
(4R,5S,6S)-4-(3"-Aminopropyl)-3-[(2-carbamoyloxyethyl)thio]-6-[(1'R)-1'-hyd roxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR262## A. Allyl (4R,5S,6S)-4-(3"-azidopropyl)-3-[(2-carbamoyloxyethyl)thio]-6-[(1'R)-1'-hy droxyethyl]-7-oxo-1-azabicyclo-[3.2.0]-hept-2-ene-2-carboxylate ##STR263##
A cold (ice-MeOH bath) solution of allyl (4 R,5 S,6 S)-4-(3"-azidopropyl)-3-[(2-carbamoyloxyethyl)thio]-6-[(1' R)-1'-hydroxyethyl]-3,7-dioxo-1-azabicyclo[3.2.0]heptan-2-carboxylate, prepared from (3 S,4 R)-3-[(1' R)-1'-hydroxyethyl]-4-[(1' R)-1"-(3-azidopropyl)-3"-diazo-3"-allyloxycarbonyl-2"-oxopropyl]azetidin-2 -one (2.0 g, 5.49 mmol), in CH3 CN (40 mL) was treated with diphenyl chlorophosphate (1.3 mL, 6.0 mmol), N,N-diisopropylethylamine (0.98 mL, 6.0 mmol) and a trace of 4-dimethylaminopyridine. The mixture was stirred for 40 min then the resulting enol phosphate was treated with 2-carbamoyloxyethyl mercaptan (1.33 g, 11.0 mmol) and N,N-diisopropylethylamine (1.7 mL, 11.0 mmol). The mixture was stirred for 24 h at 5°C then it was treated again with more 2-carbamoyloxyethyl mercaptan (0.65 mL, 5.5 mmol) and N,N-diisopropylethylamine (0.88 mL, 5.5 mmol). After a stirring period of 35 h more, the mixture was diluted with ethyl acetate (200 mL), washed with cold water (2×50 mL), cold 1M aqueous NaHSO3 (2×50 mL), water (50 mL), 1N aqueous HCl (50 mL), water (50 mL), 1M aqueous NaHCO3 (50 mL), water (50 mL), brine (50 mL) and dried (MgSO4). The residue was passed through a silica gel pad (25 g, hexane→ethyl acetate) to give the title compound (1.29 g, 53%) as a yellow semi-crystalline compound;
IR (CH2 Cl2) νmax : 3680, 3600, 3540, 3420 (OH, NH2), 2100 (N3), 1775, 1740 and 1710 cm-1 (C═O);
1 H NMR (CDCl3, 200 MHz) δ: 6.04-5.87 (1H, m, vinylic-H), 5.50-5.22 (2H, m, vinylic-H), 4.88-4.63 (4H, m, NH2 and allylic-CH2), 4.37-4.10 (4H, m, H-1', CH2 O and H-4), 4.276 (part of H-4, d, J=2.7 Hz), 3.49-3.35 (3H, m, CH2 N3 and H-4), 3.247 (1H, dd, J=2.7 Hz, J=7.5 Hz, H-6), 3.8-3.09, 2.97-2.63 (2H, 2 sets of m, SCH2), 1.96-1.55 (3H, m, OH and CH2 CH2) and 1.388 ppm (3H, d, J=6.3 Hz, CH3).
B. (4R,5S,6S)-4-(3"-Aminopropyl)-3-[(2-carbamoyloxyethyl)thio]-6-[(1'R)-1'-hy droxyethyl]-7-oxo-1-azabicyclo-[3.2.0]hept-2-ene-2-carboxylic acid ##STR264##
A cold solution (ice bath) of allyl (4 R,5 S,6 S)-4-(3"-azidopropyl)-3-[(2-carbamoxyloxyethyl)thio]-6-[(1' R)-1'-hydroxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate (520 mg, 1.18 mmol) in CH2 Cl2 (50 mL) was treated with (PPh3)4 Pd (110 mg, 0.09 mmol) and dropwise with a 0.5M solution of sodium ethyl-2-hexanoate (2.36 mL, 1.18 mmol) in ethyl acetate. The mixture was stirred for 20 min, diluted with diethyl ether (150 mL) and extracted with water (2×20 mL). The aqueous extracts were combined, washed with diethyl ether (2×30 mL) and shaken in a Parr hydrogenator at 45-50 psi hydrogen for 2 h at 0°C using 5% Pdlumina (500 mg) as catalyst. The pH of the solution was adjusted to 6.9 with a 1M aqueous KH2 PO4 solution. The catalyst was removed by filtration and the aqueous solution was passed twice through a μBondapak C18 reversed phase column (120 g, H2 O→1%→3% CH3 CN/H2 O) to give the title compound (155 mg, 35%) lyophilized powder;
Purity: 99.0% (HPLC, 300 nm);
UV (H2 O) λmax : 302 (ε10600);
IR (Nujol) νmax : 1755, 1710 and 1585 cm-1 (C═O);
1 H NMR (D2 O, 200 MHz) δ: 4.34-4.21 (4H, m, H-1', H-5 and CH2 O), 3.47-3.35 (1H, m, H-4), 3.356 (1H, dd, J=2.7 Hz, J=6.5 Hz, H-6), 3.21-2.88 (4H, m, CH2 N, SCH2), 2.0-1.4 (4H, m, CH2 CH2) and 1.334 ppm (3H, d, J=6.3 Hz, CH3).
(4R,5S,6S)-4-(2"-Aminoethyl)-3-[(1-methyl-1,2,3-triazol-4-yl)methylthio]-6- [(1'R)-1'-hydroxyethyl]-7-oxo-1-azabicyclo-[3.2.0]hept-2-ene-2-carboxylic acid ##STR265## A. Allyl (4R,5S,6S)-(2"-azidoethyl)-6-[(1'R)-1'-tert-butyldimethylsilyloxyethyl]-3- [(1-methyl-1,2,3-triazol-4-yl)-methylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2- ene-2-carboxylate ##STR266##
A solution of allyl (4R,5R,6S)-4-(2"-azidoethyl)-6-[(1'R)-1'-tert-butyldimethylsilyloxyethyl]- 3,7-dioxo-1-azabicyclo[3.2.0]heptane-2-carboxylate (4.69 mmol, prepared by cyclization of 2.18 g, 4.69 mmol of the diazo precursor as described in Example 2) in dry acetonitrile (36 mL) was treated at -15°C and under Argon with diphenyl chlorophosphate (1.02 mL, 4.9 mmol) and N,N-diisopropylethylamine (0.87 mL, 5.0 mmol). A small crystal of 4-N,N-dimethylaminopyridine was added and the mixture was stirred at -15°C for 30 min. N,N-Diisopropylethylamine (0.87 mL, 5.0 mmol) and 1-methyl4-thiomethyl-1,2,3-triazole (1.22 g, 9.4 mmol) were added and the mixture was stirred overnight at -15°C The reaction mixture was diluted with EtOAc (250 mL) and mixed with a mixture coming from a similar experiment starting from 0.54 mmol of the diazo precursor. The resulting solution was washed with water, 1M NaHSO3 saturated NaHCO3, brine and dried (MgSO4). Evaporation of the solvent gave an oil which was chromatographed on silica gel (5×15 cm). Elution with a mixture of EtOAc and toluene (7:13) gave 1.99 g (69%) of the title compound as a brown oil:
IR (Nujol) νmax : 2105 (N3), 1775 (C═O of β-lactam) and 1710 (C═O of ester).
1 H NMR (200 MHz, CDCl3) δ: 0.09 (s, 6H, SiCH3), 0.89 (s, 9H, Si-t-bu), 1.29 (d, J=6.14 Hz, 3H, C H3 CHO), 1.72 and 2.04 (2×m, 2×1H, CH2 -4), 3.10 (dd, J1'6 =7.19 Hz, J5-6 =2.73 Hz, 1H, H-6), 3.30-3.64 (m, 2H, CH2 N3), 3.65 (ddd, J4-5 =J=10.06 Hz, J=2.73 Hz, 1H, H-4), 4.01 (d, Jgem =14.62 Hz, 1H, CH2 --S), 4.02-4.35 (m, 2H, H-5 and CH3 C HO), 4.08 (s, 3H, CH3 --N) 4.26 (d, Jgem =14.58 Hz, 1H, CH2 --S), 4.72 (m, 2H, CH2 of allyl), 5.21-5.47 and 5.95 (2×m, 2H and 1H, CH of allyl), 7.48 (s, 1H, CH of triazole).
B. Allyl (4R,5S,6S)-4-(2"-azidoethyl)-3-[(1-methyl-1,2,3-triazol-4-yl)methylthio]-6 -[(1'R)-1'-hydroxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate ##STR267##
A solution of allyl (4R,5S,6S)-4-(2"-azidoethyl)-6-[(1'R)-1'-tert-butyldimethylsilyloxyethyl]- 3-[(1-methyl-1,2,3-triazol-4-yl)methylthio]-7-oxo-1-azabicyclo[3-2.0]hept-2 -ene-2-carboxylate (1.99 g, 3.63 mmol) in dry tetrahydrofuran (57 mL) was treated at 0°-5°C and under Argon with acetic acid (1.25 mL, 21.8 mmol) followed by 11.3 mL (11.3 mmol) of 1M solution of tetrabutylammonium fluoride in tetrahydrofuran. The solution was stored at 5°C for 10 days. The reaction mixture was then diluted with EtOAc, washed with saturated NaHCO3, brine and dried (MgSO4). Evaporation of the solvent gave an oil which was chromatographed on silica gel (5×15 cm). Elution with a mixture of acetonitrile and EtOAc (3:97) gave 1.09 g (48%, yield from the diazo azetidinone) of the title compound as a foamy light yellow solid:
IR (NaCl, film) νmax : 3490 (OH), 2105 (N3), 1780 (C═O of β-lactam), and 1710 (C═O of ester).
1 H NMR (200 MHz, CDCl3) δ: 1.38 (d, J=6.26 Hz, 3H, C H3 CHO), 1.78 and 2.02-2.18 (2×m, 2×1H, CH2 -4), 2.07 (d, J=4.42 Hz, 1H, OH), 3.17 (dd, J1'6 =7.71 Hz, J5-6 =2.76 Hz, H-6), 3.39-3.65 (m 2H, CH2 N3), 3.74 (ddd, J4-5 :10,40 Hz, J=10.40 Hz, J=2.42 Hz, H-4), 3.95 (d, Jgem =14.89 Hz, 1H, CH2 --S), 4.08 (s, 3H, CH3 --N), 4.14-4.27 (m, 1H, CH3 C HO), 4.21 (dd, J4-5 =9.54 Hz, J5-6 =2.69 Hz, H-5), 4.28 (d, Jgem =15.05 Hz, 1H, CH2 --S), 4.73 (m, 2H, CH2 of allyl), 5.22-5.48 and 5.94 (2×m, 2H and 1H, CH of allyl), 7.48 (s, 1H, CH of triazole).
C. (4R,5S,6S)-4-(2"-Aminoethyl)-3-[(1-methyl-1,2,3-triazol-4-yl)methylthio]-6 -[(1'R)-1'-hydroxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR268##
A solution of allyl (4R,5S,6S)-4-(2"-azidoethyl)-3-[(1-methyl-1,2,3-triazol-4-yl)methylthio]-6 -[(1'R)-1'-hydroxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate (495 mg, 1.14 mmol) in dry CH2 Cl2 (25 mL) was treated at 0°-5°C and under Argon, with tetrakis(triphenylphosphine)palladium [0] (83 mg) and 2.5 mL (1.25 mmol) of a 0.5M solution of sodium 2-ethylhexanoate in EtOAc. Then 50 mL of water were added and the organic layer was separated. The organic phase was re-extracted with 3×15 mL of water and the combined aqueous layers were pumped to remove organic solvent. The residual aqueous phase was hydrogenated over 419 mg of 5% palladium on alumina and under 45 psi of hydrogen for 1 hour. The catalyst was filtered and the filtrate was neutralized with a solution of NaH2 PO4 1M (a few drops). The mixture was chromatographed on reversed phase silica gel (ε-bondapak c-18, 7×11 cm) using gradient of acetonitrile in water (0-1%) followed by lyophilization of the UV active fractions gave 290 mg (69%) of the title compound as a light yellow amorphous powder:
Purity by HPLC: 97.3% on μ-bondapak c-18, 3.9 mm×30 cm, elution 1.5% acetonitrile in water pH 7.4 phosphate buffer, flow rate 1 mLin, UV detector 302 nm, retention time 5.82 min;
UV (H2 O, pH 7.4 phosphate buffer) λmax : 302 nm (6091);
IR (KBr) νmax : 1760 (C═O of β-lactam) and 1600 (C═O of carboxylate);
1 H NMR (200 Hz, D2 O) δ: 1.31 (d, J=6.34 Hz, 3H, C H3 CHO), 1.80 and 2.17 (2×m, 2×1H, CH2 -4), 3.09 (t, J=8.33 Hz, CH2 N3), 3.32 (ddd, J4-5 =J=10.06 Hz, J=3.06 Hz, 1H, H-4), 3.41 (dd, J7'-6 =6.56 Hz, J5-6 =2.79 Hz, H-6), 3.95-4.28 (m, 4H, CH2 --S, CH3 C HO, H-5), 4.08 (s, 3H, CH3 --N), 7.85 (s, 1H, CH of triazol).
(4R,5S,6S)-3-[(3-cyanopropyl)thio]-4-(4"-N-formimidoylaminobutyl)-6-[(1'R)- 1'-hydroxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR269##
A solution of (4R,5S,6S)-4-(4"-aminobutyl)-3-[(3-cyanopropyl)thio]-6-[(1'R)-1'-hydroxyet hyl]-7-oxo-1-azabicyclo-[3.2.0]hept-2-ene-2-carboxylic acid (0.411 g, 1.12 mmol) in water (50 mL) was adjusted to pH 8.5 with 1M NaOH. Then benzylformimidate hydrochloride (0.94 g, 5.4 mmol) was added in small portions over 5 min while maintaining the pH to 8-8.5 with 1M NaOH. After 20 min, 40 mL of 0.2M pH 6.0 phosphate buffer was added and the solution was washed with ethyl acetate and the aqueous phase was maintained under vacuum to remove traces of organic solvent. The aqueous solution was chromatographed at 0°-5°C on reversed phase silica gel (3.5×15 cm, μ-Bondapak) using a gradient of acetonitrile (0-10%) in 0.01M pH 7.0 phosphate buffer. The UV active fractions were combined, concentrated under vacuum (t<10°C) and desalted on the same column using water and acetonitrile (0-10%) as eluent. The title compound was obtained as a white amorphous powder (0.224 g, 50%) after freeze drying:
Purity by HPLC: 99% on μBondapak C18, 3.9 mm×30 cm, elution 8% CH3 CN--H2 O, pH 7.4 phosphate buffer, flow rate 1 mLin, uv detector 304 nm, retention time 6.85 min;
UV (H2 O, pH 7.4 phosphate buffer) λmax : 304 nm (9,324);
IR (KBr) νmax : 2250 (CN), 1755 (C═O of B-lactam), 1715 (C═N of formimidoyl) and 1590 cm-1 (C═O of carboxylate);
1 H NMR (200 MHz, D2 O) δ: 1.32 (d, J=6.31 Hz, 3H, CH3 CHO), 1.3-2.1 (m, 8H, CH2 -1,2 and 3 of butyl and CH2 -2 of cyanopropyl), 2.64 (t, J=6.9 Hz, 2H, CH2 CN), 2.7-3.1 (m, 2H, SCH2), 3.35 (m, 4H, CH2 NH, H-4 and H-6 overlapping), 4.2-4.4 (m, 2H, H-5 and CH3 CHO overlapping) and 7.79 ppm (s, 1H,
(4R,5S,6S)-4-(4"-N N-Dimethylaminobutyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(pyridin-3-yl)methylthi o]-7-oxo-1-azabicyclo[3.2.0]-hept-2-ene-2-carboxylic acid ##STR270##
A solution of (4R,5S,6S)-4-(4"-aminobutyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(pyridin-3-yl)me thylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid (0.221 g, 0.56 mmol) in 5 mL of cold water (0°-5°C) was treated with 37% w formaldehyde (0.23 mL, 2.8 mmol) and acetic acid (0.2 mL, 3.5 mmol). The resulting pH was 4∅ Then 0.071 g (1.1 mmol) of sodium borohydride was added all at once followed by another 0.130 g (2.1 mmol) added in small portions over 2 h. The reaction mixture was then quenched by addition of 20 mL of 0.2M pH 7.0 phosphate buffer and then chromatographed on reversed phase silica gel (μBondapak Cl18, 2×15 cm). Elution with a gradient of acetonitrile (0-5%) in water gave 0.161 g (68%) of the title compound as a white amorphous solid after freeze drying:
Purity by HPLC: 94% on μBondapak C18, 3.9 mm/30 cm, elution 10% CH3 CN--H2 O pH 7.4 phosphate buffer, flow rate 1.5 mL/min, uv detector 300 nm, retention time 8.19 min;
UV (water, pH 7.4 phosphate buffer) λmax : 266 (4980) and 304 nm (7.540);
IR (KBr) νmax : 1758 (C═O of β-lactam) and 1582 cm-1 (C═O of carboxylate);
1 H NMR (200 MHz, D2 O) δ: 1.29 (d, J=6.34 Hz, 3H, CH3 CHO), 1.2-1.8 (m, 6H, CH2 -1,2 and 3 of butyl), 2.86 (s, 6H, NCH3), 3.1 (m, 3H, CH2 N and H-4), 3.29 (dd, JH6,H5 =2.54 Hz, JH6,H1 =6.35 Hz, 1H, H-6), 4.08 (ABq, JAB =14.9 Hz, Δν=24.2 Hz, 2H, SCH2), 4.08 (overlapping with SCH2, 1H, H-5), 4.22 (m, 1H, CH3 CHO), 7.45 (dd, J=4.9 Hz, and J=7.9 Hz, 1H, H-5 of pyridine), 7.9 (m, 1H, H-4 of pyridine), 8.44 (dd, J=1.5 Hz, and J=4.9 Hz, 1H, H-6 of pyridine) and 8.53 ppm (d, J=1.8 Hz, 1H, H-2 of pyridine).
(4R,5S,6S)-4-(4"-N-Formimidoylaminobutyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(1-m ethyl-1,2,3-triazol-4-yl)methylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2- carboxylic acid ##STR271##
A solution of (4R,5S,6S)-4-(4"-aminobutyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(1-methyl-1,2,3- triazol-4-yl)methylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid (0.296 g, 0.75 mmol) [prepared in Example 62] in water (30 mL) was treated at 0°-5°C with benzylformimidate hydrochloride (0.65 g, 3.8 mmol) added in small portions over 10 min while maintaining the pH to 8-8.5 with 1M NaOH. After 30 min, 25 mL of 0.2M pH 6.0 phosphate buffer were added and the resulting mixture was washed with EtOAc (20 mL). The aqueous phase was maintained under vacuum to remove traces of organic solvent and then chromatographed on reversed phase silica gel (μ-Bondapak c-18, 3.5×14 cm). The column was eluted first with a gradient of CH3 CN (0-8%) in 0.01M pH 7 phosphate buffer. The UV active fractions were concentrated in vacuo (T<15°C) and chromatographed again on the same column using water instead of buffer. Lyophilization of the UV active fractions gave 0.21 g (66%) of the title compound as a white amorphous powder:
Purity by HPLC: 98% on μ-Bondapak c-18, 3.9 mm×30 cm, elution 8% CH3 CN--H2 O, pH 7.4 phosphate buffer, flow rate 1 mLin, uv detector 304 nm, retention time 6.34 min;
UV (H2 O, pH 7.4 phosphate buffer) λmax : 302 nm (8,586);
IR (KBr) νmax : 1755 (C═O of β-lactam), 1715 (C═N of formimidoyl) and 1590 cm-1 (C═O of carboxylate);
1 H NMR (200 MHz, D2 O) δ: 1.30 (d, J=6.36 Hz, 3H, CH3 CHO), 1.3-1.9 (m, 6H, CH2 -1,2 and 3 of butyl), 3.1-3.5 (m, 4H, H-4, H-6 and CH2 -4 of butyl overlapping), 4.08 (s, 3H, CH3 -1 of triazole), 4.09 (ABq, JAB =14.85 Hz, Δν=31.9 Hz, 2H, SCH2), 4.15 (overlapping SCH2 and CH3, 1H, H-5), 4.27 (m, 1H, CH3 CHO), 7.8 (broad S, 1H, CH═NH) and 7.87 ppm (s, 1H, H-5 of triazole).
(4R,5S,6S)-4-(4"-Aminobutyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(2-hydroxyethyl)t hio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR272## A. Allyl (4R,5S,6S)-4-(4"-azidobutyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(2-hydroxyethyl) thio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate ##STR273##
A solution of allyl (4R,5R,6S)-4-(4"-azidobutyl)-6-[(1'R)-1'-hydroxyethyl]-3,7-dioxo-1-azabicy clo[3.2.0]heptane-2-carboxylate (11.8 mmol, prepared by cyclization of 4.47 g, 11.8 mmol of diazo precursor as in Example 45) in dry acetonitrile (50 mL) was cooled to 0°-5°C and treated with diphenyl chlorophosphate (2.57 mL, 12.4 mmol) and N,N-diisopropylethylamine (2.16 mL, 12.4 mmol) added simultaneously over 5 min. After 1 h, N,N-diisopropylethylamine (2.16 mL, 12.4 mmol) followed by chlorotrimethylsilane (1.57 mL, 12.4 mmol) were added dropwise over 5 min. Then more N,N-diisopropylethylamine (2.16 mL, 12.4 mmol) and 2-mercaptoethanol (1.84 g, 23.5 mmol) were added and the mixture was stirred at 0°-5°C for 16 h. The reaction mixture was then diluted with ethyl acetate (500 mL), washed with cold water, brine and dried (MgSO4). Evaporation of the solvent gave an oil which was then diluted with tetrahydrofuran (100 mL) and water (20 mL) and treated with acetic acid (2 mL) at 20°C for 2 h. The solution was diluted again with ethyl acetate, washed with saturated NaHCO3, 0.2M pH 7.0 phosphate buffer and brine. After drying over anhydrous MgSO4, evaporation of the solvent gave an oil which was chromatographed on silica gel (4.5×10 cm). Elution with a mixture of toluene and ethyl acetate (1:1) gave 2.56 g (52%) of the title compound as an oil:
IR (NaCl, film) νmax : 2100 (N3), 1765 (C═O of β-lactam) and 1705 cm-1 (C═O of ester);
1 H NMR (200 MHz, CDCl3) δ: 1.38 (d, J=6.29 Hz, 3H, CH3 CHO), 1.3-2.0 (m, 6H, CH2 -1,2 and 3 of butyl), 2.8-3.2 (m, 2H, S CH2 CH2 OH), 3.18 (dd, JH6,H5 =2.60 Hz, JH6,H1 =7.18 Hz, 1H, H-6), 3.3 (m, 3H, CH2 N3 and H'-4 overlapping), 3.82 (t, J=6.0 Hz, 2H, SCH2 CH2 OH), 4.1-4.3 (m, 2H, H-5 and CH3 CHO overlapping), 4.75 (m, 2H, CH2 of allyl), 5.2-5.5 and 5.9-6.1 ppm (2×m, 2H and 1H, CH of allyl).
B. (4R,5S,6S)-4-(4"-Aminobutyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(2-hydroxyethyl) thio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR274##
A solution of allyl (4R,5S,6S)-4-(4"-azidobutyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(2-hydroxyethyl) thio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate (2.56 g, 6.2 mmol) in dry ethyl acetate (60 mL) was treated at 22°C and under nitrogen, with tetrakis(triphenylphosphine)palladium [0] (0.15 g) and 1.25 g (6.9 mmol) of potassium 2-ethylhexanoate. After 2 h, the reaction mixture was extracted with cold water (3×50 mL) and the combined aqueous phase was chromatographed on reversed phase silica gel (μBondapak C18, 3×13 cm, elution 5% CH3 CN--H2 O). The intermediate potassium salt (1.4 g) was then hydrogenated at 0°-5°C in water (200 mL) over 2.0 g of 5% palladium on alumina under 45 psi of hydrogen for 45 min. After the addition of 60 mL of 0.2M pH 6.0 phosphate buffer, the catalyst was filtered and the filtrate was chromatographed on reversed phase silica gel (μBondapak C18, 3×13 cm). Elution with a gradient of acetonitrile (0-5%) in water gave 0.689 g (32%) of the title compound as a white amorphous solid after freeze drying: [α]D24 +74.00 (c 1.0, H2 O);
Purity by HPLC: 99% on μBondapak C18, 3.9 mm×30 cm, elution with pH 7.4 phosphate buffer, flow rate 1 mLin, retention time (9.68 min);
UV (H2 O, pH 7.4 phosphate buffer) λmax : 304 nm (7,616);
IR (KBr) νmax : 1750 (C═O of β-lactam) and 1585 cm-1 (C═O of carboxylate);
1 H NMR (200 MHz, D2 O): 1.33 (d, J=6.38 Hz, 3H, CH3 CHO) 1.3-1.9 (m, 6H, CH2 -1,2 and 3 of butyl), 2.8-3.1 (m, 2H, S CH2 CH2 OH), 3.02 (t, J=7.6 Hz, 2H, CH2 NH2), 3.36 (m, 2H, H-4 and H-6 overlapping), 3.77 (t, J=6.2 Hz, 2H, SCH2 CH2 OH), 4.22 (dd, JH5,H6 =2.43 Hz, 1H, H-5) and 4.26 ppm (m, overlapping with H-5, 1H, CH3 CHO).
(4R,5S,6S)-3-[(2-Cyanoethyl)thio]-4-(4"-quanidinobutyl)-6-[(1'R)-1'-hydroxy ethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR275##
A solution of (4R,5S,6S)-4-(4"-aminobutyl)-3-[(2-cyanoethyl)thio]-6-[(1'R)-1'-hydroxyeth yl]-7-oxo-1-azabicyclo [3.2.0]hept-2-ene-2-carboxylic acid (0.300 g, 0.85 mmol) [prepared in Example 17] in cold (0°-5°C) water (20 mL) was adjusted to pH 8.0 with 1M NaOH and then treated with aminoiminomethanesulfonic acid (0.35 g, 2.8 mmol) [K. Kim et al., Tetrahedron Lett., 29, 3183 (1988)] added in small portions over 5 min. The pH was maintained at 8-8.5 with 1M NaOH during the addition and for two hours. Then 10 mL of pH 6.0 0.2M phosphate buffer were added and the solution was chromatographed on reversed phase silica gel (μ-Bondapak c-18, 2.5×14 cm). Elution with a gradient of acetonitrile (0-5%) in water gave 0.257 (77%) of the title compound as a white amorphous powder after freeze drying: [α]D22 +45.5° (c 1.0, H2 O);
Purity by HPLC: 99% on μ-Bondapak c-18, 3.9 mm×30 cm, elution 5% CH3 CN--H2 O, pH 7.4 phosphate buffer, flow rate 1 mLin, uv detector 300 nm, retention time 11.1 min;
UV (H2 O, pH 7.4 phosphate buffer) λmax : 302 nm (8,676);
IR (KBr) νmax : 2250 (weak CN), 1755 (C═O of β-lactam), 1665 (C═N of guanidyl) and 1685 cm-1 (C═O of carboxylate);
1 H NMR (200 MHz, D2 O) δ: 1.32 (d, J=6.39 Hz, 3H, CH3 CHO), 1.3-1.9 (m, 6H, CH2 -1,2 and 3 of butyl), 2.8-3.3 (m, 4H, S CH2 CH2 CN), 3.22 (t, J=6.5 Hz, CH2 NH), 3.36 (dd, JH6,H5 =2.34 Hz, JH6,H1 =6.22 Hz, 1H, H-6), 3.4 (overlapping with H-6, 1H, H-4) and 4.2-4.4 ppm (m, 2H, H-5 and CH3 CHO overlapping).
(4R,5S,6S)-3-[(2-Cyanoethyl)thio]-4-(2"-guanidinoethyl)-6-[(1'R)-1'-hydroxy ethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR276##
A solution of (4R,5S,6S)-4-(2"-aminoethyl)-3-[(2-cyanoethyl)thio]-6-[(1'R)-1'-hydroxyeth yl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid (0.185 g, 0.57 mmol) [prepared in Example 36] in cold (0°-5°C) water (20 mL) was treated with aminoiminomethanesulfonic acid (0.35 g, 2.8 mmol) [K. Kim et al., Tetrahedron Lett., 29, 3183 (1988)] added in small portions over 5 min while maintaining the pH to 8-8.5 with 1M NaOH. The pH was maintained between 8 and 8.5 over 1 h and the reaction mixture was then quenched by addition of 5 mL of 0.2M pH 6.0 phosphate buffer. The solution was chromatographed on reversed phase silica gel (μ-Bondapak c-18, 2.5×14 cm) using a gradient of acetonitrile (0-2%) in water as eluent. Lyophilization of the UV active fractions gave 0.035 g (17%) of the title compound as a white amorphous powder after freeze drying:
Purity by HPLC: 99% on μ-Bondapak c-18, 3.9 mmB 30 cm, elution 2% CH3 CN--H2 O, pH 7.4 phosphate buffer, flow rate 1 mL/min, UV detector 300 nm, retention time 5.98 min;
UV (H2 O, pH 7.4 phosphate buffer) λmax : 300 nm (7,483);
IR (KBr) νmax : 2255 (weak CN), 1755 (C═O of β-lactam), 1660 (C═N of guanidine) and 1590 cm-1 (C═O of carboxylate);
1 H NMR (200 MHz, D2 O) δ: 1.34 (d, J=6.34 Hz, 3H, CH3 CHO), 1.7-2.3 (m, 2H, CH2 -1 of guanidinoethyl), 2.7-3.4 (m, 7H, S CH2 CH2 CN, CH2 -2 of guanidinoethyl and H-4), 3.45 (dd, JH6H5 =2.69 Hz, JH6,H1 =6.8 Hz, 1H, H-6) and 4.3 ppm (m, 2H, H-5 and CH3 C HO overlapping).
(4R,5S,6S)-4-(N-Formimidoyl-4"-aminobutyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(2- hydroxyethyl)thio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR277##
A solution of (4R,5S,6S)-4-(4"-aminobutyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(2-hydroxyethyl) thio]-7-oxo-1-azabicyclo-[3.2.0]hept-2-ene-2-carboxylic acid (0.205 g, 0.59 mmol) in water (20 mL) at 0°-5°C was adjusted to pH 8.5 with 1M NaOH. Then benzyl formimidate hydrochloride (0.39 g, 2.27 mmol) was added in small portions (10 min) while maintaining the pH to 8-8.5 with 1M NaOH. After 15 min, the reaction mixture was quenched by the addition of 10 mL of 0.2M pH 6.0 phosphate buffer and washed with ethyl acetate (20 mL). The aqueous phase was then chromatographed on reversed phase silica gel (μBondapak C18, 2×14 cm) using a gradient of acetonitrile (0-2%) in 0.02M pH 7.0 phosphate buffer as eluent. The UV active fractions were combined, concentrated to 50 mL and desalted on the same column using water instead of buffer. Lyophilization of the UV active fractions gave 0.154 g (69%) of the title compound as a white amorphous solid: [α]D24 +67.0° (c 1.0, H2 O);
Purity by HPLC: 99% on μBondapak C18, 3.9 mm×30 cm, elution 2% CH3 CN--H2 O, pH 7.4 phosphate buffer, flow rate 1 mLin, uv detector 300 nm, retention time 10.2 min;
UV (H2 O, pH 7.4 phosphate buffer) λmax : 304 nm (10,105);
IR (KBr) νmax : 1750 (C═O of β-lactam), 1715 (C═N of formimidoyl) and 1590 cm-1 (C═O of carboxylate);
1 H NMR (200 MHz, D2 O) δ: 1.32 (d, J=6.37 Hz, 3H, CH3 CHO), 1.3-1.9 (m, 6H, CH2 -1,2 and 3 of butyl), 2.8-3.1 (m, 2H, S CH2 CH2 OH), 3.3-3.5 (m, 4H, H-4, H-6 and CH2 NH overlapping), 3.77 (t, J=6.21 Hz, 2H, SCH2 CH2 OH), 4.21 (dd, JH5,H6 =2.25 Hz, 1H, H-5), 4.26 (m overlapping with H-5, 1H, CH3 CHO), and 7.78 ppm (broad s, 1H, CH═NH).
(4R,5S,6S)-4-(4"-Aminobutyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(1-N-methylimidaz ol-5-yl)methylthio]-7-oxo-1-azabicyclo-[3.2.0]hept-2-ene-2-carboxylic acid ##STR278## A. Allyl (4R,5S,6S)-4-(4"-azidobutyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(1-N-methylimida zol-5-yl)methylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate ##STR279##
A solution of allyl (4R,5R,6S)-4-(4"-azidobutyl)-6-[(1'R)1'-hydroxyethyl]-3,7-dioxo-1-azabicyc lo[3.2.0]heptane-2-carboxylate (5.28 mmol, prepared by cyclization of 2.0 g, 5.28 mmol of the diazo precursor as in Example 45) in dry CH3 CN (40 mL) was treated at 0°-5°C and under nitrogen with diphenyl chlorophosphate (1.2 mL, 5.8 mmol) and N,N-diisopropylethylamine (1.0 mL, 5.8 mmol) added simultaneously over 5 min. A small crystal of 4-N,N-dimethylaminopyridine was then added and the mixture was stirred for 40 min. More N,N-diisopropylethylamine (1.84 mL, 10.6 mmol) was added, followed by 5-mercaptomethyl-1-N-methyl imidazole (1.35 g, 10.5 mmol) in dry CH3 CN (3 mL). After 3 h, the reaction mixture was diluted with ethyl acetate, washed with water, saturated NaHCO3, brine and dried (MgSO4). After evaporation of the solvent, the residue was chromatographed on silica gel (4.5×10 cm) using a mixture of ethyl acetate, CH3 CN and acetone (8:1:1 to 4:3:3) as eluent. Evaporation of the UV active fractions gave 1.86 g (76%) of the title compound as an oil:
IR (NaCl, film) νmax : 2100 (N3), 1770 (C═O of β-lactam) and 1710 cm-1 (C═O of ester);
1 H NMR (200 MHz, CDCl3) δ: 1.38 (d, J=6.25 Hz, 3H, CH3 CHO), 1.4-1.9 (m, 6H, CH2 -1,2 and 3 of butyl), 3.17 (dd, JH5,H6 =2.72 Hz, JH3,H4 =7.36 Hz, 1H, H-6), 3.2 (m, 1H, H-4) 3.32 (t, J=6.0 Hz, 2H, CH2 N3), 3.68 (s, 3H, CH3 -1 of imidazole), 4.02 (ABq, JAB =14.3 Hz, Δν=33.0 Hz, 2H, SCH2), 4.1-4.3 (m, 2H, H-5 and CH3 CHO), 4.74 (m, 2H, CH2 of allyl), 5.2-5.5 and 5.9-6.1 (2×m, 2H and 1H, CH of allyl), 6.93 (s, 1H, H-4 of imidazole), and 7.42 ppm (s, 1H, H-2 of imidazole).
B. (4R,5S,6S)-4-(4"-Aminobutyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(1-N-methylimida zol-5-yl)methylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR280##
A solution of allyl (4R,5S,6S)-4-(4"-azidobutyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(1-N-methylimida zol-5-yl)methylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate (1.86 g, 4.04 mmol) in ethyl acetate (75 mL) was treated at 22°C and under nitrogen with tetrakis(triphenylphosphine)palladium [0] (0.075 g) and 8.9 mL (4.45 mmol) of a 0.5M solution of potassium 2-ethylhexanoate in ethyl acetate. After 45 min, the reaction mixture was extracted with water (2×75 mL) and the combined aqueous phase was maintained under vacuum to remove traces of organic solvent. The aqueous solution was then hydrogenated at 0°-5°C over 5% palladium on alumina (2.1 g) under 45 psi of hydrogen for 1 h. Then 30 mL of 0.2M pH 6.0 phosphate buffer were added and the catalyst was filtered. The filtrate was chromatographed twice on reversed phase silica gel (μBondapak C18, 3.5×11 cm) using a gradient of acetonitrile (0-8%) in water as eluent. Lyophilization of the UV active fractions gave 0.528 g (33%) of the title compound as a white amorphous powder: [α]D22 -22.4° (c 1.0, H2 O);
Purity by HPLC: 97.3% on μBondapak C18, 3.9 mm×30 cm, elution 8% CH3 CN--H2 O pH 7.4 phosphate buffer, flow rate 1 mLin, uv detector 302 nm, retention time 5.88 min;
UV (water, pH 7.4 phosphate buffer) λmax : 302 nm (7,569);
IR (KBr) νmax : 1755 (C═O of β-lactam) and 1585 cm-1 (C═O of carboxylate);
1 H NMR (200 MHz, D2 O) δ: 1.31 (d, J=6.35 Hz, 3H, CH3 CHO), 1.3-1.8 (m, 6H, CH2 -1,2 and 3 of butyl), 2.99 (t, J=7.6 Hz, 2H, CH2 NH2), 3.22 (broad t, 1H, H-4), 3.33 (dd, JH6,H5 =2.56 Hz, JH6,H1 =6.34 Hz, 1H, H-6), 3.71 (s, 3H, CH3 -1 of imidazole), 4.07 (ABq, JAB =14.8 Hz, Δν=38.45 Hz, 2H, SCH2), 4.13 (dd overlapping with SCH2, JH5,H6 =2.56 Hz, 1H, H-5), 4.24 (m, 1H, CH3 CHO), 6.94 (s, 1H, H-4 of imidazole) and 7.66 ppm (s, 1H, H-2 of imidazole).
(4R,5S,6S)-4-(3"-Aminopropyl)-3-[(2-carbamoylethyl)thio]-6-[(1'R)-1'-hydrox yethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR281## A. Allyl (4R,5S,6S)-4-(3"-azidopropyl)-3-[(2-carbamoylethyl)-thio]-6-[(1'R)-1'-hydr oxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate ##STR282##
A cold (ice-MeOH bath) of allyl (2 R,4 R,5 R,6 S)-4-(3"-azidopropyl)-6-[(1' R)-1'-hydroxyethyl]-3,7-dioxo-1-azabicyclo[3.2.0]heptane-2-carboxylate, freshly prepared from (3 S,4 R)-3-[(1' R)-1'-hydroxyethyl]-4-[(1" R)-1"-(3-azidopropyl)-3"-diazo-3"-allyloxycarbonyl-2"-oxopropyl]azetidin-2 -one (2.00 g, 5.49 mmol) in CH3 CN (50 mL) was treated dropwise with diphenylchlorophosphate (1.3 mL, 6.0 mmol), N,N-diisopropylethylamine (1.1 mL, 6.0 mmol) and a trace of 4-dimethylaminopyridine (10 mg). The mixture was stirred for 1 h and treated with a solution of 2-carbamoylethane thiol (1.16 g, 11.0 mmol) in DMF (5 mL) and N,N-diisopropylethylamine (2.0 mL, 11 mmol). The mixture was stirred for 20 h (cold room). The mixture was treated again with the thiol (580 mg, 5.5 mmol) and N,N-diisopropylethylamine and was stirred for 72 h. It was diluted with ethyl acetate (200 mL), washed with water (2×100 mL), 1M aqueous NaHCO3 (1×100 mL), water (3×100 mL), brine (100 mL) and dried (MgSO4). The residue (2.6 g) was passed through silica gel flash column (75 g, ethyl acetate→acetone) to give the title compound (0.84 g, 36%) as an oil;
IR (CH2 Cl2) νmax : 3680 3600, 3520, 3410 (OH and NH2) 2100 N3, 1775, 1710, 1690 and 1675 cm-1 (C═O);
1 H NMR (CDCl3, 200 MHz) δ: 6.03-5.89 (1H, m vinylicH), 5.7, 5.6 (2H, bd, NH2), 5.22 (2H, m, vinylic-H), 4.9-4.6 (2H, m, allylic-CH2), 4.266 (1H, dd, J=2.6 Hz, J=7.5 Hz, H-5), 3.6-3.27 (3H, m, CH2 N3 and H-4), 3.251 (1H, dd, J=2.7 Hz, J=7.2 Hz, H-6), 3.23-2.95 (2H, m, SCH2), 2.6-2.45 (2H, m, CH2 CON), 2.25 (1H, bs, OH), 1.95-1.5 (4H, m, CH2 --CH2 -4) and 1.373 ppm (3H, d, J=6.2 Hz, CH3).
B. (4R,5S,6S)-4-(3"-Aminopropyl)-3-[(2-carbamoylethyl)thio]-6-[(1'R)-1'-hydro xyethyl]-7-oxo-1-azabicyclo-[3.2.0]hept-2-ene-2-carboxylic acid ##STR283##
A cold (ice bath) solution of allyl (4 R,5 S,6 S)-4-(3"-azidopropyl)-3-[(2-carbamoylethyl)thio]-6-[(1' R)-1'-hydroxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate (0.84 g, 2.0 mmol) in CH2 Cl2 (20 mL) was treated with Pd(PPh3)4 and dropwise with a 0.5M solution of sodium ethyl-2-hexanoate in ethyl acetate (4.2 mL, 2.1 mmol). The mixture was stirred for 45 min, then diluted with ethyl acetate (75 mL) and extracted with ice cold water (1×50 mL and 2×25 mL). The aqueous extracts were combined, washed with diethyl ether and shaken at 5° C. (ice bath) at 45-50 psi hydrogen for 90 min in a Parr hydrogenator using 5% Pdlumina (800 g) as catalyst. The pH of the solution was adjusted to 6.9 with a 1M aqueous KH2 PO4 solution. The catalyst was removed by filtration and the aqueous layer was passed through a μBondapak C18 reversed phase column (160 g, H2 O→4% CH3 CN/H2 O) to give the title compound (340 mg, 48%) as a lyophilized powder;
Purity: 94.7% (304 nm, HPLC);
UV (H2 O) λmax : 302 (ε9260);
IR (Nujol) νmax : 3600-3100 (OH, NH2); 1750-1665 and 1600 cm-1 (C═O);
1 H NMR (D2 O, 200 MHz) δ: 4.35-4.21 (1H, m, H-1'), 4.239 (1H, dd, J=2.6 Hz, J=5.3 Hz, H-5), 3.45-3.36 (1H, m, H-4), 3.385 (1H, dd, J=2.6 Hz, J=6.6 Hz, H-6), 3.2-2.8 (4H, m, CH2 N and SCH2), 2.63-5.55 (2H, m, CH2 CO), 2.0-1.45 (4H, m, (CH2)2 -4) and 1.331 ppm (3H, d, J=6.4 Hz, CH3).
(4R,5S,6S)-4-(4"-N-Formimidoylaminobutyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(1-N -methylimidazol-5-yl)methylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carb oxylic acid ##STR284##
A solution of (4R,5S,6S)-4-(4"-aminobutyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(1-N-methylimida zol-5-yl)methylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid (0.269 g, 0.68 mmol) in water (30 mL) at 0°-5°C was adjusted to pH 8.5 with 1M NaOH. Then benzyl formimidate hydrochloride (0.60 g, 3.49 mmol) was added in small portions while maintaining the pH to 8-8.5 with 1M NaOH. After 30 min, the reaction mixture was quenched by addition of 25 mL of 0.2M pH 6.0 phosphate buffer and washed with ethyl acetate. The aqueous phase was then chromatographed on reversed phase silica gel (3.5×12 cm) using a gradient of acetonitrile (0-8%) in 0.01M pH 7.0 phosphate buffer as eluent. The UV active fractions were combined, concentrated and desalted on the same column by eluting with water and acetonitrile. Lyophilization of the UV active fractions gave 0.180 g (63%) of the title compound as a white amorphous powder: [α]D22 -23.1° (c 1.0, water);
Purity by HPLC: 97.6% on μBondapak C18, 3.9 mm×30 cm, elution 8% CH3 CN--H2 O pH 7.4 phosphate buffer, flow rate 1 mL/min, uv detector 302 nm, retention time 9.45 min;
IR (KBr) νmax : 1750 (C═O of β-lactam), 1715 (C═N of formimidoyl) and 1590 cm-1 (C═O of carboxylate);
1 H NMR (200 MHz, D2 O) δ: 1.30 (d, J=6.34 Hz, 3H, CH3 CHO), 1.3-1.8 (m, 6H, CH2 -1,2 and 3 of butyl), 3.2-3.5 (m, 4H, H-4, H-6 and CH2 N), 3.71 (s, 3H, CH3 -1 of imidazole), 4.08 (ABq, JAB =14.68 Hz, Δν=37.4 Hz, 2H, SCH2), 4.14 (dd overlapping with SCH2, J5,6 =2.43 Hz, JH5,H4 =9.38 Hz, 1H, H-5), 4.24 (m, 1H, CH3 CHO), 6.93 (s, 1H, H-4 of imidazole), 7.62 (s, 1H, H-2 of imidazole) and 7.79 ppm (s, 1H, CH═NH).
(4R,5S,6S)-4-(4"-Guanidinobutyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(pyridin-4-yl )methylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR285##
A solution of (4R,5S,6S)-4-(4"-aminobutyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(pyridin-4-yl)me thylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid (0.134 g, 0.34 mmol) in 15 mL of cold water (pH 6.4), was adjusted to pH 8.0 with 1M NaOH. Then 0.170 g (1.36 mmol) of aminoiminomethanesulfonic acid [K. Kim et al., Tet. Lett., 29, 3183 (1988)] was added in small portions over 5 min while maintaining the pH at 8 with 1M NaOH. Three more portions of aminoiminomethanesulfonic acid (3×0.050 g) were added at 30 min intervals and the resulting mixture (some insoluble material) was stirred for a total of 3 h at 0°-5°C The pH was maintained throughout at 8 with 1M NaOH. Then 15 mL of 0.2M pH 6.0 phosphate buffer was added and the resulting homogeneous solution was chromatographed on reverse phase silica gel (μBondapak C18, 2.5×14 cm). Elution with a gradient of acetonitrile (0-10%) in water gave 0.103 g (69%) of the title compound as a white amorphous powder after freeze drying. This lyophilized material is only slightly soluble in water:
Purity by HPLC: 99% on μ-Bondapak c-18, 3.9 mm×30 cm, elution 10% CH3 CN--H2 O pH 7.4 phosphate buffer, flow rate 1.5 mLin, UV detector 300 nm, retention time 7.47 min;
UV (H2 O, pH 7.4 phosphate buffer) λmax : 262 (5,360) and 304 nm (8,765);
IR (KBr) νmax : 1752 (C═O of β-lactam), 1665 (C═N of guanidine), 1600 cm-1 (C═O of carboxylate);
1 H NMR (200 MHz, D2 O) δ: 1.27 (d, J=6.33 Hz, 3H, CH3 CHO), 1.1-1.7 (m, 6H, CH2 -1,2,3 of butyl), 3.1 (m, 1H, H-4), 3.15 (t, J=6.4 Hz, 2H, CH2 N), 3.26 (dd, JH6,H5 =2.45 Hz, JH6,H1 =6.06 Hz, 1H, H-6), 4.05 (ABq, JAB =14.76 Hz, Δν=22.9 Hz, 2H, SCH2), 4.05 (overlapping with SCH2, 1H, H-5), 4.21 (m, 1H, CH3 CHO), 7.47 (d, J=6.2 Hz, 2H, H-3 of pyridine) and 8.47 ppm (d, J=6.2 Hz, 2H, H-2 of pyridine).
(4R,5S, 6S )-4-(3"-Aminopropyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(1-N-methylimidazol-5-yl )-methylthio ]-7-oxo-1-azabicyclo-[3.2.0]hept2-ene-2-carboxylic acid ##STR286## A. Allyl (4R,5S,6S)-4-(3"-azidopropyl)-6-[(1'R)-1'-ydroxyethyl]-3-[(1-N-methylimida zol-5-yl)methylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate ##STR287##
A solution of allyl (4R,6S)-4-(3"-azidopropyl)-6-[(1'R)-1'-hydroxyethyl]-3,7-dioxo-1-azabicycl o[3.2.0]heptane-2-carboxylate (5 mmol, prepared by cyclization of 1.82 g, 5 mmol of the diazo precursor) in dry CH3 CN (75 mL) was treated at 0°-5°C and under nitrogen with diphenyl chlorophosphate (1.14 mL, 5.5 mmol) and N,N-diisopropylethylamine (0.96 mL, 5.5 mmol). A small crystal of 4-N,N-dimethylaminopyridine was then added and the mixture was stirred for 1 h. A solution of 5-mercaptomethyl-1-N-methyl imidazole (1 g, 7.5 mmol) in dry CH3 CN (1 mL) was added followed by N,N-diisopropylethylamine (1.3 mL, 7.5 mmol). After 3 h, the reaction mixture was diluted with EtOAc (150 mL), washed with water, saturated NaHCO3, brine and dried (MgSO4). After evaporation of the solvent, the residue was chromatographed on silica gel (3.5×6.5 cm) using a gradient of CH3 CN in EtOAc (25:75→100:0) as eluent then acetone. Fractions which contained the desired compound are combined and concentrated under vacuum to give 1.29 g (58%) of the title compound as an oil:
IR (NaCl, film) νmax : 2100 (N3) 1775 (C═O of β-lactam) and 1710 cm-1 (C═O of ester);
1 H NMR (200 MHz, CDCl3) δ: 1.38 (d, J=6.24 Hz, 3H, CH3 CHO), 1.4-2.0 (m, 4H, CH2 -1 and 2 of propyl), 3.23 (dd, JH5,H6 =2.69 Hz, JH3,H4 =7.73 Hz, 1H, H-6), 3.3-3.4 (m, 3H, H-4 and CH2 --N3 overlapping), 3.70 (s, 3H, CH3 -1 of imidazol), 4.05 (ABq, 2H, SCH2), 4.1-4.3 (m, 2H, H-5 and CH3 CHO), 4.75 (m, 2H, CH2 of allyl), 5.2-5.5 and 5.9-6.1 (2×m, 2H and 1H, CH of allyl), 6.94 (s, 1H, H-4 of imidazol), and 7.45 ppm (s, 1H, H-2 of imidazol).
B. (4R,5S,6S)-4-(3"-Aminopropyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(1-N-methylimid azol-5-yl)methylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR288##
A solution of allyl (4R,5S,6S)-4-(3"-azidopropyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(1-N-methylimid azol-5-yl)methylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate (1.25 g, 2.8 mmol) in ethyl acetate (35 mL) was treated at 0°-5°C and under nitrogen with tetrakis(triphenylphosphine)palladium [0] (0.275 g) and sodium 2-ethylhexanoate (0.450 g). The cold bath was removed and the reaction mixture was stirred at 22°C for 1 h. Then the reaction mixture was extracted with water (3×60 mL) and the combined aqueous phase was maintained under vacuum to remove traces of organic solvent. The aqueous solution was then hydrogenated at 0°-5°C over 5% palladium on alumina (1.25 g) under 50 psi of hydrogen for 3 h. The catalyst was filtered, the pH adjusted to 6.2 with 2N HCl. The resulting filtrate was concentrated to about 50 mL and was chromatographed twice on reversed phase silica gel (μBondapak C18, 3.5×14 cm) using a gradient of acetonitrile (0-5%) in water eluent. Lyophilization of pure fractions (checked by reversed phase-TLC) gave 0.39 g (38%) of the title compound as an off-white amorphous powder.
Purity by HPLC: 97.8% on μBondapak C18, 3.9 mm×30 cm, elution with 8% CH3 CN--H2 O pH 7.4 phosphate buffer, flow rate 1 mLin, uv detector 300 nm, retention time 5.00 min;
UV (H2 O) λmax : 300 nm (7396);
IR (KBr) νmax : 1755 (C═O of β-lactam) and 1590 cm-1 (C═O of carboxylate);
1 H NMR (200 MHz, D2 O) δ: 1.31 (d, J=6.36 Hz, 3H, CH2 CHO), 1.3-1.9 (m, 3H, CH2 -1,2 of propyl), 2.99 (t, J=7.15, 2H, CH2 NH2), 3.25 (broad t, 1H, H-4), 3.37 (dd, JH6,H5 =2.66, JH6,H1 =6.46 Hz, 1H, H-6), 3.72 (s, 3H, CH3 -1 of imidazol), 4.08 (ABq, 2H, SCH2), 4.15-4.3 (m overlapping with SCH2, 2H, H-5 and CH3 CHO), 6.96 (s, 1H, H-4 of imidazol and 7.67 ppm (s, 1H, H-2 of imidazol).
(4R,5S,6S)-4-[3"-(N-Formimidoyl)aminopropyl]-6-[(1'R)-1'-hydroxyethyl]-3-[( 1-N-methylimidazol-5-yl)methylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-c arboxylic acid ##STR289##
A solution of (4R,5S,6S)-4-[3"-aminopropyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(1-N-methylimid azol-5-yl)methylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid (300 mg, 0.789 mmol) in water (40 mL) was cooled in an ice bath and the pH of the solution was adjusted to 8 with 1N aqueous NaOH solution. To the mixture was added portionwise benzyl formimidate hydrochloride (5 eq., 3.94 mmol, 0.68 g), the pH being kept at 8-8.5 with 1N aqueous NaOH solution. The reaction mixture was stirred 15 min after the end of addition then the pH was adjusted to 6.5 with 1N aqueous HCl solution and washed with ethyl acetate (2×30 mL). The aqueous phase was concentrated under vacuum without heating and purified on reversed phase silica gel [μBondapak C18, 3×5×13 cm, elution with 0.01M pH 6.0 phosphate buffer and gradient of CH3 CN (0-3%)]. The pure fractions were lyophilized, repurified on the reversed phase column to remove salts (water→5% CH3 CN2 O) to give 0.115 g (36%) of the title compound as a white amorphous solid after lyophilization.
Purity by HPLC: 99.2% on μBondapak C18, 3.9 mm×30 cm, flow rate 1 mL/min, elution 8% CH3 CN--KH2 PO4 0.01M pH 7.4, uv detector 300 nm, retention time 6.30 min;
UV (H2 O) λmax : 300 nm (ε=7853);
IR (KBr) νmax : 1755 (C═O of β-lactam), 1715 (C═N and 1590 cm-1 (C═O of carboxylate;
1 H NMR (200 MHz, D2 O) δ: 1.30(d, J=6.37 Hz, CH3), 1.3-1.72 (4H, m, CH2 CH2), 3.19-3.40 (3H, m, CH2 N and H-6 overlapping), 3.71 (3H, s, N--CH3), 4.08 (ABq, J=14.87 Hz, Δν=45.5 Hz, 2H, SCH2), 4.2 (m, 1H, CH3 CHO), 6.95 (s, 1H, 1H-4 of imidazol), 7.65 (s, 1H, H-2 of imidazol and 7.81 (s, H, CH═NH).
(4R,5S,6S)-4-(4"-N,N-Dimethylaminobutyl)-6-[(1'R)-1'-hydroxy ethyl]-3-[(pyridin-4-yl)methylthio]-7-oxo-1-azabicyclo-[3.2.0]hept-2-ene-2 -carboxylic acid ##STR290##
A solution of (4R,5S,6S)-4-(4"-aminobutyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(pyridin-4-yl)me thylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid (0.176 g, 0.45 mmol) in water (8 mL) was treated at 0°-5°C, with 37% formaldehyde (0.2 mL, ∼2.5 mmol), acetic acid (0.052 mL, 0.9 mmol) and sodium cyanoborohydride (0.056 g, 0.9 mmol). The final mixture has a pH of 4.2. Completion of the reaction was monitored by HPLC. Over 5 h, sodium cyanoborohydride (6×0.050 g) and formaldehyde (2×0.1 mL) were added while maintaining the pH at 4.5-5 with acetic acid. The reaction mixture was then quenched by addition of 15 mL of 0.2M pH 7.0 phosphate buffer and the pH of the solution was adjusted to 6.5 with 1M NaOH. By HPLC, the product is a 74:20 mixture of dimethyl and N-methyl-N-cyanomethyl derivatives. The solution was chromatographed twice on reversed phase silica gel (μBondapak C18, 2.5×18 cm) using a gradient of acetonitrile (0-10%) in water.
Lyophilization of the first fractions gave 0.021 g of the N-methyl-N-cyanomethyl compound.
The following fractions gave 0.104 g (55%) of the title compound as a white amorphous powder: [α]D22 +4.0° (c 0.5, water);
Purity by HPLC: 95% on μBondapak C18, 3.9 mm×30 cm, elution 10% CH3 CN--H2 O, pH 7.4 phosphate buffer, flow rate 1 mLin, retention time 12.0 min;
UV (water, pH 7.4 phosphate buffer) λmax : 262 (6032) and 304 nm (9,937);
IR (KBr) νmax : 1758 (C═O of β-lactam) and 1600 cm-1 (C═O of carboxylate);
1 H NMR (200 MHz, D2 O) δ: 1.1-1.8 (m, 6H, CH2 -1,2 and 3 of butyl), 1.28 (d, J=6.37 Hz, 3H, C H3 CHO), 2.85 (s, 6H, NCH3), 2.9-3.2 (m, 3H, H-4 and CH2 N), 3.27 (dd, JH6,H5 =2.54 Hz, JH6,H1 =6.34 Hz, 1H, H-6), 4.06 (ABq, JAB =14.9 Hz, Δν=23.4 Hz, 2H, SCH2), 4.08 (overlapping with SCH2, 1H, H-5), 4.21 (m, 1H, CH3 C HO), 7.49 (∼d, 2H, H-3 of pyridine) and 8.49 ppm (∼d, 2H, H-2 of pyridine).
(4R,5S,6S)-4-(3"-Aminopropyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(1-methyl-1,2,3- triazol-4-yl)methylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR291## A. Allyl (4R,5S,6S)-4-(3"-azidopropyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(1-methyl-1,2,3 -triazol-4-yl)methylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate ##STR292##
A cold solution (ice-MeOH bath) of allyl (2 R,4 R, 5 R,6 S)-4-(3"-azidopropyl)-6-[(1' R)-1'-hydroxyethyl]-3,7-dioxo-1-azabicyclo[3.2.0]heptan-2-carboxylate, freshly prepared from (3S,4R)-3-[(1' R)-1'-hydroxyethyl]-4-[(1' R)-1"-(3-azidopropyl)-3"-diazo-3"-allyloxycarbonyl-2"-oxopropyl]azetidin-2 -one (1.7 g, 4.7 mmol) in CH3 CN (50 mL) was treated with diphenyl chlorophosphate (1.1 mL, 5 mmol), N,N-diisopropylethylamine (0.92 mL, 5.0 mmol) and a trace of 4-dimethylaminopyridine (5 mg). The mixture was stirred for 1 h and the enol phosphate was treated dropwise with 4-mercaptomethyl-1-methyl-1,2,3-triazole (1.21 g, 9.40 mmol) and N,N-diisopropylethylamine (1.84 mL, 10.0 mmol). After a stirring period of 20 h at 5°C (cold room), the mixture was diluted with ethyl acetate (200 mL), washed with cold 1M aqueous NaHCO3 (2×100 mL), water (2×100 mL), 1M aqueous NaHSO3 (1×100 mL), water (2×100 mL), brine and dried (MgSO4). The residue (3 g) was passed through a silica gel flash pad (150 g, 1 hexane/ethyl acetate→ethyl acetate) to give the title compound (1.0 g, 47%) as an oil;
IR (CH2 Cl2) νmax : 3680, 3600, 3400 (OH), 2100 (N3), 775 and 1710 cm-1 (C═O);
1 H NMR (CDCl3, 200 MHz) δ: 7.489 (1H, s, aromatic-H), 6.02-5.87 (1H, m, vinylic-H), 5.47-5.20 (2H, m, vinylic --H), 4.85-4.59 (2H, m, allylic CH2), 4.274, 4.199, 3.961, 3.886 (2H, ABq, J=15.1 Hz, CH2 -aromatic), 4.25-4.12 (1H, m, H-1'), 4.159 (1H, dd, J=2.6 Hz, J=9.6 Hz, H-5), 4.071 (3H, s, N-Me), 3.64-3.53 (1H, m, H-4), 3.49-3.36 (2H, m, CH2 --N3), 3.228 (1H, dd, J=2.7 Hz, J=7.3 Hz, H-6), 2.3 (1H, bs, OH), 2.03-1.5 (4H, m, (CH2)2 -4) and 1.357 ppm (3H, d, J=6.3 Hz, CH3).
B. (4R,5S,6S)-4-(3"-Aminopropyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(1-methyl-1,2,3 -triazol-4-yl)methylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR293##
A cold (ice bath) solution of allyl (4 R,5 S,6 S)-4-(3"-azidopropyl)-6-[(1' R)-1'-hydroxyethyl]-3-[(1-methyl-1,2,3-triazol-4-yl)methylthio]-7-oxo-1-az abicyclo[3.2.0]hept-2-ene-2-carboxylate (1.0 g, 2.2 mmol) in CH2 Cl2 (50 mL) was treated with Pd(PPh3)4 (100 mg) and dropwise with a 0.5M solution of sodium ethyl-2-hexanoate in ethyl acetate (4.6 mL, 2.3 mmol). The mixture was stirred for 1.5 h, diluted with ethyl acetate (150 mL) and extracted with water (1×75 mL, 2×30 mL). The aqueous extracts were combined, washed with diethyl ether and shaken at 5°C (ice bath) in a Parr hydrogenator at 45-50 psi of hydrogen for 1 h, using 5% Pdlumina as catalyst. More catalyst was then added (1 g) and the mixture was shaken again for 1.5 h more after which the catalyst was removed by filtration. The aqueous portion was passed through a μBondapak C18 reversed phase column (200 g, water→5% CH3 CN/H2 O) to give the title compound (500 mg, 59%) as a lyophilized powder;
Purity: 97.2% (304 nm, HPLC);
UV (H2 O) λmax : 302 (ε8250);
IR (Nujol) νmax : 3600-3100 (OH), 1755 and 1585 cm-1 (C═O);
1 H nmr (D2 O, 200 MHz) δ: 7.866 (1H, s, aromatic H), 4.30-4.18 (1H, m, H-1'), 4.216, 4.143, 4.034, 3.959 (2H, ABq, J=14.7 Hz, CH2 -aromatic), 4.085 (3H, s, N--CH3), 4.10-4.08 (1H, m, hidden H-5), 3.356 (1H, dd, J=2.6 Hz, J=6.5 Hz, H-6), 3.33-3.20 (1H, m, H-4), 3.07-3.00 (2H, m, CH2 N3), 1.95-1.40 (4H, m, (CH2)2 -4) and 1.312 ppm (3H, d J=6.3 Hz, CH3).
(4R,5S,6S)-3-[(2-Acetamidoethyl)thio]-4-(3"-aminopropyl)-6-[(1'R)-1'-hydrox yethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR294##
The title compound was obtained from the residual contamination of 2-carbamoylethyl mercaptan with N-acetyl cysteamine in the reaction carried out in Example 76 and was isolated in the usual manner. The title compound was obtained as a lyophilized powder;
Purity: 95% (304 nm, HPLC);
UV (H2 O) λmax : 302 (ε=7810);
IR (Hnjol) νmax : 3600-3100 OH, NH), 1755, 1650 and 1600 cm-1 (C═O);
1 H nmr (D2 O, 200 MHz) δ: 4.30-4.20 (1H, m, H-1'), 4.230 (1H, dd, J=2.6 Hz, J=9.3 Hz, H-5), 3.5-3.3 (4H, m, H-6, H-4 and CH2 -NAc), 3.1-2.95 (3H, S HCH and CH2 N), 1.9-1.7 (1H, m, SHC H), 1.999 (3H, s, NAc), 1.9-1.5 (4H, m, (CH2)2 -4) and 1.332 ppm (3H, d, J=6.4 Hz, CH3).
(4R,5S,6S)-3-[(2-Carbamoylethyl)thio]-4-[3"-(N-formimidoyl)aminopropyl]-6-[ (1'R)-1'-hydroxyethyl]-7-oxo-1-azabicyclo-[3.2.0]hept-2-ene-2-carboxylic acid ##STR295##
A cold solution (ice bath) of (4 R,5 S,6 S)-4-(3"-aminopropyl)-3-[(2-carbamoylethyl)thio]-6-[(1' R)-1'-hydroxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid (180 mg, 0.500 mmol) in a 0.05M aqueous pH 7.0 aqueous phosphate buffer (50 mL) was treated first with a 0.1N aqueous NaOH solution (to raise and maintain the pH ∼8.2) and then portionwise with benzyl formimidate hydrochloride (0.87 g, 5.0 mmol). The mixture was stirred for 20 min and the pH was lowered to 7.0 with a 1M aqueous NaH2 PO4 solution. The mixture was passed through a μBondapak C18 column (3.6 g, H2 O→4% CH3 CN2 O) to give the title compound (110 mg, 57%) as a lyophilized powder;
Purity: 93.1% (HPLC, 302 mm);
UV (H2 O) λmax : 302 (ε7550);
IR (Nujol) νmax : 3600-3100 (NH2, OH), 1750, 1665 and 1590 cm-1 (C═O);
1 H NMR (D2 O, 200 MHz) δ: 4.34-4.22 (2H, m, H-1' and H-5), 4.225 (part of H-5, d, J=2.6 Hz), 3.49-3.34 (4H, m, CH2 N3, H-5 and H-4), 3.351 (part of H6, d, J=2.4 Hz), 3.15-2.85 (1H, 2 sets of m, SCH2), 2.71-2.51 (2H, m, CH2 CON), 2.0-1.46 (4H, m, (CH22 -4) and 1.322 ppm (3H, d, J=6.4 Hz, CH3).
(4R,5S,6S)-4-(4"-Aminobutyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(1,2,3-thiadiazol -4-yl)methylthio]-7-oxo-1-azabicyclo-[3.2.0]hept-2-ene-2-carboxylic acid ##STR296## A. Allyl (4R,5S,6S)-4-(4"-azidobutyl)-6-[(1H,)-1'-hydroxyethyl]-3-[(1,2,3-thiadiazo l-4-yl)methylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate ##STR297##
A solution of allyl (4R,5R,6S)-4-(4"azidobutyl)-6-[(1'R)-1'-hydroxyethyl]-3,7-dioxo-1-azabicyc lo[3.2.0]heptane-2-carboxylate (5.28 mmol, prepared by cyclization of 2.0 g, 5.28 mmol of diazo precursor), in dry acetonitrile (40 mL) was treated at 0°-5°C and under nitrogen with diphenyl chlorophosphate (1.2 mL, 5.8 mmol) and N,N-diisopropylethylamine (1.0 mL, 5.7 mmol) added simultaneously over 5 min. A small crystal of 4-N,N-dimethylaminopyridine was then added and the mixture was stirred for 1 h. The solution was then cooled to -20°C and treated with N,N-diisopropylethylamine (1.84 mL, 10.56 mmol) followed by 4-mercaptomethyl-1,2,3-thiadiazole (1.45 g, 10.96 mmol) in 5 mL of acetonitrile. The temperature was slowly raised to 0°C over 1 h and the mixture was partitioned between water and ethyl acetate (400 mL). The organic phase was washed with 1M NaHSO3, saturated NaHCO3, brine and dried (MgSO4). Evaporation of the solvent gave an oil which was chromatographed on silica gel (5×11 cm). Elution with a gradient of ethyl acetate in toluene (8:2 to 1:1) gave 1.95 g (79%) of the title compound as an oil:
IR (NaCl, film) νmax : 2100 (N3), 1770 (C═O of β-lactam) and 1708 cm-1 (C═O of ester);
1 H NMR (200 MHz, CDCl3) δ: 1.38 (d, J=6.28 Hz, 3H, CH3 CHO), 1.3-2.0 (m, 6H, CH2 -1,2 and 3 of butyl), 3.18 (dd, JH6,H5 =2.70 Hz, JH6,H1 =7.21 Hz, 1H, H-6), 3.34 (t, J=6.1 Hz, 2H, C H2 N3), 3.46 (broad t, 1H, H-4), 4.17 (dd, JH5,H6 =2.70 Hz, JH5,H4 =9.7 Hz, 1H, H-5), 4.22 (m, 1H, CH3 CHO), 4.50 (ABq, JAB =14.95 Hz, Δν=73.5 Hz, 2H, SCH2), 4.74 (m, 2H, CH2 of allyl), 5.2-5.5 and 5.9-6.1 (2×m, 2H and 1H, CH of allyl), and 8.47 ppm (s, 1H, H-5 of thiadiazole).
B. (4R,5S,6S)-4-(4"-Aminobutyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(1,2,3-thiadiazo l-4-yl)methylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR298##
A solution of allyl (4R,5S,6S)-4-(4"-azidobutyl)-6-[(1'R)1'-hydroxyethyl]-3-[(1,2,3-thiadiazol -4-yl)methylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate (1.95 g, 4.2 mmol) in ethyl acetate (75 mL) was treated at 22°C and under nitrogen with tetrakis(triphenylphosphine)palladium [0] (0.075 g) and 9.2 mL (4.6 mmol) of a 0.5M solution of potassium 2-ethylhexanoate in ethyl acetate. After 45 min, the reaction mixture was extracted with water (2×75 mL) and the combined aqueous extract was maintained under vacuum to remove traces of organic solvent. The aqueous phase was then hydrogenated at 0-5°C over 2.1 g of 5% palladium on alumina and under 45 psi of hydrogen for 2 h. Then 30 mL of 0.2M pH 6.0 phosphate buffer was added and the catalyst was filtered. The filtrate was chromatographed on reversed phase silica gel (μBondapak C18, 3.5×15 cm) using a gradient of acetonitrile (0-8%) in water as eluent.
The first fractions collected gave 0.17 g of (4R,5S,6S)-4-(4"-hydroxybutyl)-6-[(1'R)-1'-hydroxyethyl]-3-(1,2,3-thiadiaz ol-4-yl)methylthio-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate (Na, K salt) as a white solid after freeze drying. The following fractions gave 0.576 g (34%) of the title compound as a white amorphous solid:
Purity by HPLC: 97.7% on μBondapak C18, 3.9 mm×30 cm, elution 8% CH3 CN--H2 O, pH 7.4 phosphate buffer, flow rate 0.8 mLin, retention time 6.75 min;
UV (water, pH 7.4 phosphate buffer) λmax : 260 (5470) and 302 nm (9,209);
IR (KBr) νmax : 1755 (C═O of β-lactam) and 1585 cm-1 (C═O of carboxylate);
1 H NMR (200 MHz, D2 O) δ: 1.29 (d, J=6.36 Hz, 3H, CH3 CHO), 1.3-1.8 (m, 6H, CH2 -1,2 and 3 of butyl), 3.0 (t, J=7.6 Hz, 2H, CH2 NH2), 3.21 (broad t, 1H, H-4), 3.32 (dd, JH6,5 =2.45 Hz, JH6,H1 =6.25 Hz, 1H, H-6), 4.10 (dd, JH5,H6 =2.45 Hz, JH5,H4 =9.42 Hz, 1H, H-5), 4.23 (m, 1H, CH3 CHO), 4.51 (ABq, JAB =14.94 Hz, Δν=40.2 Hz, 2H, SCH2), and 8.89 ppm (s, 1H, H-5 of thiadiazole).
(4R,5S,6S)-4-(4"-N-Formimidoylaminobutyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(1,2 ,3-thiadiazol-4-yl)methylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carbox ylic acid ##STR299##
A solution of (4R,5S,6S)-4-(4"-aminobutyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(1,2,3-thiadiazo l-4-yl)methylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid (0.250 g, 0.63 mmol) in water (30 mL) was treated at 0°-5° C. with benzylformimidate hydrochloride (0.60 g, 3.5 mmol) added in small portions over 10 min while maintaining the pH between 8-8.5 with 1M NaOH. After 20 min, 25 mL of 0.2M pH 6 buffer were added and the mixture was washed with ethyl acetate (20 mL). The aqueous phase was maintained under vacuum to remove traces of organic solvent and chromatographed on reversed phase silica gel (μBondapak C18, 3.5×15 cm). The column was eluted first with a gradient of acetonitrile (0-8%) in a 0.01M pH 7.0 phosphate buffer. The UV active fractions were combined, lyophilized and chromatographed again on the same column using water instead of buffer. Freeze drying of the UV active fractions gave 0.21 g (78%) of the title compound as a white amorphous solid: [α]D22 -28.4° (c 1.0, water);
Purity by HPLC: 98% on μBondapak C18, 3.9 mm×30 cm, elution 8% CH3 CN--H2 O, pH 7.4 phosphate buffer, flow rate 1 mLin, uv detector 302 nm, retention time 7.8 min;
UV (H2 O, pH 7.4 phosphate buffer) λmax : 258 (5,318) and 302 nm (8,795);
IR (KBr) νmax : 1755 (C═O of β-lactam), 1710 (C═N of formimidoyl) and 1590 cm-1 (C═O of carboxylate);
1 H NMR (200 MHz, D2 O) δ: 1.29 (d, J=6.39 Hz, 3H, CH3 CHO), 1.2-1.8 (m, 6H, CH2 -1,2 and 3 of butyl 3.2-3.5 (m, 4H, H-6 and CH2 -4 of butyl overlapping), 4.10 (dd, JH5,H6 =2.47 Hz, JH5,H4 =9.43 Hz, 1H, H-5), 4.23 (m, 1H, CH3 CHO), 4.51 (ABq, JAB =15.0 Hz, Δν=39.4 Hz, 2H, SCH2), 7.8 (broad s, 1H, CH=NH), and 8.9 ppm (s, 1H, H-5 of thiadiazole).
(4R,5S,6S)-4-(4"-Guanidinobutyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(2-hydroxyeth yl)thio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR300##
A solution of (4R,5S,6S)-4-(4"-aminobutyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(2-hydroxyethyl) thio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid (0.150 g, 0.44 mmol) in cold (0°-5°C) water (10 mL) was adjusted to pH 8 with 1M NaOH and then treated with aminoiminomethanesulfonic acid (0.216 g, 1.74 mmol) added in small portions over 5 min. The pH was maintained at 8-8.5 throughout the addition and for another three hours with 1M NaOH. The cold reaction mixture was then quenched by the addition of 10 mL of 0.2M pH 6.0 phosphate buffer and then chromatographed on reversed phase silica gel (μBondapak C18, 2.5×16 cm). Elution with a gradient of acetonitrile (0-5%) in water gave 0.115 g (68%) of the title compound after lyophilization of the UV active fractions:
Purity by HPLC: 99% on μBondapak C18, 3.9 mm×30 cm, elution 5% CH3 CN--H2 O, pH 7.4 phosphate buffer, flow rate 1 mnin, UV detector 300 nm, retention time 7.19 min;
UV (water, pH 7.4 phosphate buffer) λmax : 304 nm (9,530);
IR (KBr) νmax : 1750 (C═O of β-lactam), 1665 (C═N of guanidyl) and 1580 cm-1 (C═O of carboxylate);
1 H NMR (200 MHz, D2 O) δ: 1.32 (d, J=6.35 Hz, 3H, CH3 CHO), 1.3-1.9 (m, 6H, CH2 -1,2 and 3 of butyl), 2.8-3.1 (m, 2H, SCH2), 3.22 (t, J=6.5 Hz, 2H, CH2 NH2), 3.32 (dd, JH6,H5 =2.45 Hz, JH6,H1 =6.19 Hz, 1H, H-6), 3.35 (overlapping with H-6, 1H, H-4), 3.77 (t, J=6.3 Hz, 2H, CH2 OH), 4.21 (dd, JH5,H6 =2.45 Hz, JH5,H4 =9.34 Hz, 1H, H-5), and 4.27 ppm (m, 1H, CH3 CHO).
(4R,5S,6S)-S-[(2-Carbamoyloxyethyl)thio]-4-[3"-(N-formimidoyl)aminopropyl]- 6-[(1'R)-1'-hydroxyethVl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR301##
A cold solution (ice bath) of (4 R,5 S,5 S)-4-(3"-aminopropyl)-3-[(2-carbamoyloxyethyl)thio]-6-[(1' R)-1'-hydroxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid (150 mg, 0.40 mmol) in a 0.04M pH 7.0 aqueous phosphate buffer was treated with a 0.1N aqueous NaOH solution (to adjust and maintain the pH at 8.0-8.3) and portionwise with benzyl formimidate hydrochloride (342 mg, 2.0 mmol). The mixture was stirred for 15 min and the pH was adjusted to 7.05 with a 0.1N aqueous HCl solution. The mixture was passed through a μBondapak C18 reversed phase column (37.5 g, 0.02M aqueous pH 7.0 phosphate buffer→1%→2%→3%→4% CH3 CNhosphate buffer). The lyophilized powder was passed again through the same reversed phase column (H2 O→1%→4% CH3 CN/H2 O) to give pure title compound (95 mg, 59 %) as a lyophilized powder;
Purity: 98.7% (300 nm, HPLC);
UV (H2 O) λmax : 302 (7520);
IR (Nujol) νmax : 3600-3100 (OH, NH2), 1750, 1710 and 1585 cm-1 (C═O);
1 H NMR (D2 O, 200 MHz) δ: 7.830, 7.807 (1H, 2s, CH═N), 4.83-4.20 (4H, m, H-1', H4 and CH2 O); 3.45-3.33 (4H, m, CH2 N, H-6, H-4), 3.19-3.05, 2.98-2.85 (2H, 2 sets of m, S--CH2), 1.95-1.51 (4H, 4-CH2 CH2) and 1.320 ppm (3H, d, J=6.4 Hz, CH3).
(4R,5S,6S)-4-(2"-Aminopropyl)-3-[(2-cyanoethyl)thio]-6-[(1'R)-1'hydroxyethy l]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR302## A. Allyl (4R,5S,6S)-4-(2"-azidopropyl)-3-[(2-cyanoethyl)-hio]-6-[(1'R)-1'-hydroxyet byl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate; isomer B ##STR303##
A cold (5°C) solution of allyl (4R, 5S,6S)-4-(2"-azidopropyl)-3-(diphenylphosphono)-6-[(1'R)-1'-hydroxyethyl]- 7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate (1.48 g, 2.6 mmol) [prepared as in Example 57, Step H] in DMF (15 mL) was treated with 3-mercaptopropionitrile (300 mg, 3.44 mmol) and N,N-diisopropylethylamine (445 mg, 3.44 mmol). The ice-bath was allowed to become exhausted and the reaction mixture stirred at 20°C for a total of 18 h. The solution was diluted with ethyl acetate (100 mL) and washed three times with cold brine. The organic phase was dried (MgSO4) and evaporated to give a mixture which was chromatographed on SiO2 eluting with diethyl ether. Of the two isomeric A and B products produced, the more polar isomer B was purified to give 212 mg (20.1%) of the title compound;
IR (CH2 Cl2) νmax : 3600 (--OH), 2115 (--N3), 1778 (β-lactam), 1710 (--CO2 --)
1 H NMR (CDCl3) δ: 4.6-6.10 (5H, allyl pattern), 4.21-4.32 (2H, m, H-1', 4.28, dd, J; 2.79, 9.60 Hz, H-5), 3.51-3.69 (2H, m, CH--N3, H-4), 3.23 and 3.0 (2H, 2m, S--CH2), 3.06 (1H, dd, J: 2.72, 8.14 Hz, H-6), 2.72 (2H, m, CH2 CN), 1.6-1.9 (2H, m, CH2 C--N3), 1.39 (3H, d, J: 6.2 Hz, --CH3), 1.38 (3H, d, J: 6.38 Hz, --CH3).
B. Sodium (4R,5S,6S)-4-(2"-azidopropyl)-3-[(2-cyanoethyl)thio]-6-[(1'R)-1'-hydroxyet hyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate; isomer B ##STR304##
A cold (5°C) solution of allyl (4R,5S,6S)-4-(2"-azidopropyl)-3-[(2-cyanoethyl)thio]-6-[(1'R)-1'-hydroxyet hyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate (210 mg, 0.52 mmol, the more polar isomer B of Step A) in CH2 C12 (20 mL) was treated with 0.5M sodium ethyl hexanoate (1.14 mL, 0.57 mmol) and (PPh3)4 Pd (60 mg, 0.052 mmol). After stirring for 30 min at 5°C, the solution was diluted with diethyl ether (40 mL) and extracted with 0.04M buffer (pH 7.0, 3×8 mL). The aqueous extracts were combined and chromatographed on reversed phase SiO2 (partisil) eluting with water and then 5% CH3 CN in water. The pertinent fractions were combined and lyophilized to give 63 mg (31.3%) of the title compound;
1 H NMR (D2 O) δ: 4.25-4.35 (2H, m, H-1', H-5), 3.54-3.69 (2H, m, CH--N3, H-4), 3.42 (1H, dd, J: 2.72, 6.38 Hz, H-6), 3.19 and 2.99 (2H, 2m, SCH2), 2.84-2.94 (2H, m, CH2 CN), 1.82 (2H, m, CH2 --CH3), 1.38 (3H, d, J: 6.52 Hz, --CH3), 1.34 (3H, d, J: 6.47 Hz, --CH3).
C. (4R,5S,6S)-4-(2"-Aminopropyl)-3-[(2-cyanoethyl)thio]-6-[(1'R)-1'-hydroxyet hyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid; isomer B ##STR305##
A solution of sodium (4R,5S,6S)-4-(2"-azidopropyl)-3-[(2-cyanoethyl)thio]-6-[(1'R)-1'-hydroxyet hyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate from Step B (63 mg, 0.163 mmol) in 0.05M phosphate buffer (pH 7.0, 20 mL) was hydrogenated at 5°C in the presence of 30% Pd/Celite (270 mg) at a pressure 45 psi of hydrogen. After 60 min, the catalyst was filtered off and the filtrate chromatographed on reversed phase SiO2 (partisil) eluting with water and then 5% CH3 CN in water. The pertinent fractions were combined and lyophilized to give 12 mg (21.7%) of the title compound;
UV (H2 O) λmax : 296 (6200);
IR (Nujol) νmax : 1755 (β-lactam), 1585 cm-1 (--CO2 --);
1 H NMR (D2 O) δ: 4.26-4.40 (2H, m, H-5, H-1'), 3.43-3.69 (3H, m, H-4, CH--N3, H-6), 2.8-3.16 (4H, m, SCH2 CH2 CN), 1.8-2.2 (2H, m, CH2 CH3), 1.43 (3H, d, J: 6.62 Hz, --CH3), 1.35 (3H, d, J: 6.37 Hz, --CH3).
(4R,5S,6S)-3-[(2-Cyanoethyl)thio]-6-[(1'R)-1'-hydroxyethyl]-4-[2"-(imidazol -1-yl)ethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR306## A. Allyl (4R,5S,6S)-6-[(1'R)-1'-tert-butVldimethylsilyloxyethyl]-3-[(2-cyanoethyl)t hio]-4-[2"-(imidazol-1-yl)ethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carb oxylate ##STR307##
A cold solution (dry ice-acetone bath) of allyl (4 R,5 R, 6 S)-6-[(1' R)-1'- tert-butyldimethylsilyloxyethyl]-3-[(2-cyanoethyl)thio]-4-(2"-hydro xyethyl)-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate (370 mg, 0.770 mmol) in CH2 Cl2 (10 mL) was treated with N,N-diisopropylethylamine (462 μl, 2.65 mmol) and dropwise with trifluoromethanesulfonic anhydride (231 μl, 1.37 mmol). The mixture was stirred for 30 min and imidazole (200 mg, 2.94 mmol) was added. The dry ice bath was replaced by an ice-MeOH bath end the mixture was stirred for 3.5 h. The mixture was then diluted with cold ethyl acetate, washed with water (3×20 mL), NaHCO3, (20 mL), water (2×20 mL) brine and dried to give the title compound as a solid (350 mg, 85%);
IR (neat) νmax : 1775 and 1710 cm-1 (C═O);
1 H NMR (CDCl3, 200 MHz) δ: 7.53 (1H, s, aromatic --H), 7.14 (1H, s, aromatic H), 6.99 (1H, s, aromatic H), 5.97-5.88 (1H, m, vinylic-H), 5.48-5.23 (2H, m vinylic-H), 4.80-4.69 (2H, m, allylic-CH2), 4.255 (1H, dd, J=2.5 Hz, J=9.6 Hz, H-5), 4.35-4.2 (2H, m, H-1'and HC H-imidazole), 4.0-3.9 (1H, m HCH-imidazole), 3.173 (1H, dd, J=2.7 Hz, J=9.0 Hz, H-6), 3.2-3.1 (1H, m, H-4), 3.7-3.5 (4H, SCH2 CH2 CN), 2.3-2.15, 2.1-1.9 (2H, 2 sets of m, CH2 -4), 1.369 (3H, d, J=6.1 Hz, CH3), 0.912 (9H, s, tert-butyl), 0.133 and 0.127 ppm (6H, 2s, CH3).
B. Allyl (4R, 5S,6S)-3-[(2-Cyanoethyl)thio]-6-[(1'R)-1'-hydroxyethyl]-4-[2"-(imidazol-1- yl)ethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate ##STR308##
A cold solution (ice-MeOH bath) of allyl (4 R,5 S,6 S)-6-[(1' R)-1'- tert-butyldimethylsilyloxyethyl]-3-[(2-cyanoethyl)thio]-4-[2"-(imidazol-1- yl)ethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate (425 mg, 0.802 mmol) in tetrahydrofuran (20 mL) was treated first with acetic acid (600 μl, 10.5 mmol) and dropwise with a 1M solution of tetrabutylammonium fluoride in tetrahydrofuran (4.5 mL, 4.5 mmol). The mixture was stirred for 30 min and then was allowed to react at 5°C (cold room) for 114 h. After that period, solid NaHCO3 (1 g) was added in, and the mixture was stirred for 30 min (ice bath). It was applied on three preparative TLC (2 mm, acetone, Rf=0.2) to give the title compound (120 mg, 36%), contaminated with some tetrabutylammonium fluoride salt;
IR (neat) νmax : 3600-3100 (OH), 1775 and 1710 cm-1 (C═O);
1 H NMR (CDCl3, 200 MHz) δ: 7.70 (1H, s, aromatic-H), 7.17 (1H, s, aromatic-H), 7.05 (1H, s, aromatic H ), 6.05-5.99 (1H, m, vinylic H), 5.49-5.24 (2H, m, vinylic-H), 4.9-4.6 (2H, m, allylic-CH2), 4.4-4.2 (4H, m, H-5, H-1' and CH2 -imidazole), 3.217 (1H, dd, J=2.9 Hz, J=9.3 Hz, H-6), 3.05-2.90 (1H, m, H-4), 2.75-2.55 (4H, m, SCH2 CH2 CN), 2.50-2.25, 2.05-1.85 (2H, 2 sets of m, CH2 -4), 1.5 (1H, bs, OH) and 1.447 ppm (3H, d, J=5.1 Hz, CH3).
C. (4R,5S,6S)-3-[(2-Cyanoethyl)thio]-6-[(1'R)-1'-hydroxyethyl]-4-[2"-(imidazo l-1-yl)ethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR309##
To a cold (ice bath) solution of allyl (4 R,5 R,6 S)-3-[(2-cyanoethyl)thio]-6-[(1' R)-1'-hydroxyethyl]-4-[-2"-(imidazol-1-yl)ethyl]-7-oxo-1-azabicyclo[3.2.0] hept-2-ene-2-carboxylate (120 mg, 0.288 mmol) in CH2 Cl2 (5 mL) was added Pd(PPh3)4 (20 mg) and a 0.5M solution of sodium ethyl-2-hexanoate (1.0 mL, 0.50 mmol) in ethyl acetate. The mixture was stirred for 30 min and the ice bath was removed. After 30 min the mixture was cooled down again and stirring was continued for 30 more min. The mixture was diluted with diethyl ether (30 mL) and water (5 mL). The phases were separated and the organic layer was extracted again with water (2×5 mL) and 0.05M aqueous pH 7.4 phosphate buffer (3×5 mL). The aqueous extracts were combined, washed with diethyl ether and passed through a reversed phase μBondapak C18 column (20 g, H2 O→2% CH3 CN2 O) to give a material contaminated with the sodium salt of ethyl-2-hexanoate. The powder was passed through the same column but was eluted with 0.025M pH 6.0 phosphate buffer to give pure title compound and the phosphate salt. The salts were removed through the same reversed phase column (H2 O) to give pure title compound (43 mg, 39.6%);
Purity: 99.8% (HPLC 300 nm);
UV (H2 O) λmax : 300 (7800);
IR νmax : 1750 and 1600 cm-1 (C═O);
1 H NMR (D2 O, 200 MHz) δ: 8.00 (1H, s, aromatic H), 7.36 (1H, s, aromatic-H), 7.19 (1H, s, aromatic H), 3.41-3.26 (3H, m, H-5, H-1' and HC H-imidazole), 4.25-4.05 (1H, m, HCH-imidazole), 3.528 (1H, dd, J=2.7 Hz, J=6.8 Hz, H6), 3.25-3.10 (1H, m, H-4), 2.74-2.66 (4H, m, SCH2 CH2 CN), 2.4-2.25, 2.25-2.0 (2H, 2 sets of m, CH2 -4), and 1.383 ppm (3H, d, J=6.4 Hz, CH3).
(4R,5S,6S)-4-(4"-N,N-Dimethylaminobutyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(2-hy droxyethyl)thio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR310##
A solution of (4R,5S,6S)-4-(4"-aminobutyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(2-hydroxyethyl) thio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid (0.175 g, 0.51 mmol) in cold (0°-5°C) water (8 mL) was treated with 0.2 mL of 37% aqueous formaldehyde and acetic acid (52 μL, 0.9 mmol). Then sodium cyanoborohydride was added in small portions (5×0.050 g, total 4.0 mmol) over 1 h (pH∼5). The reaction mixture was then quenched by the addition of 10 mL of 0.2M pH 7.0 phosphate buffer. HPLC of the crude reaction mixture indicated a mixture of title compound and 4-(4"-N-methyl-N-cyanomethylaminobutyl) compound in a 7:3 ratio. The solution was then chromatographed on reversed phase silica gel (μBondapak C18, 2.5×15 cm) using a gradient of acetonitrile (0-5%) in 0.01M pH 7.0 phosphate buffer as eluent. The UV active fractions were combined, concentrated and desalted on the same column using water instead of buffer as eluent. Lyophilization of the pertinent fractions gave 0.077 g (40%) of the title compound as a white amorphous powder: [α]D24 +78.5° (c 1.0, H2 O);
Purity by HPLC: 98% on μBondapak C18, 3.9 mm×30 cm, elution 5% CH3 CN--H2 O pH 7.4 phosphate buffer, flow rate 1 mLin, UV detector 300 nm, retention time 6.68 min;
UV (water, pH 7.4 phosphate buffer) λmax : 304 nm (8,500);
IR (KBr) νmax : 1750 (C═O of β-lactam) and 1590 cm-1 (C═O of carboxylate);
1 H NMR (200 MHz, D2 O) δ: 1.33 (d, J=6.37 Hz, 3H, CH3 CHO), 1.3-2.0 (m, 6H, CH2 -1,2 and 3 of butyl), 2.84 (s, 6H, NCH3), 2.8-3.2 (m 2H, SCH2), 3.11 (t, J=8.0 Hz, 2H, CH2 N), 3.34 (dd, JH6,H5 =2.40 Hz, JH6,H1 =6.41 Hz, 1H, H-6), 3.35 (overlapping with H-6, 1H, H-4), 3.77 (t, J=6.16 Hz, CH2 OH), 4.22 (dd, JH5,H6 =2.40 Hz, JH5,H4 =10.1 Hz, 1H, H-5) and 4.26 ppm (m, 1H, CH3 CHO).
(4R,5S,6S)-4-(4"-Aminobutyl)-6-[(1'R)-1'-hydroxyethyl]-3-methylthio-7-oxo-1 -azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR311## A. Allyl (4R,5S,6S)-4-(4"-azidobutyl)-6-[(1'R)-1'-hydroxyethyl]-3-methylthio-7-oxo- 1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate ##STR312##
A solution of allyl (4R,5R,6S)-4-(4"-azidobutyl)-6-[(1'R)-1'-hydroxyethyl]-3,7-dioxo-1-azabicy clo[3.2.0]heptane-2-carboxylate (5.28 mmol, prepared from 2.0 g, 5.28 mmol of the diazo precursor) in dry acetonitrile (40 mL) was treated at 0°-5°C and under nitrogen with diphenyl chlorophosphate (1.2 mL, 5.79 mmol) and N,N-diisopropylethylamine (1.0 mL, 5.74 mmol) added simultaneously over 5 min. A small crystal of 4-N,N-dimethylaminopyridine was added and the mixture was stirred for 40 min. Then N,N-diisopropylethylamine (0.92 mL, 5.28 mmol) followed by chlorotrimethylsilane (0.67 mL, 5.28 mmol) were added and the mixture was stirred for 5 min. The solution was then treated with N,N-diisopropylethylamine (1.84 mL, 10.56 mmol) and excess methanethiol (0.7 g, 15 mmol) was condensed in the solution. The reaction mixture was then stirred at 0°-5°C for 48 h. After addition of ethyl acetate (400 mL), the organic phase was washed successively with water, 1M NaHSO3, 1M NaHCO3, brine and dried (MgSO4). The solution was then concentrated under reduced pressure, and the residue was diluted with tetrahydrofuran (20 mL) and water (5 mL) and treated at 0°-5°C with acetic acid (2 mL). The resulting mixture was stored at 0°-5°C for 16 h. After dilution with ethyl acetate and work-up as above (sat. NaHCO3, brine, MgSO4), the product obtained was chromatographed on silica gel (5×10 cm). Elution with a gradient of ethyl acetate in toluene (2:8 to 3:7) gave 1.38 g (69%) of the title compound as a clear oil:
IR (NaCl3, film) νmax : 2100 (N3), 1770 (C═O of β-lactam) and 1705 cm-1 (C═O of ester);
1 H NMR (200 MHz, CDCl3) δ: 1.39 (d, J=6.26 Hz, 3H, CH3 CHO), 1.4-1.8 (m, 6H, CH2 -1,2 and 3 of butyl), 1.90 (d, J=5.14 Hz, 1H, OH), 2.36 (s, 3H, SCH3), 3.16 (dd, JH6,H5 =2.58 Hz, JH6,H1 =7.38 Hz, 1H, H-6), 3.20 (overlapping with H-6, 1H, H-4), 3.33 (t, J=6.2 Hz, 2H, CH2 N3), 4.21 (dd, JH5,H6 =2.58 Hz, JH5,H4 =9.29 Hz, 1H, H-5), 4.25 (overlapping with H-5, 1H, CH3 CHO), 4.75 (m, 2H, CH2 of allyl), 5.2-5.5 and 5.9-6.1 ppm (2×m, 2H and 1H, CH of allyl).
B. (4R, 5S, 6S )-4-(4"-Aminobutyl)-6-[(1'R )-1'-hydroxyethyl]-3-methylthio-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carb oxylic acid ##STR313##
A solution of allyl (4R,5S,6S)-4-(4"-azidobutyl)-6-[(1'R)-1'-hydroxyethyl]-3-methylthio-7-oxo- 1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate (1.38 g, 3.63 mmol) in dry ethyl acetate (75 mL) was treated at 22°C and under nitrogen with tetrakis(triphenylphosphine)palladium [0] (0.12 g) and 8 mL (4.0 mmol) of a 0.5M solution of potassium 2-ethylhexanoate in ethyl acetate. After 1.5 h, the reaction mixture was extracted with cold water (2×75 mL) and the combined aqueous extract was maintained under vacuum to remove traces of organic solvent. The aqueous phase was then hydrogenated at 0°-5°C over 2 g of 5% palladium on alumina and under 45 psi of hydrogen for 1.2 h. Then 25 mL of 0.2M pH 6.0 phosphate buffer were added and the catalyst was filtered. The filtrate was chromatographed on reversed phase silica gel (μBondapak C18, 3.5×15 cm) using a gradient of acetonitrile (0-4%) in water as eluent. Lyophilization of the uv active fractions gave 0.57 g (50%) of the title compound as a white amorphous powder: [α]D22 +97.2° (c 1.0, water);
Purity by HPLC: 98.9% on μBondpak C18, 3.9 mm×30 cm, elution 5% CH3 CN--H2 O, pH 7.4 phosphate buffer, flow rate 0.8 mLin, UV detector 300 nm, retention time 6.05 min;
UV (water, pH 7.4 phosphate buffer) λmax : 306 nm (9,475);
IR (KBr) νmax : 1750 (C═O of β-lactam) and 1580 cm-1 (C═O of carboxylate);
1 H NMR (200 MHz, D2 O) δ: 1.33 (d, J=6.34 Hz, 3H, CH3 CHO), 1.3-1.9 (m, 6H, CH2 -1,2 and 3 of butyl), 2.34 (s, 3H, SCH3), 3.01 (t, J=7.6 Hz, 2H, CH2 NH2), 3.31 (dd, JH6,H5 =2.36 Hz, JH6,H1 =6.47 Hz, 1H, H-6), 3.39 (broad t, J=9 Hz, 1H, H-4), 4.19 (dd, JH5,H6 =2.36 Hz, JH5,H4 =9.06 Hz, 1H, H-5) and 4.26 ppm (m, 1H, CH3 CHO).
(4R,5S,6S)-4-(3"-Aminopropyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(1,2,3-thiadiazo l-4-yl)methlthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR314## A. Allyl (4R,5S,6S)-4-(3"-azidopropyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(1,2,3-thiadiaz ol-4-yl)methylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate ##STR315##
A cold solution (ice-MeOH bath) of allyl (2 R,4 R,5 R, 6 S)-4-(3"-azidopropyl)-6-[(1' R)-1'-hydroxyethyl]-3,7-dioxo-1-azabicyclo[3.2.0]heptan-2-carboxylate, freshly prepared from (3 S, 4 R)-3-[(1' R)-1'-hydroxyethyl]-4-[(1" R)-1"-(3-azidopropyl)-3"-diazo-3"-allyloxycarbonyl-2"-oxopropyl]azetidin-2 -one (1.7 g, 4.7 mmol) in CH3 CN (50 mL) was treated dropwise with diphenyl chlorophosphate (1.1 mL, 5.0 mmol) and N,N-diisopropylethylamine (0.92 mL, 5.0 mmol) and with a trace of 4-N,N-dimethylaminopyridine (5 mg). The mixture was stirred for 1 h and the enol phosphate was treated with 4-mercaptomethyl-1,2,3-thiadiazole (925 mg, 7.0 mmol) and N,N-diisopropylethylamine (1.84 mL, 10.0 mmol). The mixture was stirred for 2 h at 5°C (ice bath) and more thiol (0.46 g, 3.5 mmol) and N,N-diisopropylethylamine (0.92 mL, 5 mmol) were added. The reaction mixture was left for 18 h at 5°C (cold room), diluted with ethyl acetate (200 mL), washed with 1M aqueous NaHCO3, (100 mL) water, (100 mL) 1M aqueous NaHSO3 (100 mL), water (100 mL), brine (100 mL) and dried (MgSO4). The residue (4.0 g) was passed through a silica gel flash column (200 g, HexanetOAc 1/1) to give the title compound (0.90 g, 43%) as an oil;
IR (CH2 Cl2) νmax : 3680, 3600 (OH), 2100 (N3), 1775 and 1710 cm-1 (C═O);
1 H NMR (CDCl3, 200 MHz) δ: 8.477 (1H, s, aromatic-H), 6.02-5.85 (1H, m, vinylic-H), 5.48-5.22 (2H, m, vinylic H), 4.87-4.61 (2H, m, allylic --CH2), 4.771, 4.696, 4.337, 4.260 (2H, ABq, J=15.2 Hz, CH2 -aromatic), 4.28-4.14 (1H, m, H-1'), 4.162 (1H, dd, J=2.6 Hz, J=9.6 Hz, H-5), 3.60-3.27 (3H, m, CH2 N3 and H-4), 3.245 (1H, dd, J=2.7 Hz, J=7.5 Hz, H-6), 2.04-1.50 (4H, m, (CH2)2 -4), 1.597 (1H, bs, OH) and 1.377 ppm (3H, d, J=6.3 Hz, CH3).
B. (4R,5S,6S)-4-(3"-Aminopropyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(1,2,3-thiadiaz ol-4-yl)methylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR316##
A cold (ice bath) solution of allyl (4 R,5 S,6 S)-4-(3"-azidopropyl)-6-[(1' R)-1'-hydroxyethyl]-3-[(1,2,3-thiadiazol-4-yl)methylthio]-7-oxo-1-azabicyc lo[3.2.0]hept-2-ene-2-carboxylate (0.9 g, 2 mmol) in CH2 Cl2 (20 mL) was treated with Pd(PPh3)4 (90 mg) followed by the dropwise addition of a 0.5M solution of sodium ethyl-2-hexanoate (4.1 mL, 2.05 mmol) in ethyl acetate. The mixture was stirred for 30 min, then diluted with a 1 mixture of ethyl acetate/diethyl ether and was extracted with a 0.05M pH 7.0 aqueous phosphate buffer solution (1×50 mL and 2×25 mL). The aqueous extracts were combined, washed with diethyl ether and passed through a μBondapak C18 reversed phase column (180 g, H2 O→5% CH3 CN/H2 O) to give the sodium carboxylate (0.50 g, 61%) as a lyophilized powder;
1 H NMR (D2 O, 200 MHz) δ: 8.897 (1H, s, aromatic --H), 4.679, 4.605, 4.447, 4.372 (2H, ABq, J=15 Hz, CH2 -aromatic), 4.299-4.173 (1H, 5 lines, H-1'), 4.124 (1H, dd, J=2.5 Hz, J=9.5 Hz, H-5), 3.412, 3.401 (part of H-6, d, J=2.5 Hz), 3.41-3.34 (3H, m, H-6 and CH2 --N3), 3.31-3.20 (1H m, H-4), 1.9-1.32 (4H, m, (CH2)2 -4) and 1.300 ppm (3H, d, J=6.4 Hz, CH3).
The sodium carboxylate (500 mg, 1.22 mmol) in water (75 mL) was shaken at 0°C (ice bath) in a Parr hydrogenator at 45-50 psi hydrogen for 1 h using 5% Pd/Alumina as catalyst (500 mg). More catalyst (500 mg) was added and the hydrogenation was pursued for one more hour at 0°C The catalyst was removed by filtration and the pH (10-11) was adjusted to 7.0 with a 1M aqueous NaH2 PO4 solution. The mixture was passed through a μBondapak C18 reversed phase column (100 g, H2 O→5% CH3 CN/H2 O) to give the final compound (250 mg, 53%) as a lyophilized powder;
Purity: 99.93% (304 nm, HPLC);
UV (H2 O) λmax : 302 (ε8050);
IR (Nujol) νmax : 3600-3100 (OH, NH2), 1755 and 1685 cm-1 (C═O);
1 H NMR (D2 O, 200 MHz) δ: 8.894 (1H, s, aromatic H), 4.660, 4.586, 4.440, 4.365 (2H, ABq, J=14.9 Hz, CH2 -aromatic), 4.302-4.174 (1H, 5 lines, H-1'), 4.125 (1H, dd, J=2.6 Hz, J=9.5 Hz, H-5), 3.359 (1H, dd, J=2.7 Hz, J=6.5 Hz, H-6), 3.32-3.22 (1H, m, H-4), 3.06-2.97 (2H, m, CH2 --N), 1.83-1.32 (4H, m, (CH2)2 -4) and 1.304 ppm (3H, d, J=6.4 Hz, CH3).
(4R,5S,6S)-4-[3"-(N-Formimidoyl)aminopropyl]-6-[(1'R)-1'-hydroxyethyl]-3-[( 1-methyl-1,2,3-triazol-4-yl)methylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene -2-carboxylic acid ##STR317##
A cold solution (ice bath) of (4 R,5 S,6 S)-4-(3"-aminopropyl)-6-[(1' R)-1'-hydroxyethyl]-3-[(1-methyl-1,2,3-triazol-4-yl)methylthio]-7-oxo-1-az abicyclo[3.2.0]hept-2-ene-2-carboxylic acid (175 mg, 0.460 mmol) in a 0.02M aqueous pH 7.0 phosphate buffer (50 mL) was treated with a 0.10N aqueous NaOH solution (to raise and maintain the pH around 8.0±0.2) and with benzyl formimidate hydrochloride (200 mg, 1.15 mmol). The mixture was stirred for 30 min and then the pH of the solution was lowered to 7.0 with a 1M aqueous NaH2 PO4 solution. The mixture was passed through a μBondapak C18 reversed phase column (20 g, water→5% CH3 CN2 O) to give the title compound (110 mg, 59%) as a lyophilized powder;
Purity: 97.2% (302 nm, HPLC);
UV (H2 O) λmax : 302 (ε9260);
IR (Nujol) νmax : 3600-3700 (OH), 1750 (C═O), 1710 (C═N) and 1585 cm-1 (C═O);
1 H NMR (D2 O, 200 MHz) δ: 7.867 (1H, s, aromatic --H), 7.834, 7.812 (1H, 2s, CH), 4.30-4.18 (1H, m, H-1'), 4.212, 4.137, 4.031, 3.957 (2H, ABq, J=14.9 Hz, CH2 -aromatic), 4.159, 4.112, 4.099 (1H, 1s and 1d, J=2.6 Hz, part of H-5), 4.083 (3H, s, N--CH3), 3.330 (1H, dd, J=2.6 Hz, J=6.1 Hz, H-6), 3.45-3.20 (3H, m, H-4 and CH2 N), 1.9-1.32 (4H, m, (CH2)2 -4) and 1.300 ppm (3H, d, J=6.4 Hz, CH3).
(4R,5S,6S)-4-(3"-Guanidinopropyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(1-methyl-1, 2,3-triazol-4-yl)methylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxyl ic acid ##STR318##
A cold (ice bath) solution of (4 R,5 S,6 S)-4-(3"-aminopropyl)-6-[(1' R)-1'-hydroxyethyl]-3-[(1-methyl-1,2,3-triazol-4-yl)methylthio]-7-oxo-1-az abicyclo[3.2.0]hept-2-ene-2-carboxylic acid (170 mg, 0.460 mmol) in a 0.02M pH 7.0 aqueous phosphate buffer (50 mL) was treated first with a 0.1N aqueous NaOH solution (to raise and maintain the pH at 8.0±0.2) and aminoiminomethanesulfonic acid (570 mg, 4.60 mmol). The mixture was stirred for 90 min and then the pH was lowered to 7.0 with a 1M aqueous solution of NaH2 PO4. The mixture was passed through a μBondapak C18 reversed phase column (20 g, water→5% CH3 CN2 O) to give the title compound (130 mg, 74%) as a lyophilized powder;
Purity: 99.85% (302 nm, HPLC);
UV (H2 O) λmax : 302 (ε9150);
IR (Nujol) νmax : 3600-3100 (NH, OH), 1755 (C═O), 1670-1630 (C═N) and 1590 cm-1 (C═O);
1 H NMR (D2 O, 200 MHz) δ: 7.871 (1H, s, aromatic H), 4.31-4.16 (1H, 5 lines, H-1'), 4.211, 4.135, 4.037, 3.962 (2H, ABq, J=15 Hz, CH2 -aromatic), 4.063 (3H, s, CH3 -triazole), 4.155-4.06 (1H, m, hidden H-5), 3.318, 3.306, 3.267 (part of H-6, d+s), 3.32-3.22 (3H, m, CH2 --N and H-4), 1.9-1.30 (4H, m, (CH2)2 -4) and 1.29 ppm (3H, d, J=6.4 Hz, CH3).
(4R,5S,6S)-4-(4"-Aminobutyl)-3-[(2-carbamoyloxy)ethylthio]-6-[(1'R)-1'-hydr oxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR319## A. Allyl (4R,5S,6S)-4-(4"-azidobutyl)-3-[(2-carbamoyloxy)ethylthio]-6-[(1'R)-1'-hyd roxyethyl)]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate ##STR320##
A solution of allyl (4R,5R,6S)-4-(4"-azidobutyl)-6-[(1'R)-1'-hydroxyethyl]-3,7-dioxo-1-azabicy clo[3.2.0]hept-2-ene-2-carboxylate (7.6 mmol, prepared from 2.88 g, 7.6 mmol of the diazo precursor) in dry acetonitrile (35 mL) was treated at 0°-5°C and under nitrogen with diphenyl chlorophosphate (1.65 mL, 8.0 mmol) and N,N-diisopropylethylamine (1.38 mL, 8.0 mmol) added simultaneously over 5 min. A small crystal of 4-N,N-dimethylaminopyridine was then added and the mixture was stirred for 30 min. Then N,N-diisopropylethylamine (1.38 mL, 8.0 mmol) followed by chlorotrimethylsilane (1.0 mL, 8.0 mmol) were added and the mixture was stirred for 10 min. More N,N-diisopropylethylamine (1.38 mL, 8.0 mmol) followed by 2-carbamoyloxyethanethiol (1.8 g, 15.2 mmol) in acetonitrile were added and the resulting mixture was stirred at 0°-5°C for 18 h. The reaction mixture was then quenched by addition of cold 0.2M pH 7.0 phosphate buffer (100 mL) and ethyl acetate (500 mL). The organic phase was washed with water, brine and dried (MgSO4). Evaporation of the solvent gave an oil which was dissolved in tetrahydrofuran (50 mL) and water (50 mL) and treated at 0°-5°C with acetic acid (1.5 mL). The temperature was then slowly allowed to reach 22°C over 1 h. The reaction mixture was then diluted with ethyl acetate (400 mL) and the work-up was done as above. The residue obtained after evaporation of the solvent was chromatographed twice on silica gel (4×12 cm) using first a mixture of toluene and ethyl acetate (1:1) and then a mixture of dichloromethane and acetonitrile (7:3) as eluent. Evaporation of the UV active fractions gave 1.71 g (49%) of the title compound as an oil:
IR (NaCl, film) νmax : 2,100 (N3), 1770 (C═O of β-lactam) and 1720 (broad C═O of ester and carbamate);
1 H NMR (200 MHz, CDCl3) δ: 1.39 (d, J=6.25 Hz, 3H, CH3 CHO), 1.4-1.8 (m, 6H, CH2 -1,2 and 3 of butyl), 2.8-3.2 (m, 5H, SCH2, CH2 N3 and H-4), 3.18 (dd, JH6,H5 =2.62 Hz, JH6,H1 =7.17 Hz, 1H, H-6), 4.1-4.4 (m, 4H, H-5, CH3 CHO and CH2 OCONH2 overlapping), 4.6-4.9 (m, 4H, CH2 of allyl and OCO NH2), 5.2-5.5 and 5.9-6.1 ppm (2m, 2H and 1H, CH of allyl).
B. (4R, 5S,6S)-4-(4"-Aminobutyl)-3-[(2-carbamoyloxy)ethylthio]-6-[(1'R)-1'-hydroxy ethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR321##
A solution of allyl (4R,5S,6S)-4-(4"-azidobutyl)-3-[(2-carbamoyloxy)ethylthio]-6-[(1'R)-1'-hyd roxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate (1.71 g, 3.77 mmol) in dry ethyl acetate (50 mL) was treated at 22°C and under nitrogen with tetrakis(triphenylphosphine)palladium [0] (0.100 g) followed by 8 mL (4.0 mmol) of a 0.5M solution of potassium 2-ethylhexanoate in ethyl acetate. The reaction mixture was then extracted with water (3×50 mL) and the combined aqueous extract was chromatographed on reversed phase silica gel (μBondapak C18, 3×13 cm). Elution with a gradient of acetonitrile (0-5%) in water gave 1.0 g (59%) of the intermediate potassium salt as a white solid after freeze drying.
The potassium salt was then dissolved in cold water 150 mL and hydrogenated at 0°-5°C over 1.5 g of 5% palladium over alumina and under 45 psi of hydrogen for 1 h. Then 20 mL of 0.2M pH 6.0 phosphate buffer were added, the catalyst was filtered and the filtrate was chromatographed on reversed phase silica gel (μBondapak C18, 3×15 cm). Elution with a gradient of acetonitrile (0-5%) in water gave 0.722 g (83%, 49% combined) of the title compound as a white amorphous powder after lyophilization: [α]D22 +74.6° (c 1.0 H2 O);
Purity by HPLC: 96.4% on μBondapak C18, 3.9 mm×30 cm, elution 5% CH3 CN--H2 O pH 7.4 phosphate buffer, flow rate 0.8 mLin, uv detector 300 nm, retention time 5.56 min;
UV (water, pH 7.4 phosphate buffer) λmax : 302 nm (9,219);
IR (KBr) νmax : 1750 (C═O of β-lactam), 1720 (C═O of carbamate) and 1585 cm-1 (C═O of carboxylate);
1 H NMR (200 MHz, D2 O) δ: 1.33 (d, J=6.34 Hz, 3H, CH3 CHO), 1.3-2.0 (m, 6H, CH2 -1,2 and 3 of butyl), 2.9-3.2 (m, 4H, SCH2 and CH2 NH2), 3.36 (dd, JH6,H5 =2.51 Hz, JH6,H1 =6.27 Hz, 1H, H-6), 3.4 (m, overlapping with H-6, 1H, H-4) and 4.2-4.4 ppm (m, 4H, H-5, CH3 CHO and CH2 OCONH2).
(4R,5S,6S)-4-(3"-Guanidinopropyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(1,2,3-thiad iazol-4-yl)methylthio]-7-oxo-1-azabicyclo[[3.2.0]hept-2-ene-2-carboxylic acid ##STR322##
A cold solution (ice bath) of (4 R,5 R,6 S)-4-(3"-aminopropyl)-6-[(1' R)-1'-hydroxyethyl]-3-[(1,2,3-thiadiazol-4-yl)methylthio]-7-oxo-1-azabicyc lo[3.2.0]hept-2-ene-2-carboxylic acid (120 mg, 0.31 mmol) in a 0.025M pH 7.0 aqueous phosphate buffer (30 mL) was treated first with a 0.1M aqueous NaOH solution (to raise and maintain the pH to 8.1±0.2) and portionwise with aminoiminomethanesulfonic acid (390 mg, 3.10 mmol). The mixture was stirred for 1.5 h and the pH was lowered to 7.0 with a 1M aqueous NaH2 PO4 solution. The mixture was passed through a μBondapak C18 reversed phase column (20 g, water→3% CH3 CN2 O) to give the title compound (90 mg 68%) as a lyophilized powder;
Purity: 98.5% (302 nm, HPLC);
UV (H2 O) λmax : 302 (ε8400);
IR (Nujol) νmax : 3600-3100 (OH, NH3), 1750 (C═O), 1770-1730 (C═N) and 1680 cm-1 (C═O);
1 H NMR (D2 O, 200 MHz) δ: 8.896 (1H, s, aromatic H), 4.654, 4.580, 4.446, 4.371 (2H, ABq, J=15 Hz, CH2 -aromatic), 4.29-4.17 (1H, 5 lines, H-1'), 4.124 (1H, dd, J=2.5 Hz, J=9.5 Hz, H-5), 3.298 (1H, dd, J=2.5 Hz, J=6.5 Hz, H-6), 3.30-3.10 (3H, m, CH2 --N and H-4), 1.90-1.30 (4H, m, (CH2)2 -4) and 1.291 ppm (3H, d, J=6.4 Hz, CH3).
(4R,5S,6S)-3-[(2-Carbamoyloxyethyl)thio]-4-(4"-N-formimidoylaminobutyl)-6-[ (1'R)-1'-hydroxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR323##
A solution of (4R,5S,6S)-4-(4"-aminobutyl)-3-[(2-carbamoyloxyethyl)thio]-6-[(1'R)-1'-hyd roxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid (0.196 g, 0.506 mmol) in cold water (15 mL) was adjusted to pH 8.0 with 1M NaOH and treated at 0°-5°C with benzylformimidate hydrochloride (0.26 g, 1.5 mmol) added in small portions over 10 min. The pH was maintained at 8-8.5 with 1M NaOH throughout the addition. After 20 min, 10 mL of 0.2M pH 6.0 phosphate buffer were added and the reaction mixture was washed with ethyl acetate. The aqueous phase was then chromatographed first on reversed phase silica gel (μBondapak C18, 2.5×15 cm) using a gradient of acetonitrile (0-5%) in 0.02M pH 7.0 phosphate buffer as eluent. The UV active fractions were combined, concentrated (T <5°C) and desalted on the same column using water instead of buffer as eluent. Lyophilization of the pertinent fractions gave 0.136 g (65%) of the title compound as a white amorphous solid: [α]D22 +72.0° (c. 1.0,water);
Purity by HPLC: 98.8% on μBondapak C18, 3.9 mm×30 cm, elution 5% CH3 CN--H2 O, pH 7.4 phosphate buffer, flow rate 1 mL/min, uv detector 300 nm, retention time 6.12 min;
UV (water, pH 7.4 phosphate buffer) λmax : 302 nm (9,228);
IR (KBr) νmax : 1750 (C═O of β-lactam), 1715 cm-1 (C═O of carbamate and formimidoyl) and 1590 cm (C═O of carboxylate);
1 H NMR (200 MHz, D2 O) δ: 1.31 (d, J=6.32 Hz, 3H, CH3 CHO), 1.3-2.0 (m, 6H, CH2 -1,2 and 3 of butyl), 2.8-3.2 (m, 2H, SCH2), 3.3-3.5 (m, 4H, H-4, H-6 and CH2 NH), 4.2-4.4 (m, 3H, CH2 OCONH2, H-5 and CH3 CHO) and 7.79 ppm (broad s, 1H, CHNH).
(4R,5S,6S)-4-(2"-Aminoethyl)-3-[(1-methyl-1,3-imidazol-5-yl)methylthio]-6-[ (1'R)-1'-hydroxyethyl]-7-oxo-1-azabicyclo[[3.2.0]hept-2-ene-2-carboxylic acid ##STR324## A. Allyl (4R,5S,6S)-4-(2"-azidoethyl)-6-[(1'R)-1'-tert-butyldimethylsilyloxyethyl]- 3-[(1-methyl-1,3-imidazol-5-yl)methyl-thio]7-oxo-1-azabicyclo[3.2.0]hept-2- ene-2-carboxylate ##STR325##
A solution of allyl (4R,5R,6S)-4-(2"-azidoethyl)-6-[(1'R)-1'-tert-butyldimethylsilyloxyethyl]- 3,7-dioxo-1-azabicyclo[3.2.0]heptane-2-carboxylate (5.10 mmol, prepared by cyclization of 2.37 g, 5.10 mmol of the diazo precursor) in dry acetonitrile (39 mL) was treated at -15°C and under Argon with diphenyl chlorophosphate (1.10 mL, 5.3 mmol) and N,N-diisopropylethylamine (0.95 mL, 5.3 mmol). A small crystal of 4-N,N-dimethylaminopyridine was added and the mixture was stirred at -15°C for 30 min. N,N-Diisopropylethylamine (0.95 mL, 5.4 mmol) and 1-methyl-5-thiomethyl-1,3-imidazole (1.31 g, 10.2 mmol) were added and the mixture was stirred for 3 h at 0°C The reaction mixture was diluted with EtOAc (272 mL) and washed with water, 1M NaHSO3 saturated NaHCO3, brine and dried (MgSO4). Evaporation of the solvent gave an oil which was chromatographed on silica gel. Elution with a mixture of EtOAc:CH3 CN:acetone (12:87:1) gave 1.5 g (54%) of the title compound as a yellow oil:
IR (CH2 Cl2) λmax : 2100 (N3), 1775 (C═O of β-lactam) and 1710 (C═O of ester).
1 H NMR (200 MHz, CDCl3) δ: 0.09 (s, 6H, SiCH3), 0.90 (s, 9H, Si-t-bu), 1.31 (d, J=6.1 Hz, 3H, CH3 CHO), 1.7 and 2.0 (2×m, 2×1H, CH2 -4), 3.08 (dd, J1'6 =7.17 Hz, J5-6 =2.76 Hz, 1H, H-6), 3.3-3.6 (m, 2H, CH2 N3), 3.69 (s, 3H, CH3 --N), 3.9-4.2 (m, 4H), 4.7 (m, 2H, CH2 of allyl), 5.2-5.5 and 6.0 (2×m, 2H and 1H, CH of allyl), 6.99 and 7.46 (2×S, 2H, imidazoyl).
B. Allyl (4R,5S,6S)-4-(2"-azidoethyl)-3-[(1-methyl-1,3-imidazo-5-yl)methylthio)-6-[ (1'R)-1'-hydroxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate ##STR326##
A solution of allyl (4R,5S,6S)-4-(2"-azidoethyl)-6-[(1'R)-1'-tert-butyldimethylsilyloxyethyl]- 3-[(1-methyl-1,3-imidazol-5-yl)-methylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2 -ene-2-carboxylate (1.50 g, 2.74 mmol) in dry tetrahydrofuran (43 mL) was treated at 0°-5°C and under Argon with acetic acid (0.94 mL, 16.4 mmol) followed by 8.5 mL (8.5 mmol) of 1M solution of tetrabutylammonium fluoride in tetrahydrofuran. The solution was stored at 5°C for 8.5 days. The reaction mixture was then diluted with EtOAc, washed with saturated NaHCO3, brine and dried (MgSO4). Evaporation of the solvent gave an oil which was chromatographed on silica gel (4.5×15 cm). Elution with acetone gave 1.87 g (73%) of the title compound as a foamy light yellow solid:
IR (NaCl, film) νmax : 3200 (broad, OH), 2105 (N3), 1780 (C═O of β-lactam), and 1710 (C═O of ester).
C. (4R,5S,6S)-4-(2"-Aminoethyl)-3-[(1-methyl-1,3-imidazo-5-yl)-methylthio]-6- [(1'R)-1'-hydroxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2ene-2-carboxylate ##STR327##
A solution of allyl (4R,5S,6S)-4-(2"-azidoethyl)-3-[(1-methyl-1,3-imidazol-5-yl)-methylthio]-6 -[(1'R)-1'-hydroxyethyl]7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate (558 mg, 1.29 mmol) in dry CH2 Cl2 (29 mL) was treated at 0°-5°C and under Argon, with tetrakis(triphenylphosphine)palladium [0] (112 mg) and 2.84 mL (1.42 mmol) of a 0.5M solution of sodium 2-ethylhexanoate in EtOAc. Then 39 mL of water was added and the organic layer was separated. The organic phase was reextracted with 2×22 mL of water and the combined aqueous layers were evaporated to remove organic solvent. The residual aqueous phase was hydrogenated over 396 mg of 5% palladium on alumina and under 45 psi of hydrogen for 1 hour. The catalyst was filtered and the filtrate was neutralized with a solution of NaH2 PO4 1M (a few drops). The mixture was chromatographed on reversed phase silica gel (Bondapak C18, 7×11 cm) using a gradient of acetonitrile in water (0-1%) followed by lyophilization of the UV active fractions to give 130 mg of the title compound as a light yellow amorphous powder:
UV (water, pH 7.4 phosphate buffer) λmax : 302 nm (6000);
IR (KBr) νmax : 1765 (C═O of β-lactam) and 1625 (C═O of carboxylate );
1HNMR (200 Hz, D2 O) δ: 1.32 (d, J=6.3 Hz, 3H, C H3 CHO), 1.7 and 2.1 (2×m, 2×1H, CH2 -4), 3.05 (t, J=9.0 Hz, CH2 NH2), 3.23 (m, 1H, H-4), 3.41 (dd, J7'-6 =6.5 Hz, J5-6 =2.7 Hz, H-6), 3.7 (s, 3H, CH3 --N), 3.9-4.3 (m, 4H, CH2 --S, CH3 C HO, H-5), 6.93 and 7.63 (2×s, 2H, imidazoyl).
(4R,5S,6S)-3-[(2-Carbamoylobxyethyl)thio]-4-(4"-guanidinobutyl)-6-[(1'R)-1' -hydroxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR328##
A solution of (4R,5S,6S)-4-(4'-aminobutyl)-3-[(2-carbamoyloxyethyl)thio]-6-[(1'R)-1'-hyd roxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid (0.172 g, 0.44 mmol) in cold water (0°-5°C, 13 mL) was adjusted to pH 8.5 with 1M NaOH. Then aminoiminomethanesulfonic acid (0.275 g, 2.21 mmol) was added in small portions over 10 min while maintaining the pH between 8 and 8.5. After 45 min at 0°-5°C, the reaction mixture was quenched by addition of 15 mL of 0.2M pH 6.0 phosphate buffer and chromatographed on reversed phase silica gel (μBondapak C18, 2.5×15 cm). Elution with a gradient of acetonitrile (0-5%) in water gave 0.149 g (78%) of the title compound as a white amorphous solid after freeze drying:
Purity by HPLC: 99% on μBondapak C18, 3.9 mm×30 cm, elution 10% CH3 CN--H2 O, pH 7.4 phosphate buffer, flow rate 0.8 mLin, uv detector 300 nm, retention time 6.0 min;
UV (water, pH 7.4 phosphate buffer) λmax : 302 nm (9,371);
IR (KBr) νmax : 1750 (sh, C═O of β-lactam), 1730 (broad C═O of carbamate), 1670 (C═O of guanidine) and 1590 cm-1 (C═O of carboxylate);
1 H NMR (200 MHz, D2 O) δ: 1.32 (d, J=6.32 Hz, 3H, CH3 CHO), 1.3-1.9 (m, 6H, CH2 -1,2 and 3 of butyl), 2.8-3.2 (m, 2H, SCH2), 3.22 (t, J=6.5 Hz, CH2 N), 3.34 (dd, JH6,H5 =2.55 Hz, JH6,H1 =6.10 Hz, 1H, H-6), 3.36 (m, overlapping with H-6, 1H, H-4) and 4.2-4.4 ppm (m, 4H, CH2 O, H-5 and CH3 CHO).
(4R,5S,6S)-3-[(2-Cyanoethyl)thio]-4-(2"-dimethylaminoethyl)-6-[(1'R)-1'-hyd roxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR329## A. Allyl (4R,5S,6S)-6-[(1'R)-1'-tert-butyldimethylsilyloxyethyl]-3[(2-cyanoethyl)th io]-4-(2"-dimethylaminoethyl)-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxy late ##STR330##
A cold solution (dry ice-acetone bath) of allyl (4 R,5 S,6 S)-6-[(1' R)-1'- tert-butyldimethylsilyloxyethyl]-3-[(2-cyanoethyl)thio]-4-(2"-hydroxyethyl )-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate (384 mg, 0.801 mmol) in CH2 Cl2 (20 mL) was treated with N,N-diisopropylethylamine (480 μl, 4.20 mmol) and dropwise with trifluoromethanesulfonic anhydride (208 μl, 1.24 mmol). The mixture was stirred for 30 min and a stream of HN(CH3)2 was passed through the mixture for 20 sec. The dry ice-acetone bath was replaced by an ice-MeOH bath. The mixture was stirred for 3 h (reaction followed by TLC), then diluted with ice cold ethyl acetate (100 mL), washed with ice-cold water (4×50 mL), brine and dried (MgSO4) to give title compound (390 mg, 96%) as an oil;
IR (neat) νmax : 2250 (C.tbd.N), 1775 and 1710 cm-1 (C═O);
1 H NMR (CDCl3, 200 MHz) δ: 6.03-4.85 (1H, m, vinylic --H), 5.49-5.22 (2H, m, vinylic H), 4.9-4.6 (2H, m, allylic --CH2), 4.30-4.17 (1H, m, H-1'), 4.205 (1H, dd, J=2.7 Hz, J=9.7 Hz, H-5), 3.40-3.20 (2H, m H-4 and HCH--N), 3.254 (1H, dd, J=2.8 Hz, J=7.0 Hz, H-6), 3.15-2.95 (2H, m, SCH2), 2.72-2.63 (2H, m, CH2 CN), 2.5-2.30 (1H, m, HCH--N), 2.254 (6H, s, N(CH3)2), 2.05-1.80 (1H, m, HCH-4), 1.7-1.4 (1H, m, HCH-4), 1.290 (3H, d, J=6.1 Hz, CH3), 0.890 (9H, s, tert-butyl)and 0.086 ppm (6H, s, dimethyl).
B. Allyl (4R,5S,6S)-3-[(2-cyanoethyl)thio]-4-(2"-dimethylaminoethyl)-6-[(1'R)-1'-hy droxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate ##STR331##
A cold solution (ice-MeOH bath) of allyl (4 R,5 S,6 S)-6-[(1' R)-1'- tert-butyldimethylsilyloxyethyl]-3-[(2-cyanoethyl)thio]-4-(2"-dimethylamin oethyl)-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate (390 mg, 0.768 mmol) in tetrahydrofuran (10 mL) was treated with acetic acid (600 μl, 10.5 mmol) and dropwise with a 1M solution of tetrabutylammonium fluoride in tetrahydrofuran (6.0 mL, 6.0 mmol). The mixture was stirred for 1 h and then was allowed to set in the cold room for 144 h. The mixture was diluted with ethyl acetate (100 mL) and washed with ice cold 1M aqueous NaHCO3 (2×100 mL), cold brine (2×100 mL) and dried (MgSO4) to give the title compound (270 mg, 89%) as a crude oil;
IR (neat) νmax : 3600-3200 (OH), 1775 and 1710 cm-1 (C═O);
1 H NMR (CDCl3, 200 MHz) δ: 6.05-1.90 (1H, m, vinylic H), 5.50-5.24 (2H, m, vinylic-H), 4.9-4.6 (2H, m, allylic-H), 4.294, 4.279 (part of H-5, d, J=2.9 Hz), 4.29-4.15 (1H, m, H-1'), 3.45-3.9 (3H, m, H-4 and SCH2), 3.302 (1H, dd, J=2.9 Hz, J=7.9 Hz, H-6), 2.8-2.6 (4H, m, CH2 --N and CH2 CN), 2.264 (6H, s, N(CH3)2), 2.0-1.6. (3H, m, CH2 -4 and OH) and 1.377 ppm (3H, d, J=6.2 Hz, CH3).
C. (4R,5S,6S)-3-[(2-Cyanoethyl)thio]-4-(2"-dimethylaminoethyl)-6-[(1'R)-1'-hy droxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR332##
A cold solution (ice bath) of crude allyl (4 R,5 S,6 S)-3-[(2-cyanoethyl)thio]-4-(2"-dimethylaminoethyl)-6-[(1' R)-1'-hydroxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate (270 mg, 0.69 mmol) in CH2 Cl2 (5 mL) was treated with Pd(PPh3)4 (30 mg) and a 0.5M solution of sodium ethyl-2-hexanoate in ethyl acetate (1.44 mL, 0.720 mmol). The mixture was stirred for 45 min, then diluted with a 1: ethyl acetate/diethyl ether mixture (20 mL) and extracted with a 0.02M pH 7.0 phosphate buffer (1×20 mL, 2×10 mL). The aqueous extracts were combined, washed with diethyl ether and passed twice through a μBondapak C18 reversed phase column (40 g, 0.02M aqueous pH 7.0 phosphate buffer→3% CH3 CN/H2 O) to give title compound (70 mg, 30%) as a lyophilized powder;
Purity: 99.5% (298 nm, HPLC);
UV (H2 O) λmax : 298 (ε6960);
IR (Nujol) νmax : 3600-31200 (OH), 2250 (C.tbd.N), 1750 and 1590 cm-1 (C═O);
1 H NMR (D2 O, 200 MHz) δ: 4.33-4.21 (1H, m, H-1'), 4.289 (1H, dd, J=2.8 Hz, J=9.3 Hz, H-5), 3.429 (1H, dd, J=2.9 Hz, J=6.6 Hz, H-6), 3.48-3.35 (H, m, H-4), 3.21-2.76 (6H, SCH2, CH2 --N, CH2 CN) 2.758 (6H, s, N(CH3)2), 2.27-2.14 and 1.98-1.80 (2H, 2 sets of m, CH2 -4) and 1.339 ppm (3H, d, J=6.4 Hz, CH3).
(4R,5S,6S)-4-(4"-Guanidinobutyl)-6-[(1'R)-1'-hydroxyethyl]-3-methylthio-7-o xo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR333##
A solution of (4R,5S,6S)-4-(4"-aminobutyl)-6-[(1'R)-1'-hydroxyethyl]-3-methylthio-7-oxo- 1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid (0.226 g, 0.72 mmol) in cold water (0°-5°C, 20 mL) was adjusted to pH 8.5 with NaOH 1M and then treated with aminoiminomethanesulfonic acid (0.40 g, 3.22 mmol) added in small portions over 5 min. The pH was maintained at 8-8.5 throughout the addition and for another two hours with 1M NaOH. The reaction mixture was then quenched by the addition of 20 mL of 0.2M pH 6.0 phosphate buffer and chromatographed on reversed phase silica gel (μBondapak C18, 3.5×15 cm). Elution with a gradient of acetonitrile (0-5%) in water gave 0.169 g (66%) of the title compound as a white amorphous powder after lyophilization:
Purity by HPLC: 99.8% on μBondapak C18, 3.9 mm×30 cm, 5% CH3 CN--H2 O, pH 7.4 phosphate buffer, flow rate 1.5 mL/min, UV detector 304 nm, retention time 5.77 min;
UV (water, pH 7.4 phosphate buffer) λmax : 306 nm (9,411);
IR (KBr) νmax : 1750 (C═O of β-lactam), 1665 (C═N of guanidine) and 1580 cm-1 (C═O of carboxylate);
1 H NMR (200 MHz, D2 O) δ: 1.32 (d, J=6.35 Hz, 3H, CH3 CHO), 1.3-1.9 (m, 6H, CH2 -1,2 and 3 of butyl), 2.34 (s, 3H, SCH3), 3.22 (t, J=6.5 Hz, 2H, CH2 N), 3.28 (dd, JH6,H5 =2.39 Hz, JH6,H1 =6.26 Hz, 1H, H-6), 3.38 (broad t, 1H, H-4), 4.19 (dd, JH5,H6 =2.39 Hz, JH5,H4 =9.04 Hz, 1H, H5) and 4.27 ppm (m, 1H, CH3 CHO).
(4R,5S,5S)-4-(4"-N-Formimidoylaminobutyl)-6-[(1'R)-1'-hydroxyethyl-3-methyl thio-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR334##
A solution of (4R,5S,6S)-4-(4"-aminobutyl)-6-[(1'R)-1'-hydroxyethyl]-3-methylthio-7-oxo- 1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid (0.210 g, 0.67 mmol) in water (30 mL) at 0°-5°C was adjusted to pH 8.5 with 1N NaOH. Then benzyl formimidate hydrochloride (0.60 g, 3.5 mmol) was added in small portions over 10 min while maintaining the pH between 8 and 8.5 with 1N NaOH. After another 20 min at 0°-5°C, the reaction mixture was quenched by addition of 25 mL of 0.2M pH 6.0 phosphate buffer and washed with ethyl acetate (20 mL). The aqueous phase was then maintained under vacuum to remove traces of organic solvent and then chromatographed on reversed phase silica gel (μBondapak C18, 3.5×14 cm) using a gradient of acetonitrile (0-5%) in 0.01M pH 7.0 phosphate buffer as eluent. The UV active fractions were combined, concentrated in vacuo (T <5°C) and chromatographed a second time using water instead of buffer as eluent. Lyophilization of the pertinent fractions gave 0.123 g (54%) of the title compound as a white amorphous powder: [α]22D +110.3° (c 1.0, water);
Purity by HPLC: 99% on μBondapak C18, 3.9 mm×30 cm, elution 3% CH3 CN--H2 O, pH 7.4 phosphate buffer, flow rate 1.5 mLin, uv detector 304 nm, retention time 6.48 min;
UV (water, pH 7.4 phosphate buffer) λmax : 306 nm (10,187);
IR (KBr) νmax : 1750 (C═O of β-lactam) 1715 (C═N of formimidoyl) and 1580 cm-1 (C═O of carboxylate);
1 H NMR (200 MHz, D2 O) δ: 1.32 (d, J=6.27 Hz, 3H, CH3 CHO), 1.3-1.9 (m, 6H, CH2 -1,2 and 3 of butyl), 2.34 (s, 3H, SCH3), 3.3-3.5 (m, 4H, H-6, H-4 and CH2 NH), 4.18 (dd, JH5,H6 =1.92 Hz, JH5,H4 =9.0 Hz, 1H, H-5), 4.26 (m, 1H, CH3 CHO) and 7.8 ppm (broad s, 1H, CH═NH).
(4R,5S,6S)-3-[(2-Carbamoyloxyethyl)thio]-4-(4"-N,N-dimethylaminobutyl)-6-[( 1'R)-1'-hydroxethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR335##
A solution of (4R,5S,6S)-4-(4"-aminobutyl)-3-(2-carbamoyloxyethylthio)-6-[(1'R)-1'-hydro xyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid (0.230 g, 0.59 mmol) in water (10 mL) was treated at 0°-5°C with 0.25 mL (3.0 mmol) of 37% aqueous formaldehyde and 2 mL of 0.2M pH 6.0 phosphate buffer. Then 0.074 g (1.18 mmol) of sodium cyanoborohydride was added all at once and the resulting mixture was stirred at 0°-5°C for 1 h. By HPLC (μBondapak C18) the product was a 51:45 mixture of title dimethyl derivative and of N-methyl-N-cyanomethyl derivative. The crude reaction mixture was chromatographed first on reversed phase silica gel (μBondapak C18, 2×15 cm) using a gradient of acetonitrile (0-5%) in 0.02M pH 7.0 phosphate buffer as eluent. The first fractions were combined and desalted on the same column using water instead of buffer as eluent and gave 0.081 g (33%) of the title compound as a white amorphous solid after lyophilization:
Purity by HPLC: 99% on μBondapak C18, 3.9 mm×30 cm, elution 5% CH3 CN--H2 O, pH 7.4 phosphate buffer, flow rate 1 mLin, uv detector 300 nm, retention time 6.11 min;
UV (H2 O, pH 7.4 phosphate buffer) λmax : 302 (9,036);
IR (KBr) νmax : 1750 (C═O of β-lactam), 1725 (C═O of carbamate) and 1595 cm-1 (C═O of carboxylate);
1 H NMR (200 MHz, D2 O) δ: 1.32 (d, J=6.34 Hz, 3H, CH3 CHO), 1.3-2.0 (m, 6H, CH2 -1,2 and 3 of butyl), 2.84 (s, 6H, NCH3), 2.8-3.2 (m, 2H, SCH2), 3.10 (t overlapping with SCH2, J=7.9 Hz, 2H, CH2 N), 3.36 (dd, JH6,H5 =2.30 Hz, 1H, H-6), 3.37 (m, overlapping with H-6, 1H, H-4), and 4.2-4.4 ppm (m, 4H, H-5, CH3 CHO and CH2 OCONH2 overlapping).
(4R,5S,6S)-4-(2"-Acetaldehydodimethylhydrazone)-3-[(2-cyanoethyl)thio]-6-[( 1'R)-1'-hydroxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR336## A. Allyl (4R,5S,6S)-4-(2"-acetaldehydo)-6-[(1'R)-1'-tert-butyldimethylsilyloxyethyl ]-3-[(2-cyanoethyl)thio]-7-oxo-1-azabicycolo[3.2.0]hept-2-ene-2-carboxylate ##STR337##
A cold (dry ice-acetone bath) solution of oxalyl chloride (150 μL, 1.65 mmol) in CH2 Cl2 (5 mL) was treated dropwise with a solution of DMSO (250 μL, 3.19 mmol) in CH2 Cl2 (1 mL). The mixture was stirred for 5 min and then a solution of allyl (4 R,5 S,6 S)-6-[(1' R)-1'- tert-butyldimethylsilyloxyethyl]-3-[(2-cyanoethyl)thio]-4-(2"-hydroxyethyl )-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate (420 mg, 0.875 mmol) in CH2 Cl2 (4 mL) was added dropwise. The mixture was stirred for 15-20 min and triethylamine (1.5 mL, 10.8 mmol) was added. The solution was stirred for 10 more min and then was allowed to warm to room temperature (∼10 min). It was diluted with water (25 mL) and CH2 Cl2 (40 mL) and the aqueous layer was extracted with CH2 Cl2 (4×20 mL). The organic layers were combined, washed with ice cold 5% aqueous HCl (2×20 mL) ice cold water (2×20 mL), ice cold 5% NaHCO3 (2×20 mL), ice cold water (2×20 mL), brine (20 mL) and dried (MgSO4). Evaporation of the solvent gave the title compound (402 mg, 96%) as an oil;
IR (neat) νmax : 2250 (C.tbd.N), 1775, 1720 and 1710 cm-1 (C═O);
1 H NMR (CDCl3, 200 MHz) δ: 9.849 (1H, s, CHO), 6.01-5.87 (1H, m, vinylic-H), 5.49-5.22 (2H, m, vinylic --H), 4.80-4.60 (2H, m, allylic --CH2), 4.371 (1H, dd, J=2.7 Hz, J=9.8 Hz, H-5), 4.28-4.18 (1H, 6 lines, H-1'), 3.763 (1H, dt, J=3.5 Hz, J=10.2 Hz, H-4), 3.2-2.77 (5H, m, H-6, SCH2 and CH2 CHO), 2.70-2.63 (2H, m, CH2 CN), 1.161 (3H, d, J=6.2 Hz, CH3), 0.883 (9H, s, tert-butyl) and 0.068 ppm (6H, s, dimethyl).
B. Allyl (4R,5S,6S)-4-(2"-acetaldehydedimethylhydrazone)-6-[(1'R)-1'-tert-butyldime thylsilyloxyethyl]-3-[(2-cyanoethyl)thio]-7-oxo-1-azabicyclo[3.2.0]hept-2-e ne-2-carboxylate ##STR338##
A cold (ice bath) solution of allyl (4 R,5 S,6 S)-4-(2"-acetaldehydo)-6-[(1' R)-1'-tert-butyldimethylsilyloxyethyl]-3-[(2 -cyanoethyl)thio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate (402 mg, 0.840 mmol) in anhydrous ethanol (8 mL) was treated with dimethylhydrazine (150 μl, 1.97 mmol). The mixture was allowed to react at 5°C (cold room) for 24 h after which the solvent was evaporated to leave the title compound (463 mg, 100%) as an oil;
IR (neat) νmax : 2250 (C.tbd.N), 1775, 1710 (C═O) and 1550 cm-1 (C.tbd.N);
1 H NMR (CDCl3, 200 MHz), δ: 6.474 (1H, bt, J=4.2 Hz, CH═N), 6.04-5.85 (1H, m, vinylic H), 5.48-5.21 (2H, m, vinylic H), 4.85-4.70 (2H, m, allylic --H), 4.298 (1H, dd, J=2.5 Hz, J=9.4 Hz, H-5), 4.28-4.22 (1H, m, H-1'), 3.64-3.55 (1H, m, H-4), 3.319 (1H, dd, J=2.7 Hz, J=3.9 Hz, H-6), 3.25-2.92 (2H, m, SCH2), 2.754 (6H, s, N(CH3)2), 2.73-2.60 (3H, m, CH2 CN and HC H-4), 2.55-2.3 (1H, m, HCH-4) 1.148 (3H, d, J=6.2 Hz, CH3), 0.0878 (9H, s, tert-butyl) and 0.066, 0.060 ppm (6H, 2s, dimethyl).
C. Allyl (4R,5S,6S)-4-(2"-acetaldehydedimethylhydrazone)-3-[(2-cyanoethyl)thio]-6-[ (1'R)-1'-hydroxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate ##STR339##
A cold solution (ice-MeOH bath) of allyl (4 R,5 S,6 S)-4-(2"-acetaldehydedimethylhydrazone)-6-[(1' R)-1'-tert-butyldimethylsilyloxyethyl]-3-[(2-cyanoethyl)thio]-7-oxo-1-azab icyclo[3.2.0]hept-2-ene-2-carboxylate (460 mg, 0.883 mmol) in tetrahydrofuran (15 mL) was treated with acetic acid (700 μl, 12.2 mmol) and dropwise with a 1M solution of tetrabutylammonium fluoride in tetrahydrofuran (6.0 mL, 6.0 mmol). The mixture was stirred for 30 min and then was allowed to react at 5°C (cold room) for 430 h. It was diluted with ice cold ethyl acetate (100 mL) washed with ice cold 5% aqueous NaHCO3 (4×20 mL), water (2×20 mL) brine (20 mL) and dried (MgSO4). Evaporation of the solvent gave the title compound (335 mg, 93%) as a crude oil;
IR (neat) νmax : 3600-3200 (OH), 2250 (C.tbd.N), 1775, 1710 (C═O) and 1550 cm-1 (C═N);
1 H NMR (CDCl3, 200 MHz) δ: 6.602 (1H, bt, J=4.8 Hz, CH--N), 6.05-5.90 (1H, m, vinylic H), 5.51-5.24 (1H, m, vinylic H), 4.90-4.64 (2H, m, allylic CH2), 4.311 (1H, dd, J=2.9 Hz, J=9.8 Hz, H-5), 4.20-4.00 (1H, m, H-1'), 3.73-3.60 (1H, m, H-4), 3.307 (1H, dd, J=2.9 Hz, J=8.0 Hz, H-6), 3.18-2.90 (2H, m, SCH2), 2.773 (6H, s, N(CH3)2), 2.87-2.63 (3H, m, CH2 CN and HC H-4), 2.56-2.40 (1H, m, HCH-4), 1.59 (1H, bs, OH) and 1.310 ppm (3H, d, J=6.3 Hz, CH3).
D. (4R,5S,6S)-4-(2"-Acetaldehydedimethylhydrazone)-3-[(2-cyanoethyl)thio]-6-[ (1'R)-1'-hyroxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR340##
A cold solution ice bath of allyl (4 R,5 R,6 S)-4-(2"-acetaldehydedimethylhydrazone)-3-[(2-cyanoethyl)thio]-6-[(1' R)-1'-hydroxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate (335 mg, 0.820 mmol) in CH2 Cl2 (5 mL) was treated with Pd(PPh3)4 (35 mg) and dropwise with a 0.5M solution of sodium ethyl-2-hexanoate (1.72 mL, 0.860 mmol) in ethyl acetate. The mixture was stirred for 30 min, then diluted with a 1 solution of ethyl acetate/diethyl ether and extracted with a 0.02M pH 7.0 aqueous phosphate buffer (1×30 mL, 2×10 mL). The aqueous extracts were combined, washed with diethyl ether and passed twice on a μBondapak C18 reversed phase column (40 g, 0.02M aqueous phosphate buffer→5% CH3 CN/buffer and 40 g, H2 O→5% CH3 CN/H2 O) to give the title compound (100 mg, 33%) as a lyophilized powder;
Purity: 97.9% (302 nm, HPLC);
UV (H2 O) νmax : 240 (ε7440) 302 (ε8150);
IR (Nujol) νmax : 3600-3100 (OH), 2250 (C.tbd.N), 1750 and 1590 (C═O) and 1560 cm-1 (C═N);
1 H NMR (D2 O, 200 MHz) δ: 4.425 (1H, dt, J=5.4 Hz, CH═N), 4.288 (1H, dd, J=2.62 Hz, J=9.5 Hz, H-5), 4.30-4.17 (1H, m, H-1'), 3.79-3.67 (1H, , H-4), 3.518 (1H, dd, J=2.6 Hz, J=5.8 Hz, H-6), 3.30-3.13, 3.05-2.90 (2H, 2 sets of m, SCH2), 2.90-2.80 (2H, m, CH2 CN), 2.90-2.50 (2H, m, CH2 -4), 2.691 [6H, s, N(CH3)2 ] and 1.274 ppm (3H, d, J=6.4 Hz, CH3).
Sodium (4R,5S,6S)-4-(2"-acetaldehydo)-3-[(2-cyanoethyl)thio]-6-[(1'R)-1'-hydroxye thyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate acid ##STR341## A. Allyl (4R,5S,6S)-4-(2"-acetaldehydo)-3-[(2-cyanoethyl)thio]-6-[(1'R)-1'-hydroxye thyl]--7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate ##STR342##
A cold solution of (ice-MeOH bath) of allyl (4 R,5 S,6 S)-4-(2"-acetaldehydo)-6-[(1' R)-1'-tert-butyldimethylsilyloxyethyl]-3-[(2-cyanoethyl)thio]-7-oxo-1-azab icyclo[3.2.0]hept-2-ene-2-carboxylate (200 mg, 0.418 mmol) in tetrahydrofuran (8 mL) was treated with glacial acetic acid (350 mL, 6.1 mmol) and dropwise with a 1M solution of tetrabutylammonium fluoride in tetrahydrofuran (3.0 mL, 3.0 mmol). The mixture was stirred for 30 min and then was allowed to react at (cold room) for 500 hours. It was diluted with ice cold ethyl acetate (50 mL) and with ice cold saturated aqueous NaHCO3 (4×20 mL), brine (20 mL) and dried (MgSO4). Evaporation of the solvent left an oil that was applied on a preparative silica gel plate (EtOAc, Rf =0.5) and gave the title compound (40 mg, 26%) as an oil;
IR (neat) νmax : 3600-330 (OH), 2250 (CN), 1775 and 1720 cm-1 (C═O);
1 H NMR (CDCl3, 200 MHz) δ: 9.869 (1H, s, CHO), 6.04-5.87 and 5.49-5.25 (3H, m, vinyl H), 4.89-4.65 (2H, m, CH2 -vinyl), 3.416 (1H, dd, J=2.8 Hz, J=9.9 Hz, H-5), 4.24-4.13 (1H, 5 lines, H-1'), 3.84-3.71 (1H, 6 lines, H-4), 3.19-2.81 (3H, m, H-6, CH2 S and CH2 O), 2.75-2.63 (2H, m, CH2 --CN), 1.57 (1H, bs, OH) and 1.298 ppm (3H, d, J=6.3 Hz, CH3).
B. Sodium (4R,5S,6S)-4-(2"-acetaldehydo)-3-[(2-cyanoethyl)thio]-6-[(1'R)-1'-hydroxye thyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate acid ##STR343##
A cold (ice bath) solution of allyl (4 R,5 S,6 S)-4-(2"-acetaldehydo)-6-[(1' R)-1'-hydroxyethyl]-3-[(2-cyanoethyl)thio]7- oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate (40 mg, 0.11 mmol) in dichloromethane (2 mL) was treated with Pd(PPh3)4 (10 mg) and with N-methylaniline (20 μl, excess). The mixture was stirred for 30 min, then diluted with diethyl ether (20 mL) and extracted with a 0.05M pH 7.4 aqueous phosphate buffer (4×5 mL). The aqueous extracts were combined, washed with diethyl ether and passed through a reversed phase μBondpak C18 column (9 g, H2 O) to give the title compound (10 mg, 26%) as a lyophilized powder;
IR (Nujol) νmax : 3600-3100 (OH), 2250 (CN), 1755, 1720 and 1600 (C═O);
1 H NMR (D2 O, 200 MHz) δ: 9.789 (0.5H, s, CHO), 5.244, 5.226, 5.208, 5.189 (0.5H, 4 lines, C H(OH)2), 4.409 (0.5 H, dd, J=2.7 Hz, J=9.7 Hz, H-5), 4.36-4.20 (1H, m, H-1'), 3.92-3.84 (0.5H, 6 lines, J=3.7 Hz, 10.2 Hz, H-4), 3.556 (0.5 H, dd, J=2.6 Hz, J=5.8 Hz, H-6), 3.56-3.46 (0.5H, m, H-4), 3.27-2.80 (5.5H, m, 0.5 H-6, SCH2, CH2 CN and 1H for CH2 CHO), 2.15-1.90 (1H, m, CH2 CH(OH)2), 1.336 (1.5H, d, J=6.4 Hz, CH3) and 1.248 ppm (1.5H, d, J=6.5 Hz, CH3).
Sodium (4R,5S,6S)-3-[(2-cyanoethyl)thio]-6-[(1'R)-1'-hydroxyethyl]-4-(sodium oxyc arbonylmethyl)-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate ##STR344## A. Allyl (4R,5S,6S)-4-(allyloxycarbonylmethyl)-3-[(2-cyanoethyl)thio]-6-[(1'R)-1'-t ert-butyldimethylsilyloxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carbo xylate ##STR345##
A cold (ice bath) solution of allyl (4 R,5 S,6 S)-4-(2"-acetaldehydo)-6-[(1' R)-1'- tert-butyldimethylsilyloxyethyl]-3-[(2-cyanoethyl)thio]-7-oxo-1-azabicyclo [3.2.0]hept-2-ene-2-carboxylate (300 mg, 0.627 mmol) in dimethylformamide (10 mL) was treated with pyridinium dichromate (2.0 g, 5.7 mmol) and was stirred for 24 h at 5°C (cold room). The mixture was diluted with water (100 mL) and the aqueous fraction was extracted with ethyl acetate (5×20 mL). The ethyl acetate extracts were combined, washed with water (2×50 mL), 1% ice cold HCl (50 mL), water (3×50 mL), brine and dried (MgSO4). Evaporation of the solvent left a residue (200 mg) that was dissolved in a 1:1 mixture of dichloromethane and DMF (10 mL). The solution was treated successively with allyl alcohol (1 mL), 1-hydroxybenzotriazole (135 mg, 1.00 mmol) and 1,3-dicyclohexyl carbodiimide (206 mg, 1.00 mmol) and was stirred for 72 h at about 22°C The ethyl acetate extracts were combined, washed with water (3×20 mL), ice cold 1N aqueous HCl (20 mL), water (2×20 mL), 1M aqueous NaHCO3 (20 mL), water (3×20 mL), brine (20 mL) and dried (MgSO4). The residue upon solvent evaporation was applied on two preparative silica gel plates (2 mm, EtOAc, Rf =0.9) to give the title compound (100 mg, 29.8%) as an oil;
IR (neat) νmax : 2250 (C.tbd.N), 1780, 1735 and 1710 cm-1 (C═O);
1 H NMR (CDCl3, 200 MH) δ: 6.03-5.81, 5.48-5.22 (6H, m, vinylic H), 4.82-4.58 (4H, 2 sets of m, CH2 -vinyl), 3.370 (1H, dd, J=2.7 Hz, J=9.6 Hz, H-5), 4.30-4.19 (1H, 6 lines, H-1'), 3.7 (1H, X part of ABX, J=3.4 Hz, H-4), 3.24-3.11, 3.04-2.90 (2H, 2 sets of m, SCH2), 3.128 (1H, dd, J=2.7 Hz, J=4.2 Hz, H-6), 2.877, 2.860, 2.792, 2.774 (1H, AB part of ABx, J=3.4 Hz, J=17.1 Hz), 2.601, 2.545, 2.516, 2.460 (1H, AB part of ABX, J=17.1 Hz, J=11.3 Hz, CH2 -4), 2.72-2.63 (2H, m, CH2 CN), 1.147 (3H, d, J=6.3 Hz, CH3), 0.879 (9H, s, tert-butyl), 0.068 and 0.063 ppm (6H, 2 s, dimethyl).
B. Allyl (4R,5S,6S)-4-(allyloxycarbonylmethyl)-3-[(2-cyanoethyl)thio]-6-[(1'R)-1'-h ydroxyethyl]-7-oxo-1-azabicyclo]3.2.0]hept-2-ene-2-carboxylic acid ##STR346##
A cold (ice-methanol bath) of allyl (4 R,5 S,6 S)-4-(allyloxycarbonylmethyl)-3-[(2-cyanoethyl)thio]-6-[(1' R)-1'- tert-butyldimethylsilyloxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-car boxylate (100 mg, 0.187 mmol) in THF (3 mL) was treated with glacial acetic acid (120 μl, 2.09 mmol) and dropwise with a 1M solution of tetrabutylammonium fluoride in THF (1.3 mL, 1.3 mmol). The mixture was stirred for 30 minutes and then it was allowed to react at 5°C (cold room) for 430 hours. The mixture was diluted with ice cold ethyl acetate (40 mL), washed with ice cold saturated aqueous NaHCO3 (4×20 mL), water (2×20 mL), brine (20 mL) and dried (MgSO4). Evaporation of the solvent left a residue that was applied on a preparative silica gel plate (2 mm, EtOAc, Rf =0.75) to give the title compound (23 mg, 29%) as an oil that solidified upon standing;
IR (neat) νmax : 3600-3300 (OH), 2250 (C.tbd.N), 1775, 1730 and 1710 cm-1 (C═O);
1 H NMR (CDCl3, 200 MHz) δ: 6.04-5.83, 5.50-5.24 (6H, 2 sets of m, vinylic-H), 4.89-4.61 (4H, 2 sets of m, CH2 -vinyl), 4,395 (1H, dd, J=3.0 Hz, J=9.8 Hz, H-5), 4.30-4.10 (1H, m, H-1'), 3,803-3,678 (1H, X part of ABX, J=3.4 Hz, H-4), 3.173 (1H, dd, J=3.1 Hz, J=6.9 Hz, H-6), 3.20-3.133, 3.09-2.9 (2.5 H, 2 sets of m, SCH2 and hidden d of ABq), 2.884, 2.867 (1 part of AB, J=3.4 Hz, CH2 -4), 2.688 (2H, t, J=7.2 Hz, CH2 CN), 2.649, 2.589, 2.562, 2.503 (1H, AB part of ABX, J=11.9 Hz, J=17.5 Hz, CH2 -4), 1.974 (1H, d, J=4.6 Hz, OH) and 1.300 ppm (3H, d, J=6.3 Hz, CH3).
C. Sodium (4R,5S,6S)-3-[(2-cyanoethyl)thio]-6-[(1'R)-1'-hydroxyethyl]-4-(sodium oxycarbonylmethyl)-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate ##STR347##
A cold (ice bath) solution of allyl (4 R,5 S,6 S)-4-(allyloxycarbonylmethyl)-3-[(2-cyanoethyl)thio]-6-[(1'R)-1'-hydroxyet hyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate (23 mg, 0.055 mmol) in CH2 Cl2 (3 mL) was treated successively with Pd(PPh3)4, (11 mg) and N-methylaniline (30 μl, 0.22 mmol). The mixture was stirred for 20 min, then was diluted with diethyl ether (10 mL) and extracted with a 0.1M pH 7.0 aqueous phosphate buffer (5×2 mL). The aqueous extracts were combined, washed with diethyl ether and passed through a reversed phase μBondapak C18 column (5 g, H2 O→1% CH3 CN) to give the title compound (10 mg, 50%) as a lyophilized powder;
IR (nujol) νmax : 3600-3200 (OH), 2250 (C.tbd.N), 1755 and 1600 cm-1 (C═O);
1 H NMR (D2 O, 200 MHz) δ: 4.328 (1H, dd, J=2.8 Hz, J=9.5 Hz, H-5), 4.297-4.22 (1H, m, H-1'), 3.778-3.653 (1H, x part of ABX, J=3.7 Hz, H-4), 3.419) 1H, dd, J=2.8 Hz, J=4.2 Hz, H-6). 3.30-3.15, 3.01-2.90 (2H, 2 sets of m, SCH2), 2.90-2.81 (≈2.5H, m, SCH2 CN and 1 d of the B part of ABX), 2.760-2.742 (0.77H, d, J=3.7 Hz, B part of ABX, C H2 CO2), 2.346, 2.286, 2.262 and 2.203 (1H, A part of ABX, J=11.8 Hz, J=16.7 Hz, CH2 CO2) and 1.241 ppm (3H, d, J=6.4 Hz, CH3).
(4R,5S,6S)-3-{(4S)-4-[(2S)-2-Dimethylaminocarbonyl]pyrrolidinylthio}-6-[(1' R)-1'-hydroxyethyl]-4-(2"-hydroxyethyl)-7-oxo-1-azabicyclo[3.2.0]hept-2-ene -2-carboxylic acid ##STR348## A. Allyl (4R,5R,6S)-3-diphenylphosphoryloxy-6-[(1'R)-1'-tert-butyldimethylsilyloxye thyl]-4-(2"-tert-butyldimethylsilyloxyethyl)-7-oxo-1-azabicyclo[3.2.0]hept- 2-ene-2-carboxylate ##STR349##
A solution of (3S,4R)-3-[(1'R)-1'-tert-butyldimethylsilyloxyethyl]-4-[(1R)-1-(2-tert-but yldimethylsilyloxyethyl)-3-allyloxycarbonyl-3-diazo-2-oxopropyl]azetidin-2- one (6.93 g, 12.5 mmol) in dry benzene (150 mL) was treated with rhodium (II) octanoate dimer (0.2 g) and heated under reflux (bath temperature 90°-95°C) for 1 h. The solvent was evaporated under reduced pressure and the residue was dissolved in acetonitrile (80 mL) and cooled to 0°-5°C Then N,N-diisopropylethylamine (2.40 mL, 13.78 mmol) and diphenyl chlorophosphate (2.85 mL, 13.75 mmol) were added simultaneously over 5 min. A small crystal of 4-N,N-dimethylaminopyridine was then added and the mixture was stirred for 1 h. The reaction mixture was then diluted with ethyl acetate (500 mL) and washed successively with cold water, 0.2M pH 7.0 phosphate buffer, brine and dried (MgSO4). Evaporation of the solvent under vacuum gave an oil which was chromatographed on silica gel (5×12 cm). Elution with a mixture of toluene and ethyl acetate (95:5) gave 5.77 g, (61%) of the title compound as a clear oil:
IR (NaCl, film) νmax : 1788 (C═O of β-lactam) and 1730 cm-1 (C═O of ester);
1 H NMR (200 MHz, CDCl3) δ: -0.01, 0.06 and 0.07 (3×s, 6H, 3H and 3H, SiCH3), 0.83 and 0.87 (2×s, 2×9H, Sitert-Bu), 1.27 (d, J=6.14 Hz, 3H, CH3 CHO), 1.5-1.8 and 1.9-2.1 (m, 2H, CH2 -4), 3.25 (dd, JH6,H5 =2.77 Hz, JH6,H1 =6.92 Hz, 1H, H-6), 3.3-3.7 (m, 3H, H-4 and CH2 CH2 OSi), 4.12 (dd, JH5,H6 =2.77 Hz, JH5,H4 =10.35 Hz, 1H, H-5), 4.20 (m, 1H, CH3 CHO), 4.64 (broad d, J=5.1 Hz, 2H, CH2 of allyl), 5.1-5.4 and 5.7-6.0 (2×m, 2H and 1H, CH of allyl) and 7.1-7.4 ppm (m, 10H, aromatics).
B. Allyl (4R,5S,6S)-3-((4S)-4-[1-N-allyloxycarbonyl-(2S)-2-dimethylaminocarbonyl]py rrolidinylthio)-6-[(1'R)-1'-tert-butyldimethylsilyloxyethyl]-4-(2"-tert-but yldimethylsilyloxyethyl)-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate ##STR350##
A solution of allyl (4R,5S,6S)-3-diphenylphosphoryloxy-6-[(1'R)-1'-tert-butyldimethylsilyloxye thyl]-4-(2"-tert-butyldimethylsilyloxyethyl)-7-oxo-1-azabicyclo[3.2.0]hept- 2-ene-2-carboxylate (1.24 g, 1.63 mmol) in dry acetonitrile (20 mL) was cooled to 0°-5°C and treated successively with N,N,diisopropylethylamine (0.57 mL, 3.27 mmol) and (2S,4S) 1-N-allyloxycarbonyl-2-dimethylaminocarbonyl-4-mercaptopyrrolidine (0.84 g, 3.27 mmol) [prepared by the general procedures described in European Patent Application EP-126,587] in acetonitrile (3 mL). The reaction mixture was then stirred at 0°-5°C for 16 h. The solution was then diluted with ethyl acetate (200 mL), washed with water, 0.2M phosphate buffer pH 7.0, brine and dried (MgSO4). Evaporation of the solvent in vacuo gave an oil which was chromatographed on silica gel (2.5×20 cm). Elution with a mixture of toluene and ethyl acetate (1:1) gave 0.80 g (64%) of the title compound as an oil:
IR (NaCl, film) νmax : 1775 (C═O of β-lactam), 1710 (C═O of ester) and 1660 cm-1 (C═O of amide);
1 H NMR (200 MHz, CDCl3) δ: 0.03, 0.05 and 0.09 (3×s, 3H, 3H and 6H, SiCH3), 0.87 and 0.89 (2×s, 2×9H, Sit-But), 1.26 (d, J=6.25 Hz, 3H, CH3 CHO), 1.6-2.1 (m, 3H, CH2 -4 and H-3 of pyrrolidine), 2.6 (m, 1H, H-3 of pyrrolidine), 2.95, 1.97, 3.03 and 3.08 (4 s, total 6H, CON(CH3)2, 3.05 (overlapping with NCH3, 1H, H-6), 3.4-3.6 and 3.7-3.9 (2×m, 3H and 2H, H-4, CH2 OSi and H-5 of pyrrolidine), 4.0-4.2 (m, 1H, H-4 of pyrrolidine), 4.2-4.4 (m, 2H, H-5 and CH3 CHO), 4.5-4.9 (m, 5H, CH2 of allyl and H-2 of pyrrolidine), 5.1-5.5 and 5.8-6.1 ppm (2×m, 4H and 2H, CH of allyl).
C. Allyl (4R,5S,6S)-3-((4S)-4-[1-N-allyloxycarbonyl-(2S)-2-dimethylaminocarbonyl]py rrolidinylthio)-6-[(1'R)-1'-hydroxyethyl]-4-(2"-hydroxyethyl)-7-oxo-1-azabi cyclo[3.2.0]hept-2-ene-2-carboxylate ##STR351##
A solution of allyl (4R,5S,6S)-3-((4S)-4-[1-N-allyloxycarbonyl-(2S)-2-dimethylaminocarbonyl]py rrolidinylthio)-6-[(1'R)-1'-tert-butyldimethylsilyloxyethyl]-4-(2"-tert-but yldimethylsilyloxyethyl)-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate (0.70 g, 0.91 mmol) in dry tetrahydrofuran (10 mL) was treated dropwise at 0°-5°C with acetic acid (0.62 mL, 11.0 mmol) followed by 5.5 mL (5.5 mmol) of a 1M solution of tetrabutylammonium fluoride in tetrahydrofuran. The reaction mixture was then stored at 10°C for 144 h. The solution was then diluted with ethyl acetate (200 mL) washed with cold saturated sodium bicarbonate, brine and dried (MgSO4). Evaporation of the solvent in vacuo gave an oil which was chromatographed on silica gel (2.5×12 cm). Elution with ethyl acetate first gave 0.30 g (50%) of mono deprotected allyl (4R,5S,6S)-3-((4S)-4-[1-N-allyloxycarbonyl-(2S)-2-dimethylaminocarbonyl]py rrolidinylthio)-6-[(1'R)-1'-tert-butyldimethylsilyloxyethyl]-4-(2"-hydroxye thyl)-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate [see Example 109, Method B, Step A].
Elution with a mixture of ethyl acetate, acetone and acetonitrile (6:2:2) then gave 0.179 g (36%) of the title carbapenem as an oil contaminated by some tetrabutylammonium salt. This product was used as such for the next step:
IR (NaCl, film) νmax : 3400 (OH), 1775 (C═O of B-lactam), 1710 (C═O of ester) and 1650 cm-1 (C═O of amide);
1 H NMR (200 MHz, CDCl3) δ: 1.33 (d, J=6.33, Hz, 3H, CH3 CHO), 1.6-2.0 (m, 3H, CH2 -4 and H-3 of pyrrolidine), 2.9 (m, 1H, H-3 of pyrrolidine), 2.95, 2.97, 3.03 and 3.09 (4×s, total 6H, NCH3), 3.4∼5.0 (broad, 16H), 5.2-5.5 and 6.8-6.1 ppm (4H and 2H, CH of allyl).
D. (4R,5S,6S)-3-((4S)-4-[(2S)-2-Dimethylaminocarbonyl]pyrrolidinylthio)-6-[(1 'R)-1'-hydroxyethyl]-4-(2"-hydroxyethyl)-7-oxo-1-azabicyclo[3.2.0]hept-2-en e-2-carboxylic acid ##STR352##
A solution of allyl (4R,5S,6S) 3-((4S)-4-[1-N-allyloxycarbonyl-(2S)-2-dimethylaminocarbonyl]pyrrolidinylt hto)-6-[(1'R)-1'-hydroxyethyl]-4-(2"-hydroxyethyl)-7-oxo-1-azablcyclo[3.2.0 ]hept-2-ene-2-carboxylate (0.33 g, 0.613 mmol) in dichloromethane (10 mL) was treated at 22°C and under nitrogen with tetrakis(triphenylphosphine)palladium [0] (0.030 g) and N-methylaniline (0.26 mL, 2.45 mmol). After 1 h, the solid formed was collected by filtration and dried under vacuum to give 0.164 g (65%) of the crude title compound as a powder. This solid was chromatographed on reversed phase silica gel (μ-Bondapak c-18, 2.5×14 cm) using a gradient of acetonitrile (0-5%) in water as eluent. Lyophilization of the UV active fractions gave 0.122 g (44%) of the title compound as a white amorphous powder: [α]D22 =-58.5° (c 1.0, H2 O);
Purity by HPLC: 94.7% on μ-Bondapak c-18, 3.9 mm×30 cm, elution 5% CH3 CN--H2 O, pH 7.4 phosphate buffer, flow rate 1 mLin, UV detector 300 nm, retention time 5.9 min;
UV (H2 O, pH 7.4 phosphate buffer) λmax : 302 nm (8,680);
IR (KBr) νmax : 1750 (CO of β-lactam), 1650, 1660 (C═O of amide) and 1600 cm-1 (C═O of carboxylate);
1 H NMR (200 MHz, D2 O) δ: 1.32 (d, J=6.37 Hz, 3H, CH3 CHO), 1.7-2.2 (m, 3H, CH2 -1 of hydroxyethyl and H-3 of pyrrolidine), 3.0 (m overlapping with NCH3, 1H, H-3 of pyrrolidine), 3.0 and 3.07 (2×s, 2×3H, NCH3), 3.3-3.9 (m, 5H, H-4, CH2 CH2 OH and CH2 -5 of pyrrolidine), 3.48 (dd, JH6,H5 =2.73 Hz, JH6,H1 =5.91 Hz, 1H, H-6), 3.95 (m, 1H, H-4 of pyrrolidine), 4.2-4.4 (m, 2H, H-5 and CH3 CHO overlapping), and 4.83 ppm (t, J=5.8 Hz, 1H, H-2 of pyrrolidine).
(4R,5S,6S)-4-(2"-Azidoethyl)-3-((4S)-4-[(2S)-2-dimethylaminocarbonyl]pyrrol idinylthio)-6-[(1'R)-1'-hydroxyethyl]-7-oxo-1-azabtcyclo[3.2.0]hept-2-ene-2 -carboxylic acid ##STR353## Method A A. Allyl (4R,5R,6S)-4-(2"-azidoethyl)-3-diphenylphosphoryloxy-6-[(1'R)-1'-tert-buty ldimethylsilyloxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate ##STR354##
A solution of (3S,4S)-4-[(1R)-1-(2-azidoethyl)-3-allyloxycarbonyl-3-diazo-2-oxopropyl]-3 -[(1'R)-1'-tert-butyldimethylsilyloxyethyl]azetidin-2-one (4.0 g, 8.6 mmol) in dry benzene (125 mL) was treated under nitrogen with Rhodium(II)octanoate dimer (0.075 g) and then heated under reflux (bath temperature 90°C) for 30 min. The solvent was then evaporated under reduced pressure and the intermediate bicyclic ketone was dissolved in dry acetonitrile (60 mL) and cooled to 0°-5°C The solution was then treated with diphenyl chlorophosphate (2.0 mL, 9.65 mmol) and N,N-diisopropylethylamine (1.68 mL, 9.64 mmol) added simultaneously over 5 min. Then a small crystal of 4-N,N-dimethylaminopyridine was then added and the mixture was stirred at 0°-5°C for 45 min. The reaction mixture was then diluted with ethyl acetate (500 mL), washed with cold water, 0.2M pH 7.0 phosphate buffer, brine and dried (MgSO4). After evaporation of the solvent under reduced pressure, the residue was chromatographed on silica gel (5×10 cm). Elution with a gradient of ethyl acetate (0-5%) in toluene gave 3.84 g (66%) of the title compound as an oil:
IR (NaCl, film) νmax : 2100 (N3), 1788 (C═O of β-lactam) and 1730 cm-1 (C═O of ester);
1 H NMR (200 MHz, CDCl3) δ: 0.07 and 0.08 (2s, 6H, SiCH3), 0.87 (s, 9H, Si-tBu), 1.28 (d, J=6.18 Hz, 3H, CH3 CHO), 1.6-2.2 (m, 2H, CH2 -4), 3.18 (dd, JH6,H5 =2.95 Hz, JH6,H1 =7.38 Hz, 1H, H-6), 3.1-3.5 (m, 3H, CH2 OH and H-4), 4.12 (dd, JH5,H6 =2.95 Hz, JH5,H4 =10.54 Hz, 1H, H-5), 4.19 (m, 1H, CH3 CHO), 4.65 (m, 2H, CH2 of allyl), 5.1-5.5 and 5.8-6.0 (2m, 2H and 1H, CH of allyl), and 7.2-7.5 (m, 10H, aromatics).
B. Allyl (4R,5S,6S)-3-((4S)-4-[1-N-allyloxycarbonyl-(2S)-2-dimethylaminocarbonyl]py rrolidinylthio}-4-(2"-azidoethyl)-6-[(1'R)-1'-tert-butyldimethylsilyloxyeth yl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate ##STR355##
A solution of allyl (4R,5S,6S)-4-(2"-azidoethyl)-3-diphenylphosphoryloxy-6-[(1'R)-1'-tert-buty ldimethylsilyloxy ethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate (3.84 g, 5.74 mmol) in dry acetonitrile (40 mL) was cooled to 0°-5°C and treated under nitrogen with N,N-diisopropylethylamine (2.0 mL, 11.6 mmol) followed by (2S,4S)-1-N-allyloxycarbonyl-2-dimethylaminocarbonyl-4-mercaptopyrrolidine [prepared according to the general procedures in EP-126,587] (3.0 g, 11.6 mmol) in acetonitrile (7 mL). After 17 h at 0°-5°C, the reaction mixture was diluted with ethyl acetate (500 mL), washed with cold water, saturated sodium bicarbonate, brine and dried (MgSO4). The residue obtained after evaporation of the solvent under reduced pressure was chromatographed on silica gel (5×10 cm) using a mixture of toluene and ethyl acetate (1:1) as eluent and gave 2.47 g (64%) of the title compound as a white foam:
IR (NaCl, film) νmax : 2100 (N3), 1780 (C═O of β-lactam), 1710 (C═O of ester) and 1660 cm-1 (C═O of amide);
1 H NMR (200 MHz, CDCl3) δ: 0.1 (s, 6H, SiCH3), 0.9 (s, 9H, Si-tBu), 1.31 (d, J=6.03 Hz, 3H, CH3 CHO), 1.6-2.1 (m, 3H, H-3 of pyrrolidine and CH2 -4), 2.6-2.8 (m, 1H, H-3 of pyrrolidine), 2.96, 2.98, 3.05 and 3.11 (4s, total 6H, NCH3), 3.1 (overlapping with NCH3, 1H, H-6), 3.3-3.8 (m, 5H, CH2 -5 of pyrrolidine, CH2 N3 and H-4), 4.1 (m, 1H, H-4 of pyrrolidine), 4.1-4.3 (m, 2H, H-5 and CH3 C HO), 4.5-4.9 (m, 5H, CH2 of allyl and H-2 of pyrrolidine), 5.1-5.5 and 5.8-6.1 ppm (2×m, 4H and 2H, CH of allyl).
Method B.
A. Allyl (4R,5S,6S)-3-((4S)-4-[1-N-allyloxycarbonyl-(2S)-2-dimethylaminocarbonyl]py rrolidinylthio)-6-[(1'R)-1'-tert-butyldimethylsilyloxyethyl]-4-(2"-hydroxye thyl)-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate ##STR356##
A solution of allyl (4R,5S,6S)-3-((4S)-4-[1-N-allyloxycarbonyl-(2S)-2-dimethylaminocarbonyl]py rrolidinylthio)-6-[(1'R)-1'-tert-butyldimethylsilyloxyethyl]-4-(2"-tert-but yldimethylsilyloxyethyl)-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate (2.64 g, 3.44 mmol) [prepared in Example 108, Step B] in dry tetrahydrofuran (50 mL) was treated at 0°-5°C and under nitrogen with acetic acid (1.2 mL, 21.0 mmol) followed by 10.3 mL (10.3 mmol) of a 1M solution of tetrabutylammonium fluoride in tetrahydrofuran. After 16 h at 10°C, the reaction mixture was diluted with ethyl acetate (400 mL) washed with cold saturated sodium bicarbonate, brine and dried (MgSO4). Evaporation of the solvent under reduced pressure gave an oil which was chromatographed on silica gel (4×8 cm). Elution with ethyl acetate gave 1.82 g (81%) of the title carbapenem as an oil:
IR (NaCl, film) νmax : 3450 (OH), 1755 (C═O of β-lactam), 1705 (C═O of ester) and 1650 cm-1 (C═O of amide);
1 H NMR (200 MHz, CDCl3) δ: 0.09 (s, 6H, SiCH3), 0.89 (s, 9H, Si-tBu), 1.29 (d, J=6.1 Hz, 3H, CH3 CHO), 1.6-2.1 (m, 3H, CH2 CH2 OH and H-3 of pyrrolidine), 2.6-2.8 (m, 1H, H-3 of pyrrolidine), 2.96, 2.98, 3.05 and 3.09 (4s, total 6H, CON(CH3)2), 3.17 (broad dd, JH6,H5 =2.5 Hz, JH6,H1 =6.1 Hz, 1H, H-6), 3.46 (.about. t, 2H, H-5 of pyrrolidine and H-4 overlapping), 3.6-3.9 (m, 3H, CH2 CH2 OH and H-5 of pyrrolidine), 4.1 (m, 1H, H-4 of pyrrolidine), 4.15-4.3 (m, 2H, H-5 and CH3 CHO), 4.5-4.9 (m, 5H, CH2 of allyl and H-2 of pyrrolidine), 5.1-5.5 and 5.9-6.1 ppm (2×m, 4H and 2H, CH of allyl).
B. Allyl (4R,5S,6S)-3-((4S)-[1-N-allyloxycarbonyl-(2S)-2-dimethylaminocarbonyl]pyrr olidinylthio)-4-(2"-azidoethyl)-6-[(1'R)-1'-tert-butyldimethylsilyloxyethyl ]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate ##STR357##
A solution of allyl (4R,5S,6S)-3-((4S)-4-[1-N-allyloxycarbonyl-(2S)-2-dimethylaminocarbonyl]py rrolidinylthio)-6-[(1'R)-1'-tert-butyldimethylsilyloxyethyl]-4-(2"-hydroxye thyl)-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate (1.82 g, 2.79 mmol) in dry tetrahydrofuran (200 mL) at -20°C and under nitrogen was treated with triphenylphosphine (1.17 g, 4.46 mmol) and 6.5 mL (4.81 mmol) of a 0.74M solution of hydrazoic acid in toluene. Diethyl azodicarboxylate (0.75 mL (4.76 mmol) was then added dropwise and the resulting mixture was stirred for 30 min. The reaction mixture was then diluted with ethyl acetate (500 mL), washed with cold saturated sodium bicarbonate, brine and dried (MgSO4). The solvent was then concentrated in vacuo to give a paste which was triturated at 0°-5°C with toluene (25 mL) and filtered to remove the crystalline diethyl hydrazinedicarboxylate. The liltrate was concentrated and treated in the same manner with diethyl ether (25 mL) to remove the triphenylphosphine oxide. The filtrate was then chromatographed on silica gel (4×11 cm) using a mixture of toluene and ethyl acetate (1:1) as eluent and gave 2.3 g of the title compound as an oil which was contaminated with triphenylphosphine oxide. The infrared and 1 H NMR spectra of the product are identical to the spectra of the product obtained in Method A.
C. Allyl (4R,5S,6S)-3-((4S)-4-[1-N-allyloxycarbonyl-(2S)-2-dimethylaminocarbonyl]py rrolidinylthio)-4-(2"-azidoethyl)-6-[(1'R)-1'-hydroxyethyl]-7-oxo-1-azabicy clo[3.2.0]hept-2-ene-2-carboxylate ##STR358##
A solution of allyl (4R,5S,6S)-3-((4S)-4-[1-N-allyloxycarbonyl-(2S)-2-dimethylaminocarbonyl]py rrolidinylthio)-4-(2"-azidoethyl)-6-[(1'R)-1'-tert-butyldimethylsilyloxyeth yl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate (2.47 g, 3.65 mmol) in dry tetrahydrofuran (50 mL) was cooled to 0°-5°C and treated under nitrogen with acetic acid (1.25 mL, 21.8 mmol) followed by 11.0 mL (11.0 mmol) of a 1M solution of tetrabutylammonium fluoride in tetrahydrofuran. The solution was stored at 10°C for 7 days. The reaction mixture was diluted with ethyl acetate (500 mL), washed with cold saturated sodium bicarbonate, brine and dried (MgSO4). Evaporation of the solvent under reduced pressure gave an oil which was chromatographed on silica gel (4×11 cm). Elution with a gradient of ethyl acetate in toluene (50→100%) gave 1.43 g (70%) of the title compound as a white foam:
IR (NaCl, film) νmax : 2105 (N3), 1780 (C═O of β-lactam) 1710 (C═O of ester) and 1650 cm-1 (C═O of amide);
1 H NMR (200 MHz, CDCl3) δ: 1.39 (d, J=6.17 Hz, 3H, CH3 CHO), 1.7-2.2 (m, 3H, H-3 of pyrrolidine and CH2 -4), 2.6-2.8 (m, 1H, H-3 of pyrrolidine), 2.96, 2.98, 3.06 and 3.10 (4×s, total 6H, NCH3), 3.15 overlapping with NCH3, 1H, H-6), 3.3-3.7 (m, 5H, CH2 -5 pyrrolidine, H-4 and CH2 N3), 4-4.2 (m, 1H, H-4 of pyrrolidine), 4.2-4.4 (m, 2H, H-5 and CH3 CHO), 4.5-4.9 (m, 5H, CH2 of allyl and H-2 of pyrrolidine), 5.1-5.5 and 5.7-6.1 ppm (2×m, 4H, and 2H, CH of allyl).
D. (4R,5S,6S)-4-(2"-Azidoethyl)-3-((4S)-4-[(2S)-2-dimethylaminocarbonyl]pyrro lidinylthio)-6-[(1'R)-1'-hydroxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene- 2-carboxylic acid ##STR359##
A solution of allyl (4R,5S,6S)-3-((4S)-4-[1-N-allyloxycarbonyl-(2S)-2-dimethylaminocarbonyl]py rrolidinylthio)-4-(2"-azidoethyl)-6-[(1'R)-1'-hydroxyethyl]-7-oxo-1-azabicy clo[3.2.0]hept-2-ene-2-carboxylate (1.18 g, 2.1 mmol) in dry dichloromethane (40 mL) was treated at 22°C and under nitrogen with tetrakis (triphenylphosphine)palladium [0] (0.1 g) followed by 0.91 mL (8.4 mmol) of N-methylaniline. After 1 h, the organic phase was extracted with cold water (3×40 mL) and the combined aqueous extract was maintained under vacuum to remove traces of organic solvent. The aqueous phase was then chromatographed on reversed phase silica gel (μ-Bondapak c18, 3.5×15 cm) using a gradient of acetonitrile (0-15%) in water as eluent. Lyophilization of the UV active fractions gave 0.50 g (54%) of the title carbapenem as a white amorphous powder: [α]D22 -56.2° (c 1.0, H2 O);
Purity by HPLC: 96% on μ-Bondapak c-18, 3.9 mm×30 cm, 15% CH3 CN--H2 O pH 7.4 phosphate buffer, flow rate 1 mLin, uv detector 302 nm, retention time 7.6 min;
UV (H2 O, pH 7.4 phosphate buffer) λmax : 302 nm (8,420);
IR (KBr) νmax : 2100 (N3), 1760 (C═O of β-lactam), 1655 (C═O of amide) and 1600 cm-1 (C═O of carboxylate);
1 H NMR (200 MHz, D2 O) δ: 1.33 (d, J=6.36 Hz, 3H, CH3 CHO), 1.7-2.3 (m, 3H, H-3 of pyrrolidine and CH2 -4), 3.0 and 3.07 (2×s, 2×3H, NCH3), 3.1 (m, 1H, H-3 of pyrrolidine), 3.3-3.7 (m, 5H, H-5 pyrrolidine, H-4, H-6 and CH2 N3), 3.77 (dd, Jgem =12.15 Hz, JH5,H4 =6.32 Hz, H-5 of pyrrolidine), 4.0 (m, 1H, H-4 of pyrrolidine), 4.27 (m, 1H, CH3 CHO) 4.30 (dd overlapping with CH3 CHO, JH5,H6 =2.7 Hz, H-5) and 4.9 ppm (overlapping with HOD, H-2 of pyrrolidine).
(4R,5S,6S)-4-(2"-Aminoethyl)-3-{(4S)-4-[(2S)-2-dimethylaminocarbonyl]pyrrol idinylthio}-6-[(1'R)-1'-hydroxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2 -carboxylic acid, acetic acid salt ##STR360##
A solution of (4R,5S,6S)-4-(2"-azidoethyl)-3-{(4S)-4-[(2S)-2-dimethylaminocarbonyl]pyrro lidinylthio}-6-[(1'R)-1'-hydroxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-carb oxylic acid (0.70 g, 1.60 mmol) in cold water (140 mL) was hydrogenated at 0°-5°C over 1.9 g of 5% palladium on alumina and under 45 psi of hydrogen for 1 h. Then 0.18 mL (3.2 mmol) of acetic acid was added (pH changed from 8.1 to 4.2) and the catalyst was filtered on a Celite pad. The filtrate was chromatographed on a reversed phase silica gel column (μBondapak C18, 2.5×13 cm) using water as eluent. The UV active fractions were combined, lyophilized and chromatographed a second time with the same column. Lyophilization of the pertinent fractions gave 0.35 g (47%) of the title carbapenem as a white amorphous powder: [α]D22 -47.8° (c 1.0, H2 O);
Purity by HPLC: 98.8% on μBondapak C18, 3.4 mm×30 cm, 5% CH3 CN--H2 O pH 7.4 phosphate buffer, flow rate 1 mLin, uv detector 300 nm, retention time 11.3 min;
UV (H2 O, pH 7.4 phosphate buffer) λmax : 300 nm (8,130);
IR (KBr) νmax : 1760 (C═O of β-lactam), 1660 (C═O of amide) and 1600 cm-1 (broad, C═O of carboxylate).
1 H NMR (200 MHz, D2 O) δ: 1.35 (d, J=6.35 Hz, 3H, CH3 CHO), 1.8-2.4 (m, 3H, H-3 of pyrrolidine and CH2 -4), 1.94 (s, CH3 CO2 H), 3.02 and 3.09 (2s, 2×3H, CON(CH3)2), 2.9-3.2 (m overlapping with NCH3, 3H, H-3 of pyrrolidine and CH2 NH2), 3.25-3.5 (m, 2H, H-5 of pyrrolidine and H-4), 3.51 (dd, JH6,H5 =2.89 Hz, JH6,H1 =6.44 Hz, 1H, H-6), 3.6-3.75 (m, 1H, H-5 of pyrrolidine), 3.98 (m, 1H, H-4 of pyrrolidine), 4.3 (m, 1H, CH3 CHO), 4.34 (dd overlapping with CH3 C HO, JH5,H6 =2.89 Hz, JH5,H4 =9.70 Hz, 1H, H-5) and 4.74 ppm (t, J=8.6 Hz, 1H, H-2 of pyrrolidine).
(4R,5S,6S)-4-(3"-Azidopropyl)-3-{(4S)-4-[(2S)-2-dimethylaminocarbonyl]pyrro lidinylthio}-6-[(1'R)-1'-hydroxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene- 2-carboxylic acid ##STR361## A. Allyl (4R,5S,6S)-3-((4S)-4-[1-N-allyloxycarbonyl)-(2S)-2-dimethylaminocarbonyl]p yrrolidinylthio)-4-(3"-azidopropyl)-6-[(1'R)-1'-hydroxyethyl]-7-oxo-1-azabi cyclo[3.2.0]hept-2-ene-2-carboxylate ##STR362##
A solution of allyl (2R,4R,5R,6S)-4-(3"-azidopropyl)-6-[(1'R)-1'-hydroxyethyl]-3,7-dioxo-1-aza bicyclo[3.2.0]heptane-2-carboxylate (8.23 mmole, prepared by cyclization of 3.0 g, 8.23 mmol of diazo precursor) in dry acetonitrile (60 mL) was treated at 0°-5°C and under nitrogen with diphenyl chlorophosphate (1.9 mL, 9.18 mmol) and N,N-diisopropylethylamine (1.6 mL, 9.18 mmol) added simultaneously over 5 min. A small crystal of 4-N,N-dimethylaminopyridine was then added and the solution was stirred for 1 h. Then more N,N-diisopropylethylamine (2.0 mL, 11.5 mmol) was added followed by a solution of (2S,4S 1-N-allyloxycarbonyl-2-dimethylaminocarbonyl-4-mercaptopyrrolidine (3.0 g, 11.65 mmol) in acetonitrile (7 mL) and the resulting mixture was stirred at 0°-5°C for 18 h. The reaction mixture was quenched by the addition of ethyl acetate (500 mL) and washed with cold water, saturated sodium bicarbonate, brine and dried (MgSO4). Evaporation of the solvent under reduced pressure gave an oil which was chromatographed on silica gel (6.5×12 cm). Elution with a gradient of ethyl acetate in toluene (1:1 to EtOAc) gave 1.59 g (33%) of the title compound as a white foam:
IR (NaCl, film) νmax : 2100 (N3), 1775 (C═O of β-lactam), 1705 (C═O of ester) and 1650 cm-1 (C═O of amide);
1 H NMR (200 MHz, CDCl3) δ: 1.37 and 1.39 (2d, J=6.1 Hz, and J=6.18 Hz, 3H, CH3 CHO), 1.5-2.0 (m, 5H, H-3 of pyrrolidine), CH2 -1 and 2 of propyl), 2.6-2.8 (m, 1H, H-3 of pyrrolidine), 2.96, 2.97, 3.05 and 3.1 (4S, total 6H, CON(CH3)2), 3.1-3.7 (m, 6H, CH2 -5 of pyrrolidine, CH2 N3, H-4 and H-6), 4.0 (m, 1H, H-4 of pyrrolidine), 4.1-4.3 (m, 2H, H-5 and CH3 CHO), 4.5-4.9 (m, 5H, H-2 of pyrrolidine and CH2 of allyl), 5.1-5.5 and 5.8-6.1 ppm (2m, 4H and 2H, CH of allyl).
B. (4R,5S,6S)-4-(3"-Azidopropyl)-3-((4S)-4-[(2S)-2-dimethylaminocarbonyl]pyrr olidinylthio}-6-[(1'R)-1'-hydroxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene -2-carboxylic acid ##STR363##
A solution of allyl (4R,5S,6S)-3-((4S)-4-[1-N-allyloxycarbonyl)-(2S)-2-dimethylaminocarbonyl]p yrrolidinylthio)-4-(3"-azidopropyl)-6-[(1'R)-1'-hydroxyethyl]-7-oxo-1-azabi cyclo[3.2.0]hept-2-ene-2-carboxylate (1.59 g, 2.76 mmol) in dry dichloromethane (50 mL) was treated at 22°C and under nitrogen with tetrakis (triphenylphosphine) palladium [0] (0.12 g) followed by 1.2 mL (11.1 mmol) of N-methylaniline. After 3 h the reaction mixture was extracted with water (3×50 mL), and the combined aqueous phase was maintained in vacuo to remove traces of organic solvent. Chromatography of the aqueous phase on reversed phase silica gel (μ-Bondapak C18, 3.5×15 cm) using a gradient of acetonitrile (0-15%) in water gave 0.60 g (48%) of the title carbapenem as a white amorphous powder after freeze drying: [α]D22 -47.7° (c 1.0, H2 O);
Purity by HPLC: 99% on μ-Bondapak C18, 3.9 mmB 30 cm, elution 15% CH3 CN--H2 O, pH 7.4 phosphate buffer, flow rate 1.5 mL/min, UV detector 302 nm, retention time 9.0 min;
UV (H2 O, pH 7.4 phosphate buffer) λmax : 302 nm (9,737);
IR (KBr) νmax : 2100 (N3), 1755 (C═O of β-lactam), 1655 (C═O of amide) and 1600 cm-1 (C═O of carboxylate);
1 H NMR (200 MHz, D2 O) δ: 1.32 (d, J=6.39 Hz, 3H, CH3 CHO), 1.4-2.0 (m, 5H, CH2 -1 and 2 of propyl and H-3 of pyrrolidine), 2.99 and 3.07 (2s, 2×3H, CON(CH3)2), 2.9-3.1 (overlapping with CON(CH3)2, 1H, H-3 of pyrrolidine), 3.2-3.5 (m, 5H, H-5 of pyrrolidine, H-4, H-6 and CH2 N3), 3.63 (dd, Jgem 12.25 Hz, JH5,H4 =6.16 Hz, 1H, H-5 of pyrrolidine), 3.93 (m, 1H, H-4 of pyrrolidine), 4.2-4.4 (m, 2H, H-5 and CH3 CHO overlapping) and 4.65 ppm (t, J=8.5 Hz, 1H, H-2 of pyrrolidine).
(4R,5S,6S)-4-(3"-Aminopropyl)-3-((4S)-4-[(2S)-2-dimethylaminocarbonyl]pyrro lidinylthio)-6-[(1'R)-1'-hydroxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene- 2-carboxylic acid, phosphate salt dibasic ##STR364##
A solution of (4R,5S,6S)-4-(3"-azidopropyl)-3-((4S)-4-[(2S)-2-dimethylaminocarbonyl]pyrr olidinylthio)-6-[(1'R)-1'-hydroxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene -2-carboxylic acid (0.51 g, 1.13 mmol) in cold water (100 mL) was hydrogenated over 0.5 g of 5% palladium on alumina at 45 psi of hydrogen and at 0°-5°C for 1 h. Then 50 mL of 0.2M pH 6.0 phosphate buffer was added and the catalyst was filtered on a Celite pad. The liltrate was chromatographed on reversed phase silica gel (μ-Bondapak C18, 3.5×14 cm) using a gradient of acetonitrile (0-10%) in 0.02M pH 7.0 phosphate buffer as eluent. The UV active fractions were combined and desalted on a similar column (2.5×14 cm) using water instead of buffer as eluent. Lyophilization of the uv active fractions gave 0.25 g (46%) of the title carbapenem as a white amorphous powder: [α]D22 -67.6° (c 1.0, H2 O);
Purity by HPLC: 99% on μ-Bondapak C18, 3.9 mm×30 cm, elution 8% CH3 CN--H2 O pH 7.4 phosphate buffer, flow rate 0.8 mLin, uv detector 302 nm, retention time 5.68 min;
UV (H2 O, pH 7.4 phosphate buffer) λmax : 302 (10,400);
IR (KBr) νmax : 1760 (C═O of β-lactam), 1645 (C═O of amide) and 1590 cm-1 (C═O of carboxylate);
1 H NMR (200 MHz, D2 O) δ1.33 (d, J=6.33 Hz, 3H, CH3 CHO), 1.4-2.0 (m, 5H, H-3 of pyrrolidine and CH2 -1 and 2 of propyl), 2.73 (m, 1H, H-3 of pyrrolidine), 2.97 and 3.07 (2s, 2×3H, CON(CH3)2), 3-3.2 (overlapping with NCH3, 4H, CH2 -5 of pyrrolidine and CH2 NH2), 3.34 (broad t, 1H, H-4), 3.38 (dd, JH6,H5 =2.59 Hz, JH6,H1 =6.27 Hz, 1H, H-6), 3.73 (m, 1H, H-4 of pyrrolidine), 4.10 (dd collapsed into a t, J=8.0 Hz, 1H, H-2 of pyrrolidine) and 4.2-4.4 ppm (m, 2H, CH3 CHO and H-5 overlapping).
(4R,5S,6S)-3-((4S)-4-[(2S)-2-Dimethylaminocarbonyl]pyrrolidinylthio)-4-(3"- guanidinopropyl)-6-[(1'R)-1'-hydroxyethyl]-7-oxo-1-azabicyclo[3.2∅]hept-2 -ene-2-carboxylic acid, phosphate salt dibasic ##STR365##
A solution of (4R,5S,6S)-4-(3"-aminopropyl)-3-{(4S)-4-[(2S)-2-dimethylaminocarbonyl]pyrr olidinylthio}-6-[(1'R)-1'-hydroxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene -2-carboxylic acid, phosphate salt dibasic (0.14 g, 0.33 mmol) in water (15 mL) at 0°-5°C was adjusted to pH 8-8.5 with 1N sodium hydroxide and then treated with aminoiminomethanesulfonic acid (0.22 g, 1.77 mmol) added in small portions over 5 min. The pH of the reaciton mixture was maintained at 8-8.5 during the addition and for another 2 h. Then 15 mL of 0.2M pH 6.0 phosphate buffer were added and resulting solution was chromatographed on reversed phase silica gel (μBondapak C18, 2.5×14 cm). Elution with a gradient of acetonitrile (0-15%) in water gave 0.068 g (45%) of the title compound as a white amorphous powder after freeze drying:
Purity by HPLC: 99% on μBondpak C18, 3.9 mm×30 cm, elution 8% CH3 CN--H2 O, pH 7.4 phosphate buffer, flow rate 1 mLin, UV detector 302 nm, retention time 7.2 min;
UV (H2 O, pH 7.4 phosphate buffer) λmax : 302 nm (10,800);
IR (KBr) νmax : 1755 (C═O of β-lactam), 1640 (C═O of amide) and 1590 cm-1 (sh, C═O of carboxylate);
1 H NMR (200 MHz, D2 O) δ: 1.32 (d, J=6.38 Hz, 3H, CH3 CHO), 1.4-2.0 (m, 5H, H-3 of pyrrolidine and CH2 -1 and 2 of propyl), 2.75 (m, 1H, H-3 of pyrrolidine), 2.97 and 3.08 (2s, 2×3H, NCH3), 3.1-3.4 (m, 5H, CH2 -5 of pyrrolidine, CH2 N-3 of propyl and H-4), 3.33 (dd, JH6,H5 =2.55 Hz, JH6,H1 =6.21 Hz, 1H, H-6), 3.75 (m, 1H, H-4 of pyrrolidine), 4.16 (X part of AMX system, JAX =8.8 Hz, JMX =7.4 Hz, 1H, H-2 of pyrrolidine), 4.25 (dd overlapping with CH3 CHO, JH5,H6 =2.55 Hz, 1H, H-5) and 4.27 ppm (m, 1H, CH3 CHO).
(4R,5S,6S)-4-(2"-Azidoethyl)-3-[(2-aminoethyl)thio]-6-[(1'R)-1'hydroxyethyl ]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR366## A. Allyl (4R,5S,6S)-3-[(2-allyloxycarbonylaminoethyl)thio]-4-(2"-azidoethyl)-6-[(1' R)-1'-tert-butyldimethylsilyloxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene- 2-carboxylate ##STR367##
A solution of allyl (2R,4R,5R,6S)-4-(2"-azidoethyl)-6-[(1'R)-1'-tert-butyldimethylsilyloxyethy l]-3,7-dioxo-1-azabicyclo[3.2.0]heptane-2-carboxylate (10.0 mmol, prepared by cyclization of 4.64 g, 10.0 mmol of diazo precursor) in dry acetonitrile (75 mL) was treated at 0°-5°C and under nitrogen with diphenyl chlorophosphate (2.3 mL, 11.1 mmol) and N,N-diisopropylethylamine (1.9 mL, 10.9 mmol) added simultaneously over 5 min. A small crystal of 4-N,N-dimethylaminopyridine was then added and the resulting mixture was stirred at 0°-5°C for 30 min. The solution was then treated with more N,N-diisopropylethylamine (6.0 mL, 34.5 mmol) followed by allyl 2-mercaptoethylcarbamate [see Example 116, Step A] (5.1 g, 33.4 mmol) in acetonitrile (5 mL) and the resulting mixture was stirred at 0°-5°C for 20 h. The solution was then diluted with ethyl acetate (500 mL) washed with water, saturated sodium bicarbonate, brine and dried (MgSO4). The residue obtained after evaporation of the solvent under vacuum was chromatographed on silica gel (5×10 cm) using a gradient of ethyl acetate (0-10%) in toluene as eluent. Evaporation of the pertinent fractions gave 4.37 g (75%) of the title compound as a light yellow oil. By TLC and 1 H NMR this material was contaminated with some impurities (disulfide) but was used as such in the next step:
IR (NaCl, film) νmax : 2100 (N3), 1775 (C═O of β-lactam) and 1720 cm-1 (broad, C═O of ester);
1 H NMR (200 MHz, CDCl3) δ: 0.09 (s, 6H, SiCH3), 0.89 (s, 9H, Si-tBu), 1.30 (d, J=6.05 Hz, 3H, CH3 CHO), 1.5-2.0 (m, 2H, CH2 -4), 2.8-3.6 (m, 8H, S CH2 CH2 N, CH2 N3, H-4 and H-6), 4.1-4.3 (m, 2H, H-5 and CH3 CHO), 4.5-4.9 (m, 4H, CH2 of allyl), 5.1-5.5 and 5.8-6.1 ppm (2m, 6H, and 2H, CH of allyl and NH).
B. Allyl (4R,5S,6S)-3-[(2-allyloxycarbonylaminoethyl)thio]-4-(2"-azidoethyl)-6-[(1' R)-1'-hydroxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate ##STR368##
A solution of allyl (4R,5S,6S)-3-[(1-allyloxycarbonylaminoethyl)thio]-4-(2"-azidoethyl)-6-[(1' R)-1'-tert-butyldimethylsilyloxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene- 2-carboxylate (4.37 g, 7.54 mmol) in dry tetrahydrofuran (120 mL) was treated at 0°-5°C and under nitrogen with acetic acid (2.7 mL, 47.5 mmol) followed by 24 mL (24.0 mmol) of a 1M solution of tetrabutylammonium fluoride in tetrahydrofuran added dropwise over 5 min. The solution was then stored at 10°C for 7 days. The reaction mixture was then diluted with ethyl acetate (500 mL), washed with saturated sodium bicarbonate (2×), brine and dried (MgSO4). Evaporation of the solvent under reduced presure gave an oil which was chromatographed on silica gel (6.5×11 cm) using a gradient of ethyl acetate in toluene (7:3 to 1:1) as eluent. Evaporation of the UV active fractions gave 1.17 g (33%) of the title compound as a clear oil:
IR (NaCl) νmax : 3480 (OH), 2100 (N3), 1770 (C═O of β-lactam) and 1710 cm-1 (C═O of ester);
1 H NMR (200 MHz, CDCl3) δ: 1.39 (d, J=6.24 Hz, 3H, CH3 CHO), 1.7-2.1 (m, 2H, CH2 -4), 2.7-3.15 (m, 2H, SCH2), 3.18 (dd, JH6,H5 =2.66 Hz, JH6,H1 =7.97 Hz, 1H, H-6), 3.2-3.7 (m, 5H, CH2 NH, CH2 N3 and H-4), 4.23 (m, overlapping with H-5, 1H, CH3 CHO), 4.25 (dd, JH5,H6 =2.66 Hz, JH5,H4 =9.57 Hz, 1H, H-5), 4.57 and 4.75 (2m, 2×2H, CH2 of allyl), 5.1-5.5 and 5.8-6.1 ppm (2m, 6H and 2H, CH of allyl and NH).
C. (4R,5S,6S)-4-(2"-Azidoethyl)-3-[(2-aminoethyl)thio]-6-[(1'R)-1'-hydroxyeth yl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR369##
A solution of allyl (4R,5S,6S)-3-[(2-allyloxycarbonylaminoethyl)thio]-4-(2"-azidoethyl)-6-[(1' R)-1'-hydroxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate (1.17 g, 2.5 mmol) in dry dichloromethane (30 mL) was treated at 22°C and under nitrogen with tetrakis(triphenylphosphine)palladium [0] (0.072 g) followed by N-methylaniline (1.6 mL, 14.8 mmol). The solution was stirred for 3 h while a precipitated appeared. The reaction mixture was extracted with cold water (3×35 mL) and the combined aqueous phase was maintained under vacuum to remove traces of organic solvent. The solution was then chromatographed on reversed phase silica gel (μBondapak C18, 2.5×14 cm) using a gradient of acetonitrile in water as eluent. Lyophilization of the UV active fractions gave 0.37 g (43%) of the title carbapenem as a white amorphous solid: [α]D> +21.5° (C 1.0, H2 O);
Purity by HPLC: 99.2% on μBondapak C18 (3.9 mm×30 cm, 10% CH3 CN--H2 O pH 7.4 phosphate buffer, flow rate 1 mLin, uv detector 302 nm, retention time 7.58 min;
UV (H2 O, pH 7.4 phosphate buffer) λmax : 298 nm (7401 nm);
IR (KBr) νmax : 2100 (N3), 1760 (C═O of β-lactam) and 1590 cm-1 (broad, C═O of carboxylate);
1 H NMR (200 MHz, D2 O) δ: 1.33 (d, J=6.38 Hz, 3H, CH3 CHO), 1.7-2.2 (m, 2H, CH2 -4), 2.9-3.7 (broad m, 7H, S CH2 CH2 NH2, CH2 N3 and H-4), 3.50 (dd, JH6,H5 =2.67 Hz, JH6,H1 =6.24 Hz, 1H, H-6) and 4.2-4.4 ppm (m, 2H, H-5 and CH3 CHO overlapping).
(4R,5S,6S)-4-(2"-Aminoethyl)-3-[(2-aminoethyl)thio]-6-[(1'R)-1'-hydroxyethy l]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid, acetic acid salt ##STR370##
A solution of (4R,5S,6S)-3-[(2-aminoethyl)thio]-4-(2"-azidoethyl)-6-[(1'R)-1'-hydroxyeth yl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid (0.30 g, 0.88 mmol) in cold water (90 mL) was hydrogenated at 0°-5°C over 1.2 g of 5% palladium on alumina and under 45 psi of hydrogen for 50 min. Then 0.1 mL (1.6 mmol) of acetic acid was added (pH changed grom 9.3 to 4.3) and the catalyst was filtered on a Celite pad. The filtrate was chromatographed on reversed phase silica gel (2.5×14 cm) using 0.005M aqueous acetic acid as eluent. The product was eluted very fast from the column with the solvent front. The UV active fractions were combined, lyophilized and chromatographed on the same column a second time. Lyophilization gave 0.22 g (66%) of the title carbapenem as a white amorphous powder. By UV and 1 H NMR, this product was 60% pure and contained some inorganic salts of acetic acid (based on a UV absorption of 7400 for the azido precursor);
Purity by HPLC: 99% on μBondapak C18, 3.9 mm×30 cm, elution 5% CH3 CN--H2 O pH 7.4 phosphate buffer, flow rate 0.9 mLin, uv detector 300 nm, retention time 5.7 min;
UV (H2 O, pH 7.4 phosphate buffer) λmax : 296 nm (4,446);
IR (KBr) νmax : 1760 (C═O of β-lactam) and 1570 cm-1 (broad, C═O of carboxylate);
1 H NMR (200 MHz, D2 O) δ: 1.33 (d, J-6.36 Hz, 3H, CH3 CHO), 1.9 (s, CH3 CO2 H), 1.8-2.4 (m, 2H, CH2 -4), 2.8-3.45 (m, 7H, S CH2 CH2 NH2, H-4 and CH2 NH2), 3.49 (dd, JH6,H5 =2.84 Hz, JH6,H4 =6.42 Hz, 1H, H-6), 4.2-4.4 ppm (m, 2H, H-5 and CH3 CHO).
(4R,5S,6S)-3-[(2-Aminoethyl)thio]-4-(3"-azidopropyl)-6-[(1'R)-1'-hydroxyeth yl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR371## A. Allyl 2-mercaptoethylcarbamate
HSCH2 CH2 NH2.HCl+CH2 ═CH--CH2 OCOCl→HSCH2 CH2 NHCO2 CH2 --CH═CH2
A suspension of 2-aminoethanethiol hydrochloride (4.4 g, 38.7 mmol) in dry acetonitrile (30 mL) was cooled to 0°-5°C and treated under nitrogen with N,N-diisopropylethylamine (16.0 mL, 91.8 mmol). After 5 min, trimethylsilyl chloride (6.56 mL, 51.7 mmol) was added all at once and the mixture was stirred for 15 min. Then allyl chloroformate (4.24 mL, 40.0 mmol) followed by N,N-diisopropylethylamine (6.9 mL, 29.6 mmol) were added dropwise (10 min) and the resulting mixture was stirred for 30 min at 0°-5°C and for 2 h at 22°C Water (100 mL) was then added and the reaction mixture was extracted with dichloromethane (2×100 mL). The combined organic phase was washed with 1N hydrochloric acid (20 mL), 0.2M pH 7.0 phosphate buffer, brine and dried (Na2 SO4). Evaporation of the solvent under reduced pressure gave 6.5 g of the crude thiol as a clear oil which was used immediately for the coupling step. The preparation of the title compound was based on the procedure of I. Shinkai et al, Synthesis, 924, (1980).
1 H NMR (200 MHz, CDCl3) δ: 1.36 (t, J=8.53 Hz, 1H, SH), 2.66 (m, 2H, SCH2), 3.37 (m, 2H, CH2 N), 4.57 (m, 2H, CH2 of allyl), 5.2 (broad, 1H, NH), 5.2-5.4 and 5.8-6.1 ppm (2m, 2H and 1H, CH of allyl).
B. Allyl (4R,5S,6S)-3-[(2-allyloxycarbonylaminoethyl)thio]-4-(3"-azidopropyl)-6-[(1 'R)-1'-hydroxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate ##STR372##
A solution of allyl (4R,5R,6S)-4-(3"-azidopropyl)-6-[(1'R)-1'-hydroxyethyl]-3,7-dioxo-1-azabic yclo[3.2.0]heptane-2-carboxylate (11.0 mmol, prepared by cyclization of 4.0 g, 11.0 mmol of the diazo precursor) in dry acetonitrile (50 mL) was cooled to 0°-5°C and treated dropwise with diphenyl chlorophosphate (2.3 mL, 11.5 mmol) and N,N-diisopropylethylamine (2.3 mL, 11.5 mmol) added simultaneously over 5 min. A small crystal of 4-N,N-dimethylaminopyridine was then added and the solution was stirred for 1 h. The hydroxyl group was then silylated by the dropwise addition of N,N-diisopropylethylamine (2.3 mL, 11.5 mmol) followed by chlorotrimethylsilane (1.46 mL, 11.5 mmol) and the resulting mixture was stirred for 15 min. Then more N,N-diisopropylethylamine (3.8 mL, 21.9 mmol) and the allyl 2-mercaptoethylcarbamate (3.53 g, 21.9 mmol) were added and the mixture was stirred at 0°-5°C for 16 h. The reaction mixture was quenched by the addition of ethyl acetate (400 mL) and water. The organic phase was washed with 2% cold aqueous citric acid, 0.2M pH 7.0 phosphate buffer, brine and dried (MgSO4). The solvent was evaporated under reduced pressure and the residue was dissolved in a mixture of tetrahydrofuran (100 mL) and water (50 mL) and treated at 0°-5°C with acetic acid (5 mL). After 1 h at 0°-5°C and 2 h at 22°C, the reaction mixture was diluted with ethyl acetate (400 mL), washed successively with cold saturated sodium bicarbonate, 0.2M pH 7.0 phosphate buffer, brine and dried (MgSO4). Evaporation of the solvent under reduced pressure gave an oil which was chromatographed on silica gel (4×12 cm). Elution with a gradient of ethyl acetate in toluene (8:7 to 1:1) gave 3.19 g (61%) of the title compound as an oil:
IR (NaCl, film) νmax : 3400 (OH), 2100 (N3), 1755 (C═O of β-lactam) and 1705 cm-1 (broad, C═O of ester);
1 H NMR (200 MHz, CDCl3) δ: 1.39 (d, J=6.25 Hz, 3H, CH3 CHO), 1.5-2.0 (m, 4H, CH2 -1 and 2 of propyl), 2.7-3.2 (m, 2H, SCH2), 3.24 (dd, JH6,H5 =2.63 Hz, JH6,H1 =7.46 Hz, 1H, H-6), 3.2-3.6 (m, 5H, CH2 N3, CH2 N and H-4), 4.24 (dd, JH5,H6 =2.63 Hz, JH5,H4 =9.43 Hz, 1H, H-5), 4.24 (overlapping with H-5, 1H, CH3 CHO), 4.56 and 4.75 ppm (2m, 2×2H, CH2 of allyl), 5.1-5.5 (m, 5H, CH of allyl and NH) and 5.8-6.1 ppm (m, 2H, CH of allyl).
C. (4R,5S,6S)-3-[(2-Aminoethyl)thio]-4-(3"-azidopropyl)-6-[(1'R)-1'-hydroxyet hyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR373##
A solution of allyl (4R,5S,6S)-3-[(2-allyloxycarbonylaminoethyl)thio]-4-(3"-azidopropyl)-6-[(1 'R)-1'-hydroxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate (3.19 g, 6.65 mmol) in dry dichloromethane (80 mL) was treated at 22°C and under nitrogen with tetrakis(triphenylphosphine)palladium [0] (0.19 g) and N-methylaniline (4.3 mL, 40.0 mmol). After 3 h, the reaction mixture which contained a gel-like precipitate was diluted with cold water (200 mL) and adjusted to pH 3.8 with 2N hydrochloric acid to dissolve the amino acid. The cold aqueous phase was collected, washed with dichloromethane, adjusted to pH 6.5 with 1N sodium hydroxide and maintained under vacuum to remove traces of organic solvent. The solution was then chromatographed on reversed phase silica gel (μBondapak C18, 3×15 cm) using a gradient of acetonitrile (0-10%) in water as eluent. Lyophilization of the UV active fractions gave 1.28 g (54%) of the title compound as a white amorphous powder: [α]D22 +32.6° (c 1.0, H2 O);
Purity by HPLC: 99% on μBondapak C18, 3.9 mm×30 cm, elution 10% CH3 CN--H2 O pH 7.4 phosphate buffer, flow rate 1 mLin, uv detector 300 nm, retention time 13.3 min;
UV (H2 O, pH 7.4 phosphate buffer) λmax : 298 nm (8,425);
IR (KBr) νmax : 2100 (N3), 1760 (C═O of β-lactam) and 1590 cm-1 (C═O of carboxylate);
1 H NMR (200 MHz, D2 O) δ: 1.33 (d, J=6.37 Hz, 3H, CH3 CHO), 1.5-2.0 (m, 4H, CH2 -1 and 2 of propyl), 2.8-3.5 (m, 5H, S CH2 CH2 NH2 and H-4), 3.42 (t, J=6.2 Hz, 3H, CH2 N3), 3.47 (dd, JH6,H5 =2.70 Hz, JH6,H1 =5.98 Hz, 1H, H-6), 4.26 (dd, JH5,H6 =2.70 Hz, JH5,H4 =9.35 Hz, 1H, H-5) and 4.28 ppm (m overlapping with H-5, 1H, CH3 CHO).
(4R,5S,6S)-4-(3"-Aminopropyl)-3-[(2-aminoethyl)thio]-6-[(1'R)-1'-hydroxyeth yl]-7-oxo-1-azabjcyclo[3.2.0]hept-2-ene-2-carboxylic acid, acetic acid salt ##STR374##
A solution of (4R,5S,6S)-3-[(2-aminoethyl)thio]-4-(3"-azidoethyl)-6-[(1'R)-1'-hydroxyeth yl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid (0.292 g, 0.82 mmol) in water (90 mL) was hydrogenated at 0°-5°C over 1.2 g of 5% palladium on alumina and under 45 psi of hydrogen for 1 h. Then 0.1 mL (1.64 mmol) of acetic acid was added and the catalyst was filtered on a Celite pad. The filtrate was then chromatographed on reversed phase silica gel (μBondapak C18, 3×12 cm) using 0.005M aqueous acetic acid as eluent. The UV active fractions were combined and lyophilized to give 0.264 g (82%) of the title compound as a white amorphous solid: [α]D2 +37.0° (c 1.0, H2 O);
Purity by HPLC: 98% on μBondapak C18, 3.9 mm×30 cm, elution 5% CH3 CN--H2 O pH 7.4 phosphate buffer, flow rate 0.8 mLin, UV detector 300 nm, retention time 4.9 min;
UV (H2 O, pH 7.4 phosphate buffer) λmax : 298 nm (7,517);
IR (KBr) νmax : 1755 (C═O of β-lactam) and 1570 cm-1 (broad, C═O of carboxylate);
1 H NMR (200 MHz, D2 O) δ: 1.33 (d, J=6.34 Hz, 3H, CH3 CHO), 1.4-2.0 (m, 4H, CH2 -1 and 2 of propyl), 1.92 (s, CH3 CO2 H), 2.8-3.4 (m, 7H, S CH2 CH2 NH2, CH2 NH2 -3 of propyl and H-4), 3.43 (dd, JH6,H5 =2.73 Hz, JH6,H1 =6.37 Hz, 1H, H-6), 4.2-4.3 ppm (m, 2H, H-5 and CH3 CHO overlapping).
(4R,5S,6S)-4-(3"-Azidopropyl)-3-[(2-N-formimidoylaminoethyl)thio]6-[(1'R)-1 '-hydroxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR375##
A suspension of (4R,5S,6S)-3-[(2-aminoethyl)thio]-4-(3"azidopropyl)-6-[(1'R)-1'-hydroxyeth yl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid (0.460 g, 1.29 mmol) in cold water (25 mL) was adjusted to pH 8.5 with 1M sodium hydroxide and treated at 0°-5°C with benzyl formimidate hydrochloride (0.78 g, 4.52 mmol) added in small portions over 10 min. The pH was maintained at 8-8.5 with 1M sodium hydroxide throughout the addition and for another 25 min. Then 20 mL of 0.2M pH 6 phosphate buffer were added and the reaction mixture was washed with ethyl acetate (20 mL). The aqueous phase was maintained under vacuum to remove traces of organic solvent and then chromatographed on reversed phase silica gel (μBondapak C18, 2.5×11 cm). The column was eluted with a gradient of acetonitrile (0-15%) in 0.01M phosphate buffer. The UV active fractions were combined concentrated in vacuo (T <20°C) and desalted on the same column using water instead of buffer as eluent. Lyophilization of the pertinent fractions gave 0.240 g (48%) of the title compound as a white amorphous powder: [α]D22 +16.0 (c 1.0, H2 O);
Purity by HPLC: 99.4% on μBondapak C18, 3.9 mm×30 cm, elution 20% CH3 CN--H2 O, pH 7.4 phosphate buffer, flow rate 0.8 mLin, UV detector 300 nm, retention time 6.06 min;
UV (H2 O, pH 7.4 phosphate buffer) λmax : 302 nm (9,768);
IR (KBr) νmax : 2100 (N3), 1955 (C═O of β-lactam), 1715 (CN of formimidoyl) and 1590 cm-1 (C═O of carboxylate);
1 H NMR (200 MHz, D2 O) δ: 1.33 (d, J=6.35 Hz, 3H, CH3 CHO), 1.4-2.0 (m, 4H, CH2 -1 and 2 of butyl), 2.8-3.3 (m, 2H, SCH2), 3.3-3.8 (m, 6H, H-6, H-4, CH2 N3 and CH2 NH), 4.2-4.4 (m, 2H, H-5 and CH3 CHO overlapping), 7.76 and 7.83 ppm (2S, 1H, NH CH═NH).
(4R,5S,6S)-4-(3"-Aminopropyl)-3-[(2-N-formimidoylaminoethyl)thio]-6-[(1'R)- 1'-hydroxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid, acetic acid salt ##STR376##
A solution of (4R,5S,6S)-4-(3"-azidopropyl)-3-[(2-N-formimidoylaminoethyl)thio]-6-[(1'R) -1'-hydroxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid (0.180 g, 0.47 mmol) in cold water (70 mL) was hydrogenated at 0°-5°C over 1.2 g of 5% palladium on alumina and under 45 psi of hydrogen for 1 h. Then acetic acid (0.045 mL, 0.79 mmol) was added and the catalyst was filtered on a Celite pad. The filtrate was then chromatographed on reversed phase silica gel (μBondapak C18, 3×10 cm) using 0.005M acetic acid as eluent. Lyophilization of the UV active fractions gave 0.136 g (69%) of the title compound as a white amorphous solid: [α]D22 +17.5° (c 1.0 H2 O);
Purity by HPLC: 94% on μBondapak C18, 3.9 mm×30 cm, elution 5% CH3 CN--H2 O pH 7.4 phosphate buffer, flow rate 1 mLin, UV detector 300 nm, retention time 7.57 min;
UV (H2 O, pH 7.4 phosphate buffer) λmax : 300 nm (6,900);
IR (KBr) 84max : 1755 (C═O of β-lactam), 1720 (CN of formimidoyl) and 1570 cm-1 (broad, C═O of carboxylate);
1 H NMR (200 MHz, D2 O) δ: 1.33 (d, J=6.36 Hz, 3H, CH3 CHO), 1.5-2.0 (m, 4H, CH2 -1 and 2 of propyl), 1.92 (s, 3H, CH3 CO2 H), 3.04 (t, J=7.0 Hz, 2H, CH2 NH2), 3.42 (dd, JH6,H5 =2.64 Hz, JH6,H1 =6.31 Hz, 1H, H-6), 2.8-3.7 (m, 5H, SCH2, CH2 NHCH═NH and H-4), 4.26 (dd, overlapping with CH3 CHO, JH5,H6 =2.64 Hz, 1H, H-5), 4.28 (m, 1H, CH3 CHO), 7.74 and 7.83 ppm (2S, 1H, NH CH═NH).
(4R,5S,6S)-4-(3"-Aminopropyl)-6-[(1'R)-1'-hydroxyethyl]-3-[2-(1-pyrrolidiny l)ethylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid, acetic acid salt ##STR377## A. Allyl (4R,5S,6S)-4-(3"-azidopropyl)-3-[(2-hydroxyethyl)thio]-6-[(1'R)-1'-triethy lsilyloxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate ##STR378##
A cold (ice-methanol bath) solution of allyl (2 R,4 R,5 R,6 S)-4-(3"-azidopropyl)-6-[(1' R)-1'-hydroxyethyl]-3,7-dioxo-1-azabicyclo[3.2.0]heptan-2-carboxylate [prepared from (3 S,4 R)-3-[(1' R)-1'-hydroxyethyl]-4-[(1" R)-1"-(3- azidopropyl)-3"-diazo-3"-allyloxycarbonyl-2"-oxopropyl]-azetidin-2-one (1.0 g, 2.75 mmol)] was treated slowly with diphenyl chlorophosphate (0.6 mL, 3.0 mmol) followed by the dropwise addition of diisopropylethylamine (0.52 mL, 3.0 mmol). The mixture was stirred for 1 h, then triethylsilyl chloride (0.5 mL, 3 mmol) and diisopropylethylamine (0.52 mL, 3.0 mmol) were added in. The mixture was stirred for 30 min at -15°C The resulting silylated enol phosphate was treated with 2-mercaptoethanol (430 mg, 5.5 mmol) in CH3 CN (0.5 mL) and diisopropylethylamine (0.95 mL, 5.5 mmol). The mixture was stirred for 19 h at 5°-8°C (cold room), then diluted with ethyl acetate (50 mL), washed with ice cold water (2×20 mL), 1M aqueous NaHSO3 (3×20 mL), water (20 mL), 1N aqueous HCl (20 mL), water (2×20 mL), 1M aqueous NaHCO3 (20 mL), water (20 mL), brine (20 mL) and dried (MgSO4). The residue was passed through a silica gel flash column (50 g, 0-50% ethyl acetateexane) to give the title compound (883 mg, 63%) as an oil.
IR (CH2 Cl2) νmax : 3600 (OH), 2100 (N3), 1775 (C═O β-lactam) and 1710 cm-1 (C═O ester);
1 H NMR (CDCl3, 200 MHz) δ: 6.05-5.8 (1H, m, vinylic H), 5.49-5.2 (2H, m, vinylic H), 4.9-4.6 (2H, m, allylic CH2), 4.30-4.16 (1H, m, H-1'), 4.145 (1H, dd, J=2.5 Hz, J=9.6 Hz, H-5), 3.803 (2H, t, J=5.9 Hz, CH2 O, 3.40-3.28 (2H, m, CH2 N3), 3.24-3.28 (1H, m, H-1'), 3.192 (1H, dd, J=2.8 Hz, J=7.5 Hz, H-6), 3.15-2.87 (2H, m, SCH2), 1.89-1.75 (1H, m, part of CH2 -4), 1.7-1.45 (3H, m, CH2 --CH2 at 4), 1.552 (1H, bs, OH), 1.316 (3H, d, J=6.1 Hz, CH3), 0.998, 0.957 and 0.920 (9H, 3 lines, CH3), 0.662, 0.659, 0.623,0.584, 0.546 and 0.539 ppm (6H, 6 lines, CH2).
B. Allyl (4R,5S,6S)-4-(3"-azidopropyl)-3-[2-(1-pyrrolidinyl)ethylthio]-6-[(1'R)-1'- triethylsilyloxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate ##STR379##
A cold (dry ice-acetone) solution of allyl (4 R,5 S,6 S)-4-(3"-azidopropyl)-3-[(2-hydroxyethyl)thio]-6-[(1' R)-1'-triethylsilyloxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxy late (883 mg, 1.73 mmol) in dichloromethane (20 mL) was treated first with diisopropylethylamine (0.80 mL, 4.5 mmol) and dropwise with trifluoromethanesulfonic anhydride (0.35 mL, 2.1 mmol). The mixture was stirred for 20 min and pyrrolidine (0.90 mL, 10.4 mmol) in dichloromethane (1 mL) was added in. Stirring was continued for 30 min at -78°C (dry ice-acetone) and for 30 min at -15°C (ice-methanol bath). The reaction mixture was diluted with ethyl acetate (100 mL) and petroleum ether (20 mL), washed with ice cold water (10×25 mL), brine (25 mL), dried (MgSO4) and the residue upon solvent evaporation was passed through a silica gel flash pad (45 g, 33→100% ethyl acetateexane, 10%→40% acetone/ethyl acetate) to give title compound (510 mg, 52%) as an oil.
IR (CH2 Cl2) νmax : 2100 (N3), 1775 (C═O β-lactam) and 1710 cm-1 (C═O ester);
1 H NMR (CDCl3, 200 MHz) δ: 6.03-5.9 (1H, m, vinylic H), 5.49-5.21 (2H, m, vinylic H), 4.9-4.6 (2H, m, allylic CH2), 4.30-4.14 (1H, m, H-1'), 4.121 (1H, dd, J=2.6 Hz, J=9.6 Hz, H-5), 3.4-3.30 (2H, m, CH2 N3), 3.23-3.14 (1H, m, H-4), 3.169 (1H, dd, J=2.6 Hz, J=7.6 Hz, H-6), 2.98-2.88, 2.75-2.63 (2H, 2 sets of m, SCH2), 2.63-2.45 (6H, m, CH2 N), 1.9-1.5 (8H, m, CH2 CH2 -4 and CH2 CH2 pyrrolidine), 1.317 (3H, d, J=6.1 Hz, CH3), 0.0993, 0.952, 0.916 (9H, 3 lines, CH3), 0.697, 0.658, 0.655, 0.619, 0.579, 0.542 and 0.535 ppm (6H, 7 lines, SiCH2).
C. Allyl (4R,5S,6S)-4-(3"-azidopropyl)-6-[(1'R)-1'-hydroxyethyl]-3-[2-(1-pyrrolidin yl)ethylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate ##STR380##
A cold (ice-methanol) solution of allyl (4 R,5 S,6 S)-4-(3"-azidopropyl)-3-[2-(1-pyrrolidinyl)ethylthio]-6-(1' R)-1'-triethylsilylethylsilyloxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene -2-carboxylate (500 mg, 0.77 mmol) in anhydrous tetrahydrofuran (5 mL) was treated first with glacial acetic acid (0.290 mL, 5.28 mmol) followed by the dropwise addition of a 1M solution of tetrabutylammonium fluoride in tetrahydrofuran (2.64 mL, 2.64 mmol). The mixture was allowed to stand at -20°C for 20 h, then diluted with ethyl acetate (25 mL), washed with ice cold 1M aqueous NaHCO3, (3×10 mL), brine (10 mL) dried (MgSO4). The residue obtained (370 mg, 94%) upon solvent evaporation was used as such in the next step.
IR (CH2 Cl2) νmax : 3600 (OH), 2100 (N3), 1775 (C═O β-lactam) and 1710 cm-1 (C═O ester);
1 H NMR (CDCl3, 200 MHz) δ: 6.04-5.90 (1H, m, vinylic H), 5.49-5.22 (2H, m, vinylic H), 4.82-4.62 (2H, m, allylic H), 4.27-4.18 (1H, m, H-1'), 4.217 (1H, dd, J=2.7 Hz, J=9.7 Hz, H-5), 3.45-3.25 (3H, m, CH2 N3 and H-4), 3.233 (1H, dd, J=2.7 Hz, J=7.6 Hz, H-6), 2.99-2.82, 2.76-2.65 (2H, 2 sets of m, SCH2), 2.65-2.4 (6H, m, CH2 N), 1.95-1.50 (9H, m, CH2 CH2 -4, OH and CH2 CH2 pyrrolidine) and 1.388 ppm (3H, d, J=6.2 Hz, CH3).
D. (4R,5S,6S)-4-(3"-Azidopropyl)-6-[(1'R)-1'-hydroxyethyl]-3-[2-(1-pyrrolidin yl)ethylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR381##
A cold (ice bath) solution of allyl (4 R,5 S,6 S)-4-(3"-azidopropyl)-6-[(1' R)-1'-hydroxyethyl]-3-[2-(1-pyrrolidinyl)ethylthio]-7-oxo-1-azabicyclo[3.2 .0]hept-2-ene-2-carboxylate (360 mg, 0.80 mmol) in dichloromethane (20 mL) was treated first with Pd(PPh3)4 followed by the dropwise addition of a N-methyl aniline (0.17 mL, 1.6 mmol). The mixture was stirred for 15 min, then a 0.1M pH 7.0 aqueous phosphate buffer (50 mL, 5 mmol) and diethyl ether (50 mL) were added in. The organic phase was extracted again with the 0.1M pH 7.0 buffer (2×15 mL) and water (15 mL). The aqueous extracts were combined, washed with diethyl ether (2×25 mL) and passed through a μBondapak C18 reversed phase column (50 g, 0→30% CH3 CN2 O) to give title compound (200 mg, 58%) as a lyophilized powder.
Purity: 99.9% as determined by HPLC (r.t.=7.751, μBondapak C18, 10μ, 15% CH3 CN/KH2 PO4 0.01M, pH 7.4);
UV (water) λmax : 296 (7170);
IR (Nujol) νmax : 3500-3100 (OH), 2100 (N3), 1755 (C═O β-lactam) and 1600 cm-1 (C═O carboxylate);
1 H NMR (D2 O, 200 MHz) δ: 4.35-4.20 (1H, m, H-1'), 4.263 (1H, dd, J=2.7 Hz, J=9.4 Hz, H-5), 3,475 (1H, dd, J=2.7 Hz, J=6.1 Hz, H-6), 3.46-3.39 (2H, m, CH2 N), 3.10-2.9 (1H, m, 1H of SCH2), 2.10-1.85 (5H, m, CH2 CH2 pyrrolidine and 1H of CH2 -4), 1.80-1.45 (3H, m, CH2 CH2 -4) and 1.331 ppm (3H, d, J=6.4 Hz, CH3).
E. (4R,5S,6S)-4-(3"-Aminopropyl)-6-[(1'R)-1'-hydroxyethyl]-3-[2-(1-pyrrolidin yl)ethylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid, acetic acid salt ##STR382##
A cold (ice bath) solution of (4 R,5 S,6 S)-4-(3"-azidopropyl)-6-[(1' R)-1'-hydroxyethyl]-3-[2-(1-pyrrolidinyl)ethylthio]-7-oxo-1-azabicyclo[3.2 .0]hept-2-ene-2-carboxylic acid (150 mg, 0.34 mmol) in water (30 mL) was shaken in a Parr hydrogenator at 45-50 psi of hydrogen for 1 h using 5% Pdlumina (750 mg) as catalyst. The catalyst was removed, washed with water (2×5 mL), and the pH of the solution (9.5) was adjusted to 4.6 with a 1M aqueous acetic acid solution. The aqueous solution was passed twice through a μBondapak C18 reversed phase column (45 g and 35 g, 0.005M aqueous acetic acid, 1%→2% CH3 CN/0.005M aqueous acetic acid) to give the title compound (138 mg, 67%) as a pale yellow lyophilized powder.
Purity: 99.5% as determined by HPLC (r.t.=7.338, μBondapak C18, 10μ, 10% CH3 CN/KH2 PO4, 0.01M, pH 7.4);
UV (H2 O) λmax : 296 (8426);
IR (Nujol) νmax : 3500-3100 (OH, NH2), 1755 (C═O β-lactam) and 1590 cm-1 (C═O carboxylate);
1 H NMR (D2 O, 200 MHz) δ: 4.33-4.20 (2H, m, H-1'and H-5), 3.412 (1H, dd, J=2.6 Hz, J=6.4 Hz, H-6), 3.5-3.1 (1H, m, CH2 N, H-4, 1H of SCH2), 3.09, 3.051, 3.016 (2H, 3 lines, CH2 N), 3.10-2.95 (1H, m, 1H of SCH2), 2.09 (4H, bs, CH2 CH2 pyrrolidine), 1.92 (2H, s, CH3 CO2), 2.0-1.45 (4H, m, CH2 CH2 -4) and 1.331 ppm (3H, d, J=6.4 Hz, CH3).
(4R,5S,6S)-4-(4"-Aminopentyl)-3-[(2-cyanoethyl)thio]-6-[(1'R)-1'-hydroxyeth yl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR383## A. 7-Azidoheptanoic acid ##STR384##
7-Bromoheptanoic acid (50.0 g, 0.24 mol) was added to a solution of sodium hydroxide (9.6 g, 0.24 mol) in 75 ml of water. Then sodium azide (20.9 g, 0.32 mol) was added and the resulting mixture was heated under reflux for 17 h. The solution was then cooled to 0°-5°C, acidified to pH 2.0 with 2N sulfuric acid and extracted with diethyl ether (3×200 mL). The combined organic extract was washed with brine, dried (MgSO4) and evaporated under vacuum to give 40.9 g (100%) of the title acid as an oil. By 1 H NMR the crude product contained 6% (mole) of the starting bromo acid and was used as such for the acid chloride formation.
IR (NaCl, film) νmax : 2100 (N3) and 1710 cm-1 (C═O of acid);
1 H NMR (200 MHz, CDCl3) δ: 1.3-1.8 (m, 8H, CH2 -3,4,5 and 6), 2.36 (t, J=7.35 Hz, 2H, CH2 -2) and 3.26 ppm (t, J=6.77 Hz, 2H, CH2 -7).
B. 7-Azidoheptanoyl chloride
N3 (CH2)6 CO2 H→N3 (CH2)6 COCl
A solution of 7-azidoheptanoic acid from Step A (40.9 g, 0.24 mol) in dry dichloromethane (200 mL) was treated at 22°C with oxalyl chloride (22.0 mL, 0.25 mol) dropwise over 10 min. After 1 h, two drops of N,N-dimethylformamide were added and the mixture was stirred for another hour. Evaporation of the solvent under reduced pressure gave the crude acid chloride as an oil which was used as such for the next step:
IR (NaCl, film) νmax : 2100 (N3) and 1800 cm-1 (C═O of acid chloride);
1 H NMR (200 MHz, CDCl3) δ: 1.3-1.9 (m, 8H, CH2 -3,4,5 and 6), 2.9 (t, J=7.18 Hz, 2H, CH2 -2) and 3.27 ppm (t, J=6.7 Hz, 2H, CH2 -7).
C. 2-Picolyl 7-azidothiolheptanoate ##STR385##
A solution of 2-picolyl mercaptan (30.0 g, 0.24 mol) in dry dichloromethane (400 mL) was treated at 0°-5°C and under argon with pyridine (21.0 mL, 0.26 mol) followed by a solution of 7-azidheptanoyl chloride (45.5 g, 0.24 mol) in dichloromethane (100 mL) dropwise over 10 min. After 30 min, the reaction mixture was washed with cold saturated sodium bicarbonate, brine and dried (MgSO4). Evaporation of the solvent under reduced pressure gave the crude thioester as a clear oil. Filtration on a silica gel pad (9×11 cm) using a mixture of toluene and ethyl acetate (8:2) as eluent gave 60.3 g (90%) of the title thioester as a clear oil:
IR (NaCl, film) νmax : 2100 (N3) and 1690 cm-1 (C═O of thioester);
1 H NMR (200 MHz, CDCl3) δ: 1.2-1.8 (m, 8H, CH2 -3,4,5 and 6), 2.59 (t, J=7.4 Hz, 2H, CH2 -2), 3.24 (t, J=6.79 Hz, 2H, CH2 -7), 4.25 (s, 2H, SCH2), 7.15 (m, 1H, H-5 of pyridine), 7.33 (d, J=7.8 Hz, 1H, H-3 of pyridine), 7.62 (m, 1H, H-4 of pyridine) and 8.53 ppm (m, 1H, H-6 of pyridine).
D. O-tert-Butyldimethylsilylenol ether of 2-picolyl 7-azidothiolheptanoate ##STR386##
A solution of 2-picolyl 7-azidothiolheptanoate (60.0 g, 0.215 mol) in dry dichloromethane (250 mL) was cooled to -10°C and treated with triethylamine (60.0 mL, 0.43 mmol). Then 74 mL (0.32 mmol) of tert-butyldimethylsilyl trifluoromethanesulfonate was added dropwise over 40 min. The temperature of the mixture was allowed to reach 20°C and the solution was stirred for 3 h. The reaction mixture was then diluted with hexanes (600 mL) and washed with cold water (3×), saturated NaHCO3, brine and dried (MgSO4). Evaporation of the solvent gave the crude silyl enol ether as a dark oil which was used as such for the next step. By 1 H NMR it was a 1:1 mixture of E and Z isomer:
IR (NaCl, film) νmax : 2100 cm-1 (N3);
1 H NMR (200 MHz, CDCl3) δ: 0.2 and 0.23 (2×s, 6H, SiCH3), 0.96 and 0.98 (2×s, 9H, Sit-Bu), 1.2-2.1 (m, CH2 -4,5 and 6), 3.2 (m, 4H, CH2 -3 and 7), 3.95 and 4.03 (2×s, 2H, SCH2), 4.84 and 4.99 (2×t, J=7.22 Hz and J=7.6 Hz, 1H, CH-2), 7.14 (m, 1H, H-5 of pyridine), 7.28 (m, 1H, H-3 of pyridine), 7.61 (m, 1H, H-4 of pyridine) and 8.53 ppm (m, 1H, H-6 of pyridine).
E. (3S,4S)-3-[(1'R)-1'-tert-butyldimethylsilyloxyethyl]-4-[(1"R)-1"-(pyridin- 2-yl)methylthiocarbonyl-6"-(pyridin-2-yl)methylthiocarbonyl-6"-azidohexyl]- azetidin-2-one ##STR387##
To a cold (0°-5°C) suspension of freshly fused zinc chloride (38 g, 0.28 mol) in dry dichloromethane (600 mL) was added 60.0 g (0.208 mmol) of (3S,4R)-4-acetoxy-3-[(1'R)-1'-tertbutyldimethylsilyloxyethyl]azetidin-2-on e followed by a solution of the crude 0-tert-butyldimethylsilylenol ether of 2-picolyl 7-azidothiolheptanoate (0.215 mol) in dichloromethane (125 mL). The reaction mixture was then stirred at 22°C for 18 h. The mixture was then washed successively with water, saturated ammonium chloride, saturated sodium bicarbonate, brine and dried (MgSO4). Evaporation of the solvent under vacuum gave 131 g of the crude thioester as a dark oil which was used as such for the next step. 1 H NMR and HPLC analysis of this mixture indicated a 85:15 mixture of epimers at position 1 of the hexyl (isomer ratio β:α 85:15). Chromatography of an aliquot (4 g) on silica gel (4×20 cm, elution toluene-ethyl acetate, 1:1) gave 1.0 g of the pure title material as an oil followed by mixed fractions (0.25 g) of β and α epimers. Pure β epimer had the following characteristics:
IR (NaCl, film) νmax : 2100 (N3), 1761 (C═O of β-lactam) and 1685 cm-1 (C═O of thioester);
1 H NMR (200 MHz, CDCl3) δ: 0.04 (s, 6H, SiCH3), 0.85 (s, 9H, Si t-Bu), 0.99 (d, J=6.32 Hz, 3H, CH3 CHO), 1.2-1.9 (m, 8H, CH2 -2,3,4 and 5 of hexyl), 2.9 (m, 1H, H-1 of hexyl), 3.03 (m, 1H, H-3), 3.22 (t, J=6.73 Hz, 2H, CH2 N3), 3.79 (dd, JH4,H3 =2.07 Hz, JH4,H1 =7.01 Hz, 1H, H-4), 4.14 (qd, JH,CH3 =6.32 Hz, JH,H3 =3.60 Hz, 1H, CH3 CHO), 5.86 (broad s, 1H, NH), 7.18 (m, 1H, H-5 of pyridine), 7.32 (d, J=7.8 Hz, 1H, H-3 of pyridine), 7.63 (m, 1H, H-4 of pyridine) and 8.54 ppm (m, 1H, H-6 of pyridine).
F. (3S,4S)-3-[(1'R)-1'-tert-Butyldimethylsilyloxyethyl]-4-[(1"R)-1"-carboxy-6 "-azidohexyl]azetidin-2-one ##STR388##
A solution of the crude thioester (∼0.2 mmol) from Step E in tetrahydrofuran (700 mL) was cooled to 0°-5°C and treated dropwise with 150 mL (1.74 mol) of 30% hydrogen peroxide (addition time 15 min). Then 700 mL of 1N sodium hydroxide (2.7 mol) was added dropwise over 1 h. The mixture was allowed to react at 18°C and the solution was stirred for another hour. The mixture was then diluted with hexanes (700 mL) and the aqueous phase was collected, cooled to 0°-5°C and acidified to pH 2.0 with concentrated hydrochloric acid. The aqueous solution was then extracted with ethyl acetate (500 mL and 200 mL). The combined organic phase was washed successively with water, 1M sodium bisulfite, brine and dried (MgSO4). The solvent was then evaporated to a paste which was triturated with hexanes (200 mL). Filtration of the solid gave 16.1 g (19% yield from the acetoxy azetidinone) of the title acid as a white solid. 1 H NMR did not show any α isomer present. Recrystallization from a mixture of ethyl acetate and hexanes gave white plates: mp=145°-147°C (dec); [α]24D -7.1° (c 10, CHCl3).
IR (KBr) νmax : 2100 (N3) and 1715 and 1690 (broad C═O);
1 H NMR (200 MHz, CDCl3) δ: 0.06 and 0.07 (2×s, 2×3H, SiCH3), 0.87 (s, 9H, Si t-Bu), 1.17 (d, J=6.31 Hz, 3H, CH3 CHO) 1.2-1.8 (m, 8H, CH2 -2,3,4 and 5 of hexyl), 2.65 (m, 1H, H-1 of hexyl), 3.13 (broad dd, 1H, H-3), 3.26 (t, J=6.7 Hz, 2H, CH2 N3), 3.86 (dd, JH4,H3 =1.98 Hz, JH4,H1 =6.92 Hz, 1H, H-4), 4.20 (dq, JH,CH3 =6.31 Hz, JH,H3 =4.0 Hz, 1H, CH3 CHO), and 6.34 ppm (s, 1H, NH).
Anal. Calcd. for C18 H34 H4 O4 Si: C 54.24, H 8.60, N 14.06; Found: C 54.18, H 8.54, N 13.91.
G. (3S,4R)-4-[(1"R)-1"-(5-Azidopentyl)-3"-allyloxycarbonyl-2"-oxopropyl]-3-[( 1'R)-1'-tert-butyldimethylsilyloxyethyl]azetidin-2-one ##STR389##
A suspension of (3S,4S)-3-[(1'R)-1'-tert-butyldimethylsilyloxyethyl]-4-[(1"R)-1"-carboxy-6 "-azidohexyl]azetidin-2-one (15.0 g, 37.6 mmol) in dry acetonitrile (350 mL) was treated at 22°C and under nitrogen with 1,1-carbonyldiimidazole (6.7 g, 41.3 mmol). The resulting mixture was stirred for 2 h and the solvent was evaporated under vacuum to give the crude imidazolide as an oil:
IR (NaCl, film) νmax : 2100 (N3), 1760 (C═O of β-lactam) and 1735 cm-1 (C═O of imidazolide).
The crude imidazolide in dry acetonitrile (50 mL) was then added to a solution of magnesium monoallyl malonate (19.0 g, 61.2 mmol) in benzene (300 mL) and the resulting mixture was heated at 65°C for 28 h. The cooled reaction mixture was diluted with ethyl acetate (500 mL), washed successively with water, cold 1N hydrochloric acid, saturated sodium bicarbonate and brine. After drying (MgSO4), evaporation of the solvent gave the crude title material as an oil (∼20 g) which was used as such for the next step. Chromatography of a small aliquot on silica gel (elution toluene-ethyl acetate 8:2) gave the title material as an oil:
IR (NaCl, film) νmax : 2100 (N3), 1760 (C═O of β-lactam), 1715, 1650 and 1630 cm-1 ;
1 H NMR (200 MHz, CDCl3) mixture of keto and enol form in a 1:1 ratio; δ: 0.05 and 0.07 (2s, 6H, SiCH3), 0.87 (s, 9H, Si t-Bu), 1.1 and 1.17 (2d, J=6.31 Hz, and J=6.33 Hz, 3H, CH3 CHO), 1.2-1.8 (m, 8H, CH2 -1,2,3 and 4 of pentyl), 2.2 (m, H-1 of oxopropyl, enol form), 2.9-3.0 (m, H-3 and H-1 of oxopropyl keto form), 3.26 (t, J=6.7 Hz, CH2 N3), 3.54 (s, CH2 -3 of oxopropyl, keto form), 3.8 (m, 1H, H-4), 4.2 (m, 1H, CH3 CHO), 4.8 (m, 2H, CH2 of allyl), 5.07 (s, 1H, H-3 of oxopropyl, enol form), 5.2-5.4 and 5.9-6.1 (2m, 2H and 1H, CH of allyl) and 5.9 ppm (broad s, 1H, NH).
H. (3S,4R)-4-[(1"R)-1"-(5-Azidopentyl)-3"-allyloxycarbonyl-3"-diazo-2"-oxopro pyl]-3-[(1'R)-1'-tert-butyldimethylsilyloxyethyl]azetidin-2-one ##STR390##
A solution of the crude (3S,4R)-4-[(1"R)-1"-(5-azidopentyl)-3"-allyloxycarbonyl-2"-oxopropyl]-3-[( 1'R)-1'-tert-butyldimethylsilyloxyethyl]azetidin-2-one (37.6 mmol) in acetonitrile (100 mL) was treated at 0°-5°C with a solution of p-toluenesulfonyl azide (9.1 g, 46.1 mmol) in acetonitrile (115 mL) followed by triethylamine (6.5 mL, 46.0 mmol). The reaction mixture was then stirred at 22°C for 30 min. The solvent was then evaporated under vacuum and the residue was triturated with a mixture of diethyl ether and hexanes (1:1). The crystalline p-toluenesulfonamide was collected by filtration. The filtrate was concentrated under vacuum to give the title compound as an oil. This product was used as such for the next step. Chromatography of an aliquot on silica gel with a mixture of toluene and ethyl acetate (9:1) gave the pure title material as an oil:
IR (NaCl, film) νmax : 2140 (N2), 2100 (N3), 1760 (C═O of β-lactam), 1720 and 1650 cm-1 ;
1 H NMR (200 MHz, CDCl3) δ: 0.05 and 0.06 (2×s, 6H, SiCH3), 0.86 (s, 9H, Si t-Bu), 1.17 (d, J=6.3 Hz, 3H, CH3 CHO), 1.2-2.0 (m, 8H, CH2 -1,2,3 and 4 of pentyl), 3.03 (broad dd, 1H, H-3), 3.24 (t, J=6.7 Hz, 2H, CH2 N3), 3.84 (dd, JH4,H3 =2.07 Hz, JH4,H-1 =5.37 Hz 1H, H-4) 4.1 (m, 1H, H-1 of oxopropyl), 4.17 (dq, JH,CH3 =6.3 Hz, JH,H3 =3.86 Hz, 1H, CH3 CHO), 4.72 (m, 2H, CH2 of allyl), 5.3-5.4 and 5.9-6.1 (2m, 2H and 1H, CH of allyl) and 5.84 ppm (broad s, 1H, NH).
I. (3S,4R)-4-[(1"R)-1"-(5-Azidopentyl)-3"-allyloxycarbonyl-3"-diazo-2"-oxopro pyl]-3-[(1'R)-1'-hydroxyethyl]azetidin-2-one ##STR391##
A solution of the crude (3S,4R)-4-[(1"R)-1"-(5-azidopentyl)-3"-allyloxycarbonyl-3"-diazo-2"-oxopro py]-3-[(1'R)-1'-tert-butyldimethylsilyloxyethyl]azetidin-2-one (37.6 mmol) in ethanol (250 mL) was treated at 5°C with 100 mL of 1N aqueous hydrochloric acid. After 65 h, the pH of the reaction mixture was adjusted to 6 with sodium bicarbonate and the ethanol was removed under reduced pressure. The residue was diluted with ethyl acetate (500 mL) and the organic phase was washed with water, 0.2M pH 7 phosphate buffer and brine. After drying (MgSO4), the solvent was evaporated under vacuum and the residue was chromatographed on silica gel (9×12 cm, elution with a gradient of ethyl acetate in toluene (1:1) to pure ethyl acetate). Evaporation of the pertinent fractions gave 8.95 (61% for three steps from the carboxylic acid) of the title azetidinone as a solid. Recrystallization from a mixture of diethyl ether and hexanes gave white prisms: mp=65°-66°C; [α]22D -31.2° (c 1.0, CHCl3).
UV (EtOH) λmax : 260 nm (8,440);
IR (KBr) νmax : 2158 (N2), 2100 (N3), 1730 and 1712 (C═O β-lactam and ester) and 1650 cm-1 ;
1 H NMR (200 MHz, CDCl3) δ: 1.29 (d, J=6.3 Hz, 3H, CH3 CHO), 1.2-1.9 (m, 8H, CH2 -1,2,3 and 4 of pentyl), 2.31 (d, J=3.75 Hz, 1H, OH), 2.99 (dd, JH3,H4 =2.0 Hz, JH3,H1 =6.93 Hz, 1H, H-3), 3.25 (t, J=6.7 Hz, 2H, CH2 N3), 3.82 (dd, JH4,H3 =2.0 Hz, JH4,H1 =6.63 Hz, 1H, H-4), 3.95 (m, 1H, H-1 of azidopentyl), 4.11 (m, 1H, CH3 CHO), 4.73 (m, 2H, CH2 of allyl), 5.3-5.4 and 5.9-6.1 (2×m, 2H and 1H, CH of allyl) and 6.0 ppm (broad s, 1H, NH).
Anal. Calcd. for C17 H24 H6 O5 : C 52.09, H 6.16, N 21.42; Found: C 51.85, H 6.04, N 21.33.
J. Allyl (2R,4R,5R,6S)-4-(4"-azidopentyl)-6-[(1'R)-1'-hydroxyethyl]-3,7-dioxo-1-aza bicyclo[3.2.0]heptane-2-carboxylate ##STR392##
A solution of (3S,4R)-4-[(1"R)-1"-(5-azidopentyl)-3"-allyloxycarbonyl-3"-diazo-2"-oxopro pyl]-3-[(1'R)-1'-hydroxyetheyl]azetidin-2-one (2.50 g, 6.37 mmol) in dry benzene (80 mL) was treated under argon with Rhodium (II) octanoate dimer (0.050 g) and heated under reflux (bath temperature 95°C) for 20 min. The solvent was then evaporated under vacuum to give the crude title bicyclic compound as an oil which was used immediately for the next step:
IR (NaCl, film) νmax : 2100 (N3), 1760 (C═O of ⊕-lactam) and 1745 cm-1 (sh C═O of ketoester);
1 H NMR (200 MHz, CDCl3) δ: 1.4 (d, J=6.30 Hz, 3H, CH3 CHO), 1.4-2.0 (m, 8H, CH2 -1, 2, 3 and 4 of pentyl), 2.7 (m, 1H, H-4), 3.2-3.4 (m, 3H, H-6 and CH2 N3), 4.26 (dd, JH5,H6 =2.32 Hz, JH5,H4 =8.06 Hz, 1H, H-5), 4.28 (m, 1H, CH3 CHO), 4.64 (s, 1H, H-2), 4.66 (m, 2H, CH2 of allyl), 5.2-5.4 and 5.8-6.0 ppm (2×m, 2H and 1H, CH of allyl).
K. Allyl (4R,5S,6S)-4-(4"-azidoethyl)-3-[(2-cyanoethyl)thio]-6-[(1'R)-1'-hydroxyeth yl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate ##STR393##
A solution of allyl (2R,4R,5R,6S)-4-(4"-azidopentyl)-6-[(1'R)-1'-hydroxyethyl]-3,7-dioxo-1-aza bicyclo[3.2.0]heptane-2-carboxylate (6.37 mmol) in dry acetonitrile (40 mL) was treated at 0°-5°C and under argon with diphenyl chlorophosphate (1.45 mL, 7.0 mmol) and N,N-diisopropylethylamine (1.22 mL, 7.0 mmol) added simultaneously over 10 min. Then a small crystal of 4-N,N-dimethylaminopyridine was added and the mixture was stirred for 45 min. Then N,N-diisopropylethylamine (2.22 mL, 12.7 mmol) followed by β-mercaptopropionitrile (1.11 g, 12.7 mmol) in acetonitrile (3 mL) were added and the mixture was stirred for 1 h. The reaction mixture was then diluted with ethyl acetate, washed with water, saturated sodium bicarbonate, brine and dried (MgSO4). Evaporation of the solvent gave an oil which was chromatographed on silica gel (5×10 cm). Elution with gradient of ethyl acetate in toluene (8:2 to 7:3) gave 2.52 g (91%) of the title compound as a clear oil.
IR (NaCl, film) νmax : 2258 (CN), 2100 (N3), 1770 (C═O of β-lactam) and 1710 cm-1 (C═O of ester);
1 H NMR (200 MHz, CDCl3) δ: 1.38 (d, J=6.28 Hz, 3H, CH3 CHO), 1.3-1.9 (m, 8H, CH2 -1,2,3 and 4 of pentyl), 1.8 (d, J=4.6 Hz, 1H, OH), 2.7 (∼dt, 2H, CH2 CN), 2.9-3.2 (m, 2H, SCH2), 3.19 (dd, JH6,H5 =2.65 Hz, JH6,H1 =7.34 Hz, 1H, H-6), 3.2 (overlapping with H-6, 1H, H-4), 3.30 (t, J=6.5 Hz, 1H, CH2 N3), 4.24 (overlapping with H-5, 1H, CH3 CHO), 4.26 (dd, JH5,H6 =2.65 Hz, JH5,H4 =9.52 Hz, 1H, H-5), 4.76 (m, 2H, CH2 of allyl), 5.2-5.5 and 5.9-6.1 ppm (2×m, 2H and 1H, CH of allyl).
L. (4R,5S,6S)-4-(5"-Aminopentyl)-3-[(2-cyanoethyl)thio]-6-[(1'R)-1'hydroxyeth yl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR394##
A solution of allyl (4R,5S,6S)-4-(5"-azidopentyl)-3-[(2-cyanoethyl)thio]-6-[(1'R)-1'-hydroxyet hyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate (2.52 g, 5.8 mmol) in dry acetonitrile (125 mL) was treated at 22°C and under argon with tetrakis(triphenylphosphine)palladium [0] (0.13 g) followed by 12.8 mL (6.4 mmol) of a 0.5M solution of potassium 2-ethylhexanoate in ethyl acetate. After 45 min, the reaction mixture was extracted with water (125 mL) and the aqueous phase was maintained under vacuum to remove traces of organic solvent. The aqueous solution was then hydrogenated at 0°-5°C over 4.0 g of 5% palladium over alumina under 45 psi of hydrogen for 1 h (initial pH 7, final pH 11). Then 50 mL of 0.2M pH 6.0 phosphate buffer was added and the catalyst was filtered. The filtrate was concentrated by half under vacuum (T <10°C) and then chromatographed on reversed phase silica gel (μBondapak C18, 3.5×14 cm) using a gradient of acetonitrile (0-5%) in water as eluent. Lyophilization of the UV active fractions gave 1.06 g (49%) of the title carbapenem as a white amorphous solid after freeze drying: [α]22D +52.1° (c 1.0, H2 O).
Purity by HPLC: 99% on μBondapak C18, 3.9mm×30 cm, elution 5% CH3 CN--H2 O, pH 7.4 phosphate buffer, flow rate 1 mLin, uv detector 306 nm, retention time.
UV (water, pH 7.4 phosphate buffer) λmax : 302 nm (9,055);
IR (KBr) νmax : 2255 (CN), 1755 (C═O of β-lactam), and 590 cm-1 (C═O of carboxylate);
1 H NMR (200 MHz, D2 O) δ: 1.33 (d, J=6.35 Hz, 3H, CH3 CHO), 1.3-1.9 (m, 8H, CH2 -1,2,3 and 4 of pentyl), 2.8-3.2 (m, 4H, S CH2 CH2 CN), 3.0 (t, J=7.4 Hz, 2H, CH2 NH2), 3.36 (overlapping with H-6, 1H, H-4), 3.38 (dd, JH6,H5 =2.53 Hz, JH6,H1 =6.30 Hz, 1H, H-6), 4.25 (dd overlapping with CH3 C HO, JH5,H6 =2.53 Hz, 1H, H-5) and 4.27 ppm (m, 1H, CH3 CHO).
(4R,5S,6S)-6-[(1'R)-1'-Hydroxyethyl]-3-[(2-hydroxyethyl)thio]-4-(2"-aminoet hyl)-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR395## A. Allyl (4R,5S,6S)-6-[(1'R)-1'-(tert-butyldimethylsilyloxyethyl)]-3-[(2-hydroxyeth yl)thio]-4-(2"-azidoethyl)-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-3-carboxylat ##STR396##
A cold (0°C) solution of allyl (4R,5S,6S)-6-[(1'R)-1'-(tert-butyldimethylsilyloxyethyl)]-4-(2"-azidoethyl )-3,7-dioxo-1-azabicyclo[3.2.0]heptane-2-carboxylate (0.47 g, 1.08 mmol) in CH3 CN (10 mL) was treated with diphenyl chlorophosphate (0.25 mL, 1.18 mmol) followed by N,N-diisopropylethylamine (0.21 mL, 1.18 mmol) and 4-N,N-dimethylaminopyridine (2 mg). The mixture was stirred at 0° C. for 2 h, under Argon, after which Argon was bubbled through the solution for 15 min. The enol-phosphate was then treated with 2-mercaptoethanol (0.15 mL, 2.15 mmol) in CH3 CN (2 mL) followed by N,N-diisopropylethylamine (0.38 mL, 2.15 mmol) and stirred at 0°C for 1 h and left in cold (5°C) for 16 h. The reaction mixture was diluted with EtOAc (50 mL) and washed successively with cold water, 1M NaHSO3, water, 1N HCl, water, 1M NaHCO3 and brine. The organic phase was dried (MgSO4) and solvent evaporated to a syrup which was chromatographed on silica (3.5×11 cm) packed in CH2 Cl2 and eluted with a mixture of CH2 Cl2 and EtOAc (8:2, gradient elution) to give the title compound as a syrup (0.35 g, 65.5%).
1 H NMR (200 MHz, CDCl3 7.24) δ: 0.06 (s, 6H, Si(CH3)2), 0.87 (S, 9H, SiC(CH3)3, 1.35 (d, 3H, CH3, J=6.3 Hz,), 2.85-3.9 (overlap, 8H, CH2 OH, CH2 N3, H-4, H-6, SCH2), 4.22 (centre m, 2H, H-5, H-1'), 4.6-4.9 (m, 2H, OCH2, allyl), 5.2-5.5 (m, 2H, ═CH2, allyl), 5.86-6.05 (m 1H, CH═allyl).
B. Allyl (4R,5S,6S)-6-[(1'R)-1'-hydroxyethyl]-3-[(2-hydroxyethyl)thio]-4-[2"-azidoe thyl)-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate ##STR397##
A cold (0°C) solution of allyl (4R,5S,6S)-6-[(1'R)-1'-(tert-butyldimethylsilyloxyethyl)]-3-[(2-hydroxyeth yl)thio]-4-(2"-azidoethyl)-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylat e (0.33 g, 0.66 mmol) in dry tetrahydrofuran (5 mL) was treated, under Argon, with acetic acid (0.23 mL, 4 mmol) followed by a 1M solution of tetrabutylammonium fluoride in tetrahydrofuran (1.99 mL, 1.99 mmol). The mixture was stirred between 0° and 5°C for 168 h and then neutralized at 0°C with a 1M NaHCO3 solution (4 mL, 4 mmol). The mixture was extracted with EtOAc (3×50 mL) and the combined organic phase was washed successively with a cold NaHCO3, water and brine, dried (MgSO4) and solvent evaporated to give a sticky foam which was chromatographed on silica (3.5×8 cm) packed in CH2 Cl2 and eluted with a mixture of CH2 Cl2 and EtOAc (0:100, gradient elution) to give the title compound as a foam (0.09 g, 35.4%).
1 H NMR (200 MHz, CDCl3) δ: 1.37 (d, 3H, CH3, J=6.26 Hz), 2.82-3.17 (m, 2H, SCH2), 3.15 (m, 1H, H-6), 3.34-3.64 (overlap, 3H, CH2 N3, H-4), 3.82 (t, 2H, CH2 OH, J=5.43 Hz), 4.22 (m, 1H, H-1'), 4.22 (dd, 1H, H-5, J4,5 =9.64 Hz, J5,6 =2.78 Hz), 4.62-4.87 (m, 2H, OCH2, allyl), 5.21-5.49 (m, 2H, ═CH2, allyl), 5.86-6.05 (m, 1H, CH═, allyl).
C. (4R,5S,6S)-6-[(1'R)-1'-Hydroxyethyl]-3-[(2-hydroxyethyl)thio]-4-[2"-aminoe thyl)-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR398##
To a cold (0°C) solution of allyl (4R,5R,6S)-6-[(1'R)-1'-hydroxyethyl]-3-[(2-hydroxyethyl)thio]-4-(2"-azidoe thyl)-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate (0.09 g, 0.24 mmol) in CH2 Cl2 (10 mL), under Argon, was added Pd[Ph3 P]4 (0.04 g, 0.035 mmol) followed by a 0.5M solution of 2-ethylhexanoate in EtOAc (0.52 mL, 0.26 mmol). The mixture was stirred at 0°C for 1 h, diethyl ether (50 mL) was added and extracted with water (3×25 mL). To the combined aqueous extract was added a 0.05M solution of pH 7.0 phosphate buffer (10 mL) and was hydrogenated at 0°C over 5% palladium on alumina (0.3 g) at 40 psi for 2 h. The catalyst was filtered, washed with water and the combined filtrate was passed through a column of μBondapak C18 reverse phase silica (3.5×9 cm). Appropriate fractions corresponding to the product were lyophilized to a solid which was rechromatographed on μBondapak C18 reverse phase silica (3.5×9 cm). The compound was eluted with water and was obtained as a pale yellow fluffy solid after lyophilization (0.021 g, 28.2%).
Purity by HPLC: 93.9% with UV detection at 302 nm on μBondapak C18 (4 mm×30 cm); pH 6.8 phosphate buffer; flow rate 1 mLin; retention time: 3.89 min.
UV λmax : 302 nm.
IR (Nujol): νmax : 1750 cm-1 (C═O, β-lactam);
1 H NMR (200 MHz, D2 O) δ: 1.33 (d, 3H, CH3, J=6.37 Hz) 1.82-1.98; 2.1-2.27 (m, 2H, CH2), 2.79-3.23 (overlap, 4H, CH2 NH2, SCH2), 3.44 (centre m, 2H, H-4, H-6), 3.76 (m, 2H CH2 OH, J=6.24 Hz) 4.26 (dd, 1H, H-5 J4,5 =9.14 Hz J5,6 =2.56 Hz), 4.28 (m, 1H, H-1').
(4R,5S,6S)-3-[(2-Cyanoethyl)thio]-6-[(1'R)-1'-hydroxyethyl]-4-[2"-(1-N-meth ylpyrrolidinium)ethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate ##STR399##
A solution of (4R,5S,6S)-3-[(2-cyanoethyl)thio]-6-[(1'R)-1'-hydroxyethyl]-4-[2"-(1-pyrro lidinyl)-ethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid (0.150 g, 0.39 mmol) [prepared in Example 63] in a mixture of water (8 mL), acetonitrile (4 mn) and dioxane (5 mL) at 0°-5°C was adjusted to pH 9.5 with 1M sodium hydroxide. Then dimethyl sulfate (0.22 mL) was added all at once and the pH was maintained at 9-9.5 for 35 min. Then 20 mL of 0.2M pH 6.0 phosphate buffer was added and the solution was maintained under vacuum to remove the organic solvent. The aqueous solution was chromatographed twice on reversed phase silica gel (μBondapak C18, 2.5×13 cm) using a gradient of acetonitrile (0-5%) in water as eluent. Lyophilization of the UV active fractions gave 0.056 g (36%) of the pyrrolidinium title compound as a white amorphous solid: [α]22D +57.0° (c 1.0, H2 O);
Purity by HPLC: 99% on μBondapak C18, 3.9 mm×30 cm, elution 5% CH3 CN--H2 O, pH 7.4 phosphate buffer, flow rate 1 mL/min, uv detector 300 nm, retention time 6.24 min.
UV (water, pH 7.4 phosphate buffer) λmax : 298 nm (6,660);
IR (KBr) νmax : 2250 (CN), 1760 (C═O of β-lactam) and 1600 cm-1 (C═O of carboxylate);
1 H NMR (200 MHz, D2 O) δ: 1.34 (d, J=6.35 Hz, 3H, CH3 CHO), 2.0-2.4 (m, 6H, CH2 -1 of ethyl and CH2 -3,3' of pyrrolidine), 2.8-3.2 (m, 4H, S CH2 C H2 CN), 3.11 (s, 3H, NCH3), 3.4-3.7 (m, 8H, H-4, H-6, CH2 -2 of ethyl and CH2 -2,2' of pyrrolidine), 4.28 (m, 1H, CH3 CHO) and 4.31 ppm (dd, JH5,H6 =3.01 Hz, JH5,H4 =9.0 Hz, 1H, H-5).
(4R,5S,6S)-3-[(2-Cyanoethyl)thio]-4-[2"-[N,N-(2-cyanoethyl)methylamino]ethy l]-6-[(1'R)-1'-hydroxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxyl ic acid ##STR400## A. Allyl (4R,5S,6S)-6-[(1'R)-1'-tert-butyldimethylsilyloxyethyl]-3-[(2-cyanoethyl)t hio]-4-[2"-[N,N-(2-cyanoethyl)methylamino]ethyl]-7-oxo-1-azabicyclo[3.2.0]h ept-2-ene-2-carboxylate ##STR401##
A cold (dry ice-acetone) solution of allyl (4 R,5 S,6 S)-6[(1' R)-1'- tert-butyldimethylsilyloxyethyl]-3-[(2-cyanoethyl)thio]-4-(2"-hydroxyethyl )-7-oxo-1-azabicyclo[3.2.0]hept-2-ene2-carboxylate (400 mg, 0.830 mmol) in dichloromethane (10 mL) was treated first with diisopropylethylamine (0.380 mL, 2.16 mmol) and then dropwise with trifluoromethanesulfonic anhydride (0.17 mL, 1.0 mmol). The mixture was stirred for 25 min, treated with N-methyl-β-alaninenitrile (0.23 mL, 2.5 mmol) in dichloromethane (0.5 mL) and then stirred for 3 h at -15°C (dry ice bath replaced by ice-methanol bath). The mixture was allowed to stand in the cold room (5°C) for 18 h, then diluted with ethyl acetate (20 mL), washed with ice cold 1M aqueous NaHCO3 (5 mL), ice cold water (5 mL), brine (5 mL) and dried (MgSO4). The residue was passed through a silica gel flash pad (15 g, 30→80% ethyl acetateexane) to give title compound (315 mg, 69%) as a pale yellow oil.
IR (CH2 CL2) νmax : 2250 (CN), 1775 (C═O β-lactam) and 1715 cm-1 (C═O);
1 H NMR (CDCl3, 200 MHz) δ: 6.03-5.86 (1H, m, vinylic H), 5.486-5.224 (2H, m, vinylic H), 4.851-4.666 (2H, m, allylic CH2), 4.29-4.18 (1H, m, H-1'), 4.197, 4.184 (d, J=2.6 Hz, part of H-5), 3.541-3.450 (1H, m, H-4), 3.380-3.242, 3.069-2.929 (2H, 2 sets of m, SCH2), 3.110 (1H, dd, J=2.4 Hz, J=7.0 Hz, H-6), 2.807-2.315 (SH, m, CH2 N and CH2 CN), 2.315 (3H, s, NCH3), 2.04-1.87, 1.70-1.55 (2H, 2 sets of m, CH2 -4), 1.30 (3H, d, J=6.1 Hz, CH3), 0.895 (9H, s, tert-butyl) and 0.096 ppm (6H, s, dimethyl).
B. Allyl (4R,5R,6S)-3-[(2-cyanoethyl)thio]-4-[2"-[N,N-(2-cyanoethyl)methylamino]eth yl]-6-[(1'R)-1'-hydroxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxy late ##STR402##
A cold (ice-methanol bath) solution of allyl (4 R,5 S,6 S)-6-[(1' R)-1'- tert-butyldimethylsilyloxyethyl]-3-[(2-cyanoethyl)thio]-4-[2"-[N,N-(2-cyan oethyl)methylamino]ethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate (305 mg, 0.560 mmol) in tetrahydrofuran (5 mL) was treated with glacial acetic acid (0.18 mL, 3.4 mmol) and dropwise with a 1M solution of tetrabutylammonium fluoride in tetrahydrofuran (1.68 mL, 1.68 mmol). The mixture was allowed to stand in the cold room for 8 days, then diluted with ethyl acetate (25 mL), washed with ice cold 1M aqueous NaHCO3 (3×5 mL), water (2×5 mL), brine (5 mL) and dried (MgSO4). The residue was passed through a silica gel flash pad (6 g, 40%→100% ethyl acetateexane, 1/1 ethyl acetate/acetone) to give title compound (195 mg, 80%) as an oil.
IR (CH2 Cl2) νmax : 3600, 3500 (OH), 2250 (CN), 1775 (C═Oβ-lactam) and 1710 cm-1 (C═O);
1 H NMR (CDCl3, 200 MHz) δ: 6.04-5.85 (1H, m, vinylic H), 5.494-5.238 (2H, m, vinylic H), 4.9-4.70 (2H, m, allylic H), 4.282 (1H, dd, J=2.6 Hz, J=9.6 Hz, H-5), 4.29-4.13 (1H, m, H-1'), 3.80-3.70 (1H, m, H-4), 3.35-3.20, 3.05-2.90 (2H, 2 sets of m, SCH2), 3.152 (1H, dd, J=2.6 Hz, J=8.8 Hz, H-6), 2.8-2.6 (4H, m, CH2 CN), 2.6-2.45 (2H, m, CH2 N), 2.1-1.9, 1.7-1.5 (2H, 2 sets of m, CH2 -4), 1.60 (1H, bs, OH) and 1.404 ppm (3H, d, J=6.2 Hz, CH3).
C. (4R,5S,6S)-3-[(2-Cyanoethyl)thip]-4-[2"-[N,N-(2-cyanoethyl)methylamino]eth yl]-6-[(1'R)-1'-hydroxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxy lic acid ##STR403##
A cold (ice bath) solution of allyl (4 R,5 S,6 S)-3-[(2-cyanoethyl)thio]-4-[2"-[N,N-(2-cyanoethyl)methylamino]ethyl]-6-[( 1' R)-1'-hydroxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate (195 mg, 0.45 mmol) in dichloromethane (12 mL) was treated with Pd(Ph3)4 (42 mg, 0.034 mmole) and dropwise with a 0.5M solution of potassium 2-ethylhexanoate in ethyl acetate 0.90 mL, 0.45 mmol). The mixture was stirred for 30 min, the diluted with diethyl ether and extracted with a 0.04M aqueous phosphate buffer (3×15 mL) and water (2×15 mL). The aqueous extracts were combined, washed with diethyl ether (2×10 mL) and passed through a μBondapak C18 reversed phase column (150 g, 0→3% CH3 CN2 O) to give title compound (127 mg, 72%) as a lyophilized powder.
Purity: 99.2% as determined by HPLC (r.t.=7.89 min, μBondapak C18, 10 μ, 5% CH3 CN/KH2 PO4 0.01M, pH 7.4);
UV (H2 O) λmax : 300 (7887);
IR (Nujol) νmax : 3600-3100 (OH), 2250 (CN), 1745 (C═O β-lactam) and 1595 cm-1 (C═O);
1 H NMR (D2 O, 200 MHz) δ: 4.35-3.25 (2H, m, H-1'and H-5), 3.404 (1H, dd, J=2.6 Hz, J=6.3 Hz, H-6), 3.42-3.30 (1H, m, H-4), 3.25-3.1, 3.03-2.9 (2H, 2 sets of m, SCH2), 2.87-2.81 (4H, m, CH2 N), 2.75-2.65, 2.62-2.54 (4H, 2 sets of 3 lines, CH2 CN), 2.328 (3H, s, N--CH3), 2.15-1.95, 1.8-1.6 (2H, 2 sets of m, CH2 -4) and 1.341 ppm (3H, d, J=6.3 Hz, CH3).
(4R,5S,6S)-4-[2"-(1-N-Azetidino)ethyl]-3-[(2-cyanoethyl)thio]-6-[(1'R)-1'-h ydroxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR404## A. Allyl (4R,5S,6S)-6-[(1'R)-1'-tert-butyldimethylsilyloxyethyl]-4(2"-tert-butyldim ethylsilyloxyethyl)-3-[(2-cyanoethyl)thio]-7-oxo-1-azabicyclo[3.2.0]hept-2- ene-2-carboxylate ##STR405##
A solution of allyl (2R,4R,5R,6S)-6-[(1'R)-1'-tert-butyldimethylsilyloxyethyl]-4-(2"-tert-buty ldimethylsilyloxyethyl)-3,7-dioxo-1-azabicyclo[3.2.0]heptane-2-carboxylate (27.2 mmol, prepared by cyclization of 15.08 g, 27.2 mmol of the diazo precursor) in dry acetonitrile (200 mL) was treated at 0°-5° C. and under nitrogen with diphenyl chlorophosphate (6.3 mL, 30.4 mmol) and N,N-diisopropylethylamine (5.0 mL, 28.7 mmol) added simultaneously over 5 min. A small crystal of 4-N,N-dimethylaminopyridine was then added and the mixture was stirred for 1 h. More N,N-diisopropylethylamine (9.5 mL, 54.5 mmol) followed by β-mercaptopropionitrile (4.6 g, 53.8 mmol) in acetonitrile (10 mL) were added dropwise and the resulting mixture was stirred for 30 min.
The reaction mixture was then diluted with ethyl acetate (1 L), washed with cold water, saturated sodium bicarbonate, 0.2M pH 7.0 phosphate buffer, brine and dried (MgSO4). The solvent was evaporated under reduced pressure and the residue was chromatpgraphed over silica gel (7.5×11 cm) using a gradient of ethyl acetate (0-5%) in toluene as eluent. Evaporation of the UV active fractions gave 11.19 g (69%) of the title material as an oil which solidified upon standing. Recrystallization from hexanes gave the title compound as long needles: mp=95°C; [α]22D +48.9° (c 1.0, CHCl3).
UV (EtOH) λmax : 318 nm (11,930);
IR (KBr) νmax : 1770 (C═O of β-lactam) and 1700 cm-1 (C═O of ester);
1 H NMR (200 MHz, CDCl3) δ: 0.08 and 0.09 (2s, 3H and 9H, SiCH3), 0.89 and 0.91 (2s, 2×9H, Si-tBu), 1.27 (d, J=6.15 Hz, 3H, CH3 CHO), 1.6-2.1 (m, 2H, CH2 -4), 2.67 (∼t, 2H, CH2 CN), 2.9-3.1 and 3.2-3.4 (2m, 2H, SCH2), 3.10 (dd, JH6,H5 =2.52 Hz, JH6,H1 =6.26 Hz, 1H, H-6), 3.45-3.65 and 3.75-3.9 (2m, 2H and 1H, H-4 and CH2 OSi), 4.21 (dd overlapping with CH3 CHO, JH5,H6 =2.52 Hz, 1H, H-5), 4.24 (m, 1H, CH3 CHO), 4.74 (m, 2H, CH2 of allyl), 5.2-5.5 and 5.9-6.1 ppm (2m, 2H and 1H, CH of allyl).
Anal. Calcd. for C29 H50 N2 O5 SSi2 : C 58.55, H 8.47, N 4.71, S 5.39; Found: C 58.45, H 8.37, N 4.73, S 5.24.
B. Allyl (4R,5R,6S)-6-[(1'R)-1'-tert-butyldimethylsilyloxyethyl]-3-[(2-cyanoethyl)t hio]-4-(2"-hydroxyethyl)-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate ##STR406##
A solution of allyl (4R,5S,6S)-6-[(1'R)-1'-tert-butyldimethylsilyloxyethyl]-4-(2"-tert-butyldi methylsilyloxyethyl)-3-[(2-cyanoethyl)thio]-7-oxo-1-azabicyclo[3.2.0]hept-2 -ene-2-carboxylate (11.19 g, 18.8 mmol) in tetrahydrofuran (250 mL) was treated at 0°-5°C and under nitrogen with acetic acid (6.5 mL, 0.113 mol) followed by 56 mL (56.0 mmol) of a 1.0M solution of tetrabutylammonium fluoride in tetrahydrofuran. The solution was then stored at 10°C for 18 h. The reaction mixture was then diluted with ethyl acetate (1 L), washed with cold saturated sodium bicarbonate, brine and dried (MgSO4). Evaporation of the solvent under reduced pressure gave an oil which was chromatographed on silica gel (7.5×12 cm). Elution with a gradient of ethyl acetate in toluene (3:7 to 1:1) gave 6.80 g (75%) of the title compound as a thick glass:
IR (NaCl, film) νmax : 3500 (OH), 2260 (CN), 1775 (C═O of β-lactam) and 1710 cm-1 (C═O of ester);
1 H NMR (200 MHz, CDCl3) δ: 0.09 (s, 6H, SiCH3), 0.89 (s, 9H, Si-tBu), 1.29 (d, J=6.13 Hz, 3H, CH3 CHO), 1.6-2.1 (m, 2H, CH2 -4), 2.70 (∼t, 2H, CH2 CN), 2.95-3.1 and 3.2-3.4 (2m, 2H, SCH2), 3.18 (dd, JH6,H5 =2.63 Hz, JH6,H1 =7.02 Hz, 1H, H-6), 3.54 (broad t, 1H, H-4), 3.6-4.0 (m, 2H, CH2 OH), 4.15-4.3 (m, 2H, H-5 and CH3 CHO overlapping), 4.75 (m, 2H, CH2 of allyl), 5.2-5.5 and 5.9-6.1 ppm (2m, 2H and 1H, CH of allyl).
C. Allyl (4R,5S,6S)-4-(2"-(1-N-azetidino)ethyl]-6-[(1'R)-1'-tert-butyldimethylsilyl oxyethyl]-3-[(2-cyanoethyl)thio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carb oxylate ##STR407##
A solution of allyl (4R,5R,6S)-6-[(1'R)-1'-tert-butyldimethylsilyloxyethyl]-3-[(2-cyanoethyl)t hio]-4-(2"-hydroxyethyl)-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate (1.07 g, 2.22 mmol) in dry dichloromethane (18 mL) was cooled to -78°C and treated under nitrogen with N,N-diisopropylethylamine (0.57 mL, 3.27 mmol) followed by trifluoromethanesulfonic anhydride (0.39 mL, 2.31 mmol) dropwise over 5 min. After 30 min at -78°C, more N,N-diisopropylethylamine (0.57 mL, 3.27 mmol) was added followed by azetidine (0.18 mL, 2.67 mmol) dropwise over 5 min. The reaction mixture was stirred at -78°C for 30 min, slowly warmed up to -20° C. over 30 min and stirred at this temperature for 1 h. The reaction mixture was then quenched by addition to a cold mixture of ethyl acetate (200 mL) and water (20 mL). The organic phase was washed with brine (2×20 mL), dried (MgSO4) and evaporated under reduced pressure. The residue was chromatographed on silica gel (3.5×12 cm) using acetone as eluent. Evaporation of the UV active fractions gave 0.639 g (55%) of the title compound as an oil. By TLC and 1 H NMR this material contained 25% of a product resulting from the opening of the β-lactam by the azetidine.
IR (NaCl, film)νmax : 2255 (CN), 1775 (C═O of β-lactam), 1712 (C═O of ester), and 1645 (amide of the open product);
1 H NMR (200 MHz, CDCl3) δ: 0.08 (s, 6H, SiCH3), 0.88 (s, 9H, Si-tBu), 1.29 (d, J=6.13 Hz, 3H, CH3 CHO), 1.4-1.8 (m, 2H, CH2 -4), 2.07 (m, 2H, CH2 -3 of azetidine), 2.69 (∼t, 2H, CH2 CN), 2.9-3.5 (broad m, 10H, CH2 -2 and 4 of azetidine, CH2 -2 of ethyl, H-4 and H-6 and SCH2), 4.15 (dd, JH5,H6 =2.55 Hz, JH5,H6 =9.45 Hz 1H, H-5) 4 17 (m, 1H, CH3 CHO), 4.73 (m, 2H, CH2 of allyl), 5.2-5.5 and 5.9-6.1 ppm (2m, 2H and 1H, CH of allyl).
D. Allyl (4R,5S,6S)-4-[2"-(1-N-azetidino)ethyl]-3-[(2-cyanoethyl)thio]-6-[(1'R)-1'- hydroxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate ##STR408##
A solution of allyl (4R,5S,6S)-4-[2"-(1-N-azetidino)ethyl]-6-[(1'R)-1'-tert-butyldimethylsilyl oxyethyl]-3-[(2-cyanoethyl)thio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carb oxylate (0.639 g, 1.23 mmol) in dry tetrahydrofuran (8 mL) was cooled to -15°C and treated under nitrogen with acetic acid (0.42 mL, 3.7 mmol) followed by 3.7 mL (3.7 mmol) of a 1M solution of tetrabutylammonium fluoride in tetrahydrofuran. The solution was then stirred at 0°C for 140 h. Then 1.2 g of solid powdered sodium bicarbonate was added and the mixture was stirred for 10 min. The organic phase was then chromatographed on silica gel (3.5×3.5 cm) using a mixture of acetone and N,N-dimethylformamide (9:1) as eluent. Evaporation of the pertinent fractions gave 0.39 g (78%) of the title material as an oil. By 1 H NMR this material was about 50% pure and contained some N,N-dimethylformamide and some tetrabutylammonium salt. This product was used as such for the next step.
IR (NaCl, film) νmax : 2250 (CN), 1775 (C═O of β-lactam) and 1710 cm-1 (C═O of ester);
1 H NMR (200 MHz, CDCl3) δ: 1.39 (d, J=6.31 Hz, 3H, CH3 CHO), 1.7 (m, 2H, CH2 -4), 2.27 (m, 2H, CH2 -3 of azetidine), 2.67 (∼t, 2H, CH2 CN), 2.9-3.2 (m, 2H, SCH2), 3.2-3.4 (m, 4H, H-4, H-6 and CH2 -2 of ethyl), 3.58 (t, J=7.6 Hz, CH2 -2 and 4 of azetidine), 4.10 (dq, JH5,H6 =6.31 Hz, JH,H6 =8.86 Hz, 1H, CH3 CHO), 4.28 (dd, JH5,H6 =3.12 Hz, JH5,H4 =10.26 Hz, 1H, H-5), 4.75 (m, 2H, CH2 of allyl), 5.2-5.5 and 5.9-6.1 ppm (2m, 2H and 1H, CH of allyl).
E. (4R,5S,6S)-3-[2"-(1-N-Azetidino)ethyl]-3-[(2-cyanoethyl)thio]-6-[(1'R)-1'- hydroxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR409##
A solution of crude allyl (4R,5S,6S)-4-[2"-(1-N-azetidino)ethyl]-3-[(2-cyanoethyl)thio]-6-[(1'R)-1'- hydroxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate (0.39 g, 0.96 mmol) in ethyl acetate (15 mL) was treated at 22°C and under nitrogen with tetrakis(triphenylphosphine)palladium [0] (0.050 g) and 3 mL (1.5 mmol) of a 0.5M solution of potassium 2-ethylhexanoate in ethyl acetate. After 30 min, the reaction mixture was extracted with water (30 mL and 20 mL) and the combined extract was maintained under vacuum to remove traces of organic solvent. Then 8 mL of 0.2M pH6 phosphate buffer were added and the solution was chromatographed on reversed phase silica gel (μBondapak C18, 3×13 cm) using a gradient of acetonitrile (0-5%) in water as eluent. The UV active fractions were combined lyophilized and chromatographed a second time on the same column. Final lyophilization gave 0.065 g (19%) of the title carbapenem as a white amorphous powder:
Purity by HPLC: 99.4% on μBondapak C18, 3.9 mm×30 cm, elution 5% CH3 CN--H2 O pH 7.4 phosphate buffer, flow rate 1 mLin, uv detector 300 nm, retention time 6.41 min,;
UV (H2 O, pH 7.4 phosphate buffer) λmax : 298 nm (8,422);
IR (KBr) νmax : 2250 (CN), 1760 (C═O of β-lactam) and 1600 cm-1 (C═O of carboxylate);
1 H NMR (200 MHz, D2 O) δ: 1.33 (d, J=6.38 Hz, 3H, CH3 CHO), 1.7-2.2 (m, 2H, CH2 -4), 2.52 (m, 2H, CH2 -3 of azetidine), 2.85 (m, 2H, CH2 CN), 2.85-3.2 (m, 2H, SCH2), 3.2-3.5 (m, 3H, CH2 -2 of ethyl and H-4), 3.41 (dd overlapping with CH2 -2 of ethyl, JH6,H5 =2.70 Hz, JH6,H1 =6.86 Hz, 1H, H-6), 4.17 (m, 4H, CH2 -2 and 4 of azetidine), and 4.2-4.35 ppm (m, 2H, H-5 and CH3 C HO).
(4R, 5S,6S)-3-[(2-Cyanoethyl)thio]-6-[(1'R)-1'-hydroxyethyl]-4-[2"(4-methylpipe razine-1-yl) ethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR410## A. Allyl (4R,5S,6S)-6-[(1'R)-1'-tert-butyldimethylsilyloxyethyl]-3-[(2-cyanoethyl)t hio]-4-[2"-(4-methylpiperazine-1-yl)ethyl]-7-oxo-1-azabicylo[3,2.0]hept-2-e ne-2-carboxylate ##STR411##
A solution of allyl (4R,5S,6S)-6-[(1'R)-1'-tert-butyldimethylsilyloxyethyl]-3-[(2-cyanoethyl)t hio]-4-[2"-(4-methylpiperazine-1-yl)ethyl]-7-oxo-1-azabicyclo[3.2∅]hept-2 -ene-2-carboxylate (1.0 g, 2.08 mmol) in dry dichloromethane (20 mL) was cooled to -78°C and treated under nitrogen with N,N-diisopropylethylamine (0.54 mL, 3.1 mmol) followed by trifluoromethanesulfonic anhydride (0.40 mL, 2.38 mmol) dropwise over 5 min. After 20 min at -78°C, 1-methylpiperazine (1.0 mL, 9.01 mmol) was added dropwise and the resulting solution was slowly warmed to -20°C and stirred at that temperature for 1.5 h. The reaction was then quenched by addition of cold ethyl acetate (200 mL) and water. The organic phase was washed with water, brine and dried (MgSO4). Evaporation of the solvent under reduced pressure gave 1.4 g of a clear oil which was used as such for the next step. By 1 H NMR this product was contaminated by some 1-methylpiperazine.
IR (NaCl, film) νmax : 2260 (CN), 1775 (C═O of β-lactam) and 1710 cm-1 (C═O of ester);
1 H NMR (200 MHz, CDCl3) δ: 0.08 (s, 6H, SiCH3), 0.88 (2, 9H, Si-tBut), 1.28 (d, J=6.05 Hz, 3H, CH3 CHO), 1.5-2.0 (m, 2H, CH2 -4), 2.3 (s, 3H, NCH3), 2.3-2.6 (m, 10H, CH2 -2 of ethyl and CH2 of piperazine), 2.6-2.8 (m, 2H, CH2 CN), 2.9-3.1 and 3.2-3.4 (m, 2H, SCH2), 3.19 (dd, JH6,H5 =2.37 Hz, JH6,H1 =6.6 Hz, 1H, H-6), 3.3 (m, 1H, H-4), 4.19 (dd overlapping with CH3 CHO, JH5,H6 =2.37 Hz, 1H, H-5), 4.22 (m, 1H, CH3 CHO), 4.73 (m, 2H, CH2 of allyl), 5.2-5.5 and 5.9-6.1 ppm (2×m, 2H and 1H, CH of allyl).
B. Allyl (4R,5S,6S)-3-[(2-cyanoethyl)thio]-6-[(1'R)-1'-hydroxyethyl]-4-[2"-(4-methy lpiperazine-1-yl)ethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate ##STR412##
A solution of allyl (4R,5S,6S)-6-[(1'R)-1'-tert-butyldimethylsilyloxyethyl]-3-[(2-cyanoethyl)t hio]-4-[2"-(4-methylpiperazine-1-yl)ethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2- ene-2-carboxylate (1.17 g, 2.08 mmol) in dry tetrahydrofuran (50 mL) was cooled to -20°C, and treated dropwise under nitrogen with acetic acid (1.55 mL, 27.1mmol) followed by 14.6 mL (14.6 mmol) of a 1M solution of tetrabutylammonium fluoride in tetrahydrofuran. The solution was then stored at 10°C for 7 days. The reaction mixture was then diluted with ethyl acetate (300 mL), washed with cold saturated sodium bicarbonate, brine and dried (MgSO4). Evaporation of the solvent under reduced pressure gave 1.45 g of the crude carbapenem. Chromatography on silica gel (3.5×6 cm) using a mixture of acetone and N,N-dimethylformamide (9:1) gave 0.57 g (61%, for two steps) of the title carbapenem as an oil. By 1 H NMR, this material contained one equivalent of N,N-dimethylformamide.
IR (NaCl, film) νmax : 2250 (CN), 1770 (C═O of β-lactam) and 1710 cm-1 (C═O of ester);
1 H NMR (200 MHz, CDCl3) δ: 1.38 (d, J=6.24 Hz, 3H, CH3 CHO), 1.6-2.0 (m, 2H, CH2 -4), 2.29 (s, 3H, NCH3), 2.3-2.8 (m, 12H, CH2 of piperazine, CH2 -2 of ethyl and CH2 CN), 2.9-3.1 and 3.2-3.4 (m, 2H, SCH2), 3.24 (dd overlapping with SCH2, JH6,H5 =2.7 Hz, JH6,H1 =6.9 Hz, 1H, H-6), 3.42 (m, 1H, H-4), 4.23 (m, 1H, CH3 CHO), 4.28 (dd, JH5,H6 =2.7 Hz, JH5,H4 =9.5 Hz, 1H, H-5) 4.76 (m 2H CH2 of allyl), 5.2-5.5 and 5.9-6.1 ppm (2×m, 2H and 1H, CH of allyl).
C. (4R,5S,6S)-3-[(2-Cyanoethyl)thio]-6-[(1'R)-1'-hydroxyethyl]-4-[2"-(4-methy lpiperazine-1-yl)ethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR413##
A solution of allyl (4R,5S,6S)-3-[(2-cyanoethyl)thio]-6-[(1'R)-1'-hydroxyethyl]-4-[2"-(4-methy lpiperazine-1-yl)ethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate (0.57 g, 1.27 mmol) in dry ethyl acetate (25 mL) was treated at 22° C. and under nitrogen with tetrakis (triphenylphosphine) palladium [0] (0.075 g) followed by 2.8 mL (1.4 mmol) of a 0.5M solution of potassium 2-ethylhexanoate in ethyl acetate. After 45 min, the reaction mixture was extracted successively with 50 mL of a 0.1M pH 6.0 phosphate buffer and 25 mL of water. The combined aqueous phase was maintained under vacuum to remove traces of organic solvent and then chromatographed twice on reversed phase silica gel (μ-Bondapak C18, 2.5×14 cm). Elution with a gradient of acetonitrile (0-5%) in water gave 0.28 g (54%) of the title carbapenem as a white amorphous powder after freeze drying: [α]22D +35.3° (c 1.0, H2 O).
Purity by HPLC: 97% on μ-Bondapak C18, 3.9 mm×30 cm, elution 10% CH3 CN--H2 O Ph 7.4 phosphate buffer flow rate 1 mLin, uv detector 302 nm, retention time 6.6 min;
UV (H2 O, pH 7.4 phosphate buffer) λmax : 300 nm (8,39O);
IR (KBr) νmax : 2250 (CN), 1755 (C═O of β-lactam) and 1595 cm-1 (C═O of carboxylate);
1 H NMR (200 MHz, D2 O) δ: 1.33 (d, J=6.39 Hz, 3H, CH3 CHO), 1.6-2.2 (m, 2H, CH2 -4), 2.75 (s, 3H, NCH3), 2.6-3.3 (m, 12H, CH2 of piperazine, SCH2 and CH2 -2 of 4-ethyl), 3.3-3.5 (m, 2H, H-4 and H-6 overlapping) and 4.2-4.4 ppm (m, 2H, H-5 and CH3 CHO).
(4R,5S,6S)-4-(3"-Guanidinopropyl)-6-[(1'R)-1'-hydroxyethyl]3-[(2-(1-pyrroli dinyl)ethyl]thio)-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid, acetic acid salt ##STR414##
A cold (ice bath) solution of (4 R,5 S,6 S)-4-(3"-aminopropyl)-6-[(1' R)-1'-hydroxyethyl]-3-([2-(1-pyrrolidinyl)ethyl]thio)-7-oxo-1-azabicyclo[3 .2.0]hept-2-ene-2-carboxylic acid (from hydrogenolysis of the corresponding azido derivative 115 mg, 0.270 mmol) in a 0.05M aqueous phosphate buffer (15 mL) was treated with 0.1N aqueous NaOH to raise and maintain the pH at 8.0-8.2 during the portionwise addition of aminoiminomethanesulfonic acid (170 mg, 1.30 mmol). The mixture was stirred for 3 h (pH maintained between 8-8.2), then was neutralized with 0.1 Maqueous NaH2 PO4. It was passed through a μBondapak C18 reversed phase column (20 g, 0.005M aqueous acetic acid, 1→2% CH3 CNB 0.005M aqueous acetic acid) to give the title compound (75 mg, 57%) as a white lyophilized powder.
Purity: 98.07% as determined by HPLC (r.t.=8.86 min, μBondapak C18, 10M, 20% CH3 CN/KH2 PO4 0.01M, pH 7.4);
UV (water) λmax : 296 (6723);
IR (Nujol) νmax : 3400-3100 (OH, NH2), 1760 (C═O of β-lactam), 1670, 1635 (C═N), and 1485 cm-1 (C═O of carboxylate);
1 H NMR (D2 O, 200 MHz), δ: 4.35-4.23 (1H, m, H-1'), 4.264 (1H, dd, J=3.1 Hz, J=9.8 Hz, H-5), 3.399, 3.384 (d, J=3.1 Hz, part of H-6), 3.40-3.138 (11H, m, H-4 (C H2 --NH, S--C H2 C H2 N, C H2 --N--C H2 and part of H-6), 2.12-2.05 (4H, (CH2)2 pyrrolidine), 1.919 (1.5H, s, CH3 CO2), 1.95-1.4 (2 sets of m, CH2 CH2 at position 4) and 1.320 ppm (3H, d, J=6.4 Hz, CH3).
(4R,5S,6S)-4-(3"-Aminopropyl)-3-[(2-N,N-dimethylaminoethyl)thio]-6-[(1'R)-1 '-hydroxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid, acetic acid salt ##STR415## A. Allyl (4R,5S,6S)-4-(3"-azidopropyl)-3-[(2-N,N-dimethyl aminoethyl)thio]-6-[(1'R)-1'-hydroxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2 -ene-2-carboxylate ##STR416##
To a cold (dry ice-acetone bath) solution of allyl (4 R,5 S,6 S)-4-(3"-azidopropyl)-3-[(2-N,N-dimethyl aminoethyl)thio]-6-[(1' R)-1'-triethylsilyloxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxy late (3.29 g, 6.45 mmol) in CH2 Cl2 (60 mL) was added N,N-diisopropylethylamine (2.90 mL, 16.8 mmol) followed by the dropwise addition of trifluoromethanesulfonic anhydride (1.29 mL, 7.7 mmol). After a 20 min stirring period, a stream of gaseous dimethyl amine was passed through the reaction mixture for 1.5 min. The mixture was stirred for 15 min at -78°C and for 30 min at -15°C (ice-methanol), then diluted with ice cold ethyl acetate (250 mL) and diethyl ether (50 mL), washed with ice cold water (10×50 mL), brine (50 mL) and dried (MgSO4). The residue upon solvent evaporation was dissolved in anhydrous tetrahydrofuran (30 mL), cooled to -15°C (ice-methanol), then treated with glacial acetic acid (2.1 mL, 38.7 mmol) and a 1M tetrahydrofuran solution of tetrabutylammonium fluoride (19.4 mL, 19.4 mmol) and allowed to stand at -20°C for 18 h. The mixture was diluted with ice cold ethyl acetate (150 mL), washed with cold 1M aqueous NaHCO3 (3×75 mL), brine (75 mL) and dried (MgSO4). The residue was passed through a silica gel flash column (75 g, 50-100% ethyl acetateexane, 10%→100% acetone/ethyl acetate, 15% methanol/acetone) to give the title compound (605 mg, 22%) as a yellow oil.
IR (CH2 Cl2) νmax : 3600, 330 (OH), 2100(N3), 1775 and 1610 cm-1 (C═O);
1 H NMR (CDCl3, 200 MHz) δ: 6.1-5.9 (1H, m, vinylic H), 5.5-5.2 (2H, m, vinylic H), 4.88-4.62 (2H, m, allylic CH2), 4.247 (1H, dd, J=2.7 Hz, J=9.5 Hz), 4.3-4.2 (1H, m, H-1'), 3.43-3.2 (3H, m, H-1', CH2 N3), 3.244 (1H, dd, J=2.7 Hz, J=7.4 Hz, H-6), 3.1-2.8 (2H, m, SCH3), 2.65-2.56 (2H, m, CH2 N), 2.335 (6H, s, N(CH3)2), 2.0-1.56 (5H, m, CH2 --CH2 -4, OH) and 1.391 ppm (3H, d, J=6.3 Hz, CH3).
B. (4R,5S,6S)-4-(3"-Azidopropyl)-3-[(2-N,N-dimethyl aminoethyl)thio]-6-[(1'R)-1'-hydroxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2 -ene-2-carboxylic acid ##STR417##
A cold (ice bath) solution of allyl (4 R,5 S,6 S)-4-(3"-azidopropyl)-3-[(2-N,N-dimethylaminoethyl)thio]-6-[(1'R)-1'-hydro xyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate (588 mg, 1.39 mmol) in CH2 Cl2 (35 mL) was treated first with Pd(PPh3)4 (123 mg, 0.1 mmol) followed by a dropwise addition of N-methyl aniline (0.3 mL, 2.78 mmol). The mixture was stirred for 25 min. Then a 0.1M aqueous pH 7.0 phosphate buffer solution (80 mL) and diethyl ether (150 mL) were added. The phases were separated and the organic phase was extracted with a 0.01M aqueous phosphate pH 7.0 buffer solution (2×30 mL). The aqueous phases were combined, washed with diethyl ether (2×50 mL) and passed through a μBondapak C18 reversed phase column (75 g, water, 2%→30% CH3 CN2 O) to give the title compound (399 mg, 75%) as a pale yellow lyophilized powder.
IR (Nujol) νmax : 3500-3100 (OH), 2100 (N3), 1750 and 1590 cm-1 (C═O);
1 H NMR (D2 O, 200 MHz) δ: 4.264 (1H, dd, J=2.7 Hz, J=9.3 Hz, H-5), 4.34-4.2 (1H, m, H-1'), 3.475 (1H, dd, J=2.7 Hz, J=6.0 Hz, H-6), 3.5-3.2 (3H, m, CH2 N3 and H-1'), 3.2-2.95 (4H, m, SCH2 and CH2 N), 2.0-1.8, 1.8-1.47 (4H, 2 sets of m, H--CH-4 and HC HCH2 -4) and 1.33 ppm (3H, d, J=6.3 Hz, CH3).
C. (4R,5S,6S)-4-(3"-Aminopropyl)-3-[(2-N,N-dimethyl aminoethyl)thio]-6-[(1'R)-1'-hydroxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2 -ene-2-carboxylic acid, acetic acid salt ##STR418##
A cold (ice bath) solution of (4 R,5 S,6 S)-4-(2"-azidopropyl)-3-[(2-N,N-dimethyl aminoethyl)thio]-6-[(1' R)-1'-hydroxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid (250 mg, 0.65 mmol) in water (50 mL) was shaken on a Parr hydrogenator at 45-50 psi of hydrogen, for 1 h using 5% Pdlumina as catalyst. More catalyst (600 mg) was then added and the hydrogenation period was pursued for one more hour. The catalyst was removed by filtration and washed with water (3×5 mL). The pH of the aqueous mixture was adjusted to 4.5 with a 1M aqueous acetic acid solution after which it was passed through a μBondapak C18 reversed phase column (75 g, 0.005M ice cold aqueous acetic acid, 1% CH3 CN/0.005M aqeuous acetic acid) to give the title compound (215 mg, 79%) as a pale yellow lyophilized solid.
Purity: 96.1% as determined by HPLC (r.t.=5.83 min, μBondapak C18, 10μ, 10% CH3 CN/KH2 PO4 0.01M, pH 7.4);
UV (water) λmax : 296 (8142);
IR (Nujol) νmax : 3400-3100 (OH, NH2), 1755 and 1600 cm-1 (c=O);
1 H NMR (D2 O, 200 MHz) δ: 4.273 (1H, dd, J=2.7 H2, J=6.9 Hz, H-5), 4.4-4.2 (1H, m, H-1'), 3.458 (1H, dd, J=2.8 Hz, J=6.2 Hz, H-6), 3.4-3.2 (3H, m, CH2 N and H-4), 3.2-3.0 (4H, m, SCH2 and CH2 N), 2.91 (6H, s, (N(CH3)2), 1.92 (2.5 H, s, CH3 CO2 H), 2.0-1.4 (4H, m, CH2 CH2 -4) and 1.330 (3H, d, J=6.4 Hz, CH3).
(4R,5S,6S)-3-{(4S)-4-[(2S)-2-Dimethylaminocarbonyl]pyrrolidinylthio}-4-(2"- quanidinoethyl)-6-[(1'R)-1'-hydroxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-e ne-2-carboxylic acid, acetic acid salt ##STR419##
A solution of (4R,5S,6S)-4-(2"-aminoethyl)-3-{(4S)-4-[(2S)-2-dimethylaminocarbonyl]pyrro lidinylthio}-6-[(1'R)-1'-hydroxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene- 2-carboxylic acid acetic acid salt (0.24 g, 0.51 mmol) in 25 mL of cold (0°-5°C) water was adjusted to pH 8-8.5 with 1M sodium hydroxide. Then aminoiminomethanesulfonic acid (0.38 g, 3.06 mmol) was added in small portions (5 min) while maintaining the pH at 8-8.5 with 1M sodium hydroxide during the addition and for another 2 h. The pH was then adjusted to 5 with acetic acid and the resulting solution was chromatographed on reversed phase silica gel (μBondapak C18, 2.5×15 cm). Elution with a gradient of acetonitrile (0-20%) in 0.005M aqueous acetic acid gave 0.063 g (24%) of the title carbapenem as a white amorphous solid after freeze drying:
Purity by HPLC: 94% on μBondapak C18, 3.9 mm×30 cm, elution 5% CH3 CN--H2 O Ph 7.4 phosphate buffer, flow rate 1 mL/min, uv detector 302 nm, retention time 15.6 min;
UV (H2 O, pH 7.4 phosphate buffer) λmax : 300 nm (8,011);
IR (KBr) νmax : 1760 (C═O of β-lactam), 1660 (C═O of amide) and 1600 (C═O of carboxylate);
1 H NMR (200 MHz, D2 O) δ: 1.33 (d, J=6.32 Hz, 3H, CH3 CHO) 1.7-2.2 (m, 3H, H-3 of pyrrolidine and CH2 -4), 1.92 (s, CH3 CO2 H), 3.0 and 3.07 (2S, 2×3H, CON(CH3)2), 3-3.1 (m overlapping with NCH3, 1H, H-3 of pyrrolidine), 3.2-3.6 (m, 5H, H-5 of pyrrolidine, H-4, H-6 and CH2 NH of ethyl), 3.65 (dd, Jgem =12.2 Hz, JH5,H4 =5.85 Hz, 1H, H-5 of pyrrolidine), 3.9 (m, 1H, H-4 of pyrrolidine), 4.28 (m overlapping with H-5, 1H, CH3 CHO), 4.31 (dd, JH5,H6 =2.75 Hz, JH5,H4 =9.8 Hz, 1H, H-5) and 4.70 ppm (t, J=8.5 Hz, 1H, H-2 of pyrrolidine).
(4R,5R,6S)-4-(3"-Aminopropyl)-3-[(N,N-dimethylamidinomethyl)thio]-6-[(1'R)- 1'-hydroxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid, acidic acid salt ##STR420##
A solution of (4R,5S,6S)-4-(3"-azidopropyl)-3-[(N,N-dimethylaminomethyl)thio]-6-[(1'R)-1 '-hydroxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid (0.270 g, 0.68 mmol) in cold water (80 mL) was hydrogenated at 0°-5°C over 1.2 g of 5% palladium on alumina under 45 psi of hydrogen for 1 h. Then acetic acid (0.08 mn, 1.4 mmol) was added (pH change from 9 to 4) and the catalyst was filtered. The filtrate was chromatographed on reversed phase silica gel (μBondapak C18, 3×12 cm) using a gradient of acetonitrile (0-20%) in 0.01M aqueous acetic acid. Lyophilization of the UV active fractions gave 0.200 g of a white amorphous powder which by 1 H NMR was an equimolar mixture of title material and acetamidine acetate. This mixture was dissolved in ethanol (1 mL) and precipitated with diethyl ether (3 mL). The solid obtained (.about. 0.088 g) was chromatographed on the same column as above to give 0.080 g (27%) of the pure title compound as a white amorphous powder:
Purity by HPLC: 96% on μBondapak C18, 3.9 mm×30 cm, elution 3% CH3 CN--H2 O, pH 7.4 phosphate buffer, flow rate 2 mLin, uv detector 300 nm, retention time 9.3 min;
UV (H2 O, pH 7.4 phosphate buffer) λmax : 292 nm (5,872);
IR (KBr) νmax : 1760 (C═O of β-lactam), 1645 (sh) and 1575 cm-1 (C═O of carboxylate);
1 H NMR (200 MHz, D2 O) δ: 1.32 (d, J=6.38 Hz, 3H, CH3 CHO), 1.4-2.0 (m, 4H, CH2 -1 and 2 of propyl), 1.91 (s, 3H, CH3 CO2 H), 3-3.4 (m, 3H, H-4 and CH2 NH2), 3.12 and 3.29 (2s, 2×3H, N(CH3)2), 3.50 (dd, JH6,H5 =2.92 Hz, JH6,H1 =6.32 Hz, 1H, H-6), 3.84 (s, partially exchanged, SCH2), and 4.2-4.4 ppm (m, 2H, H-5 and CH3 CHO overlapping).
(4R,5S,6S)-4-[2"-(2-Aminoethylthio]ethyl]-3-[(2-cyanoethylthio]-6-[(1'R)-1' -hydroxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR421## A. Allyl (4R,5S,6S)-4-[2"-(2-allyloxycarbonylaminoethylthio)ethyl]-6-[(1'R)-1'-tert -butyldimethylsilyloxyethyl]-3-[(2-cyanoethyl)thio]-7-oxo-1-azabicyclo-[3.2 .0]hept-2-ene-2-carboxylate ##STR422##
A cold (dry ice-acetone) solution of allyl (4 R,5 S,6 S)-6-[(1' R)-1'- tert-butyldimethylsilyloxyethyl]-3-[(2-cyanoethyl)thio]-4-(2"-hydroxyethyl )-7-oxo-1-azabicyclo-[3.2.0]hept-2-ene2-carboxylate (350 mg, 0.73 mmol) in dichloromethane (7 mL) was treated first with diisopropylethylamine (0.34 mL, 1.9 mmol) and then dropwise with trifluoromethanesulfonic anhydride (0.14 mL, 0.88 mmol). The mixture was stirred for 25 min, treated dropwise with N-allyloxycarbonyl cysteamine (354 mg, 2.2 mmol) in dichloromethane (1 mL) and then stirred for 0.5 h at -15°C (dry ice bath was replaced by an ice-methanol bath). The mixture was treated again with more thiol (177 mg, 1.1 mmol) in dichloromethane (0.5 mL) and diisopropylethylamine (0.13 mL, 0.73 mmol), then stirred for 30 more min. It was diluted with ethyl acetate (30 mL), washed with ice cold 1M aqueous NaHSO3 (2×10 mL) water (10 mL), 1M aqueous NaHCO3 (2×10 mL), water (10 mL), brine (10 mL) and dried (MgSO4). The residue was passed through a silica gel flash column (35 g, 10%→50% ethyl acetateexane) to give title compound (321 mg, 70%).
IR (CH2 Cl2) νmax : 3450 (NH), 2250 (CN), 1775 (C═O β-lactam) and 1720 cm-1 (C═O ester and carbamoyl);
1 H NMR (CDCl3, 200 MHz) δ: 6.03-5.82 (2H, m, vinylic H), 5.48-5.19 (4H, m, vinylic H), 5.1 (1H, bs, NH), 4.9-4.63 (2H, m, allylic CH2), 4.583-4.55 (2H, m, allylic CH2), 4.3-4.13 (1H, m, H-1'), 4.158 (1H, dd, J=2.5 Hz, J=9.5 Hz, H-5), 3.55-3.33 (3H, m, CH2 N and H-4), 3.33-3.19, 3.05-2.9 (2H, 2 sets of m, SCH2 at position 3), 3.11 (1H, dd, J=2.7 Hz, J=6.9 Hz, H-6), 2.9-2.63 (6H, 2 sets of m, CH2 CN and CH2 S), 2.1-1.96, 1.96-1.75 (2H, 2 sets of m, CH2 -4), 1.300 (3H, d, J=6.1 Hz, CH3), 0.884 (9H, s, tert-butyl) and 0.090 ppm (6H, s, dimethyl).
B. Allyl (4R,5S,6S)-4-[2"-(2-allyloxycarbonylaminoethylthio)ethyl]-3-[(2-cyanoethyl )thio]-6-[(1'R)-1'-hydroxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carb oxylate ##STR423##
A cold (ice methanol bath) solution of allyl (4 R, 5 S,6 S)-4-[2"-(2-allyloxycarbonylaminoethylthio)ethyl]-6-[(1' R)-1'-tert-butyldimethylsilyloxyethyl]-3-[(2-cyanoethyl)thio]-7-oxol-azabi cyclo[3.2.0]hept-2-ene-2-carboxylate (310 mg, 0.500 mmol) in tetrahydrofuran (7 mL) was treated with glacial acetic acid (0.16 mL, 3.0 mmol) and dropwise with a 1M solution of tetrabutylammonium fluoride in tetrahydrofuran (1.5 mL, 1.5 mmol). The mixture was allowed to stand in the cold room (5°C) for 15 days, then diluted with ethyl acetate (30 mL), washed with ice cold 1M aqueous NaHCO3 (3×15 mL), water (2×15 mL), brine (15 mL) and dried (MgSO4). The residue was passed through a silica gel flash column (15 g, 40→100% ethyl acetateexane) to give the title compound (155 mg, 60%) as a yellow oil.
IR (CH2 Cl2) νmax : 3600 (OH), 3450 (NH), 2250 (CN), 1775 (C═O β-lactam) and 1715 cm-1 (C═O, ester and carbamoyl);
1 H NMR (CDCl3, 200 MHz) δ: 6.05-5.8 (2H, m, vinylic H), 5.50-5.20 (4H, m, vinylic H), 5.05 (1H, bt, NH), 4.82-4.65 (2H, m, allylic CH2), 4.586, 4.559 (2H, d, J=5.5 Hz, allylic CH2), 4.206 (d, J=2.7 Hz, part of H-5), 4.22-4.05 (1H, m, H-1'), 3.7-3.5 (1H, m H-4), 3.5-3.3, 3.3-3.1, 3.1-2.8, 2.8-2.6 (11H, H-6, CH2 N, SCH2, CH2 CN), 2.1-1.6 (3H, m, CH2 -4 and OH) and 1.427 ppm (3H, d, J=6.1 Hz, CH3).
C. (4R,5S,6S)-4-[2"-(2-Aminoethylthio)ethyl]-3-[(2-cyanoethyl)thio]-6-[(1'R)- 1'-hydroxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR424##
A cold (ice bath) solution of allyl (4 R,5 S,6 S)-4-[2"-(2-allyloxycarbonylaminoethylthio)ethyl]-3-[(2-cyanoethyl)thio]-6 -[(1' R)-1'-hydroxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate (150 mg, 0.29 mmol) in dichloromethane (8 mL) was treated first with Pd(Pd3)4 (53 mg, 0.040 mmol) followed by the dropwise addition of N-methyl aniline (0.15 mL, 1.2 mmol). The mixture was stirred for 20 min, then diluted diethyl ether (30 mL) and a 0.1M pH 7.0 aqueous phosphate buffer (15 mL). The organic layer was extracted again with a 0.1M buffer solution (2×7 mL) and water (7 mL).
The aqueous extracts were washed with diethyl ether (2×20 mL) and passed through a μBondapak C18 reversed phase column (45 g, water, 1→6% CH3 CNater) to give the title compound as a lyophilized powder (31 mg, 28%).
Purity: 98.0% as determined by HPLC (r.t.=6.26 min, μBondapak C18, 10μ, 5% CH3 CN/KH2 PO4 0.01M, pH 7.4);
UV (water) λmax : 300 (10,964);
IR (Nujol) νmax : 3500-3100 (OH, NH2), 2250 (CN), 1755 (C═O β-lactam) and 1590 cm-1 (C═O);
1 H NMR (D2 O, 200 MHz) δ: 4.32-4.20 (1H, m, H-1'), 4.244 (d, J=2.7 Hz, part of H-5), 3.608-3.494 (1H, m, H-4), 3.407 (1H, dd, J=2.7 Hz, J=6.6 Hz, H-6), 3.278-3.04 (3H, m, CH2 N and parts of SCH2 at position 3), 3.03-2.71 (6H, m, SCH2 at 3, SCH2 and CH2 CN), 3.70-2.49 (1H, m, part of SCH2), 2.10-1.95, 1.95-1.75 (2H, 2 sets of m, CH2 -4) and 1.322 ppm (3H, d, J=6.4 Hz, CH3).
(4R,5S,6S)-4-(2"-Guanidinoethyl)-6-[(1'R)-1'-hydroxyethyl]-3-[2-(1-pyrrolid inyl)ethylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid, acetic acid salt ##STR425## A. Allyl (4R,5S,6S)-4-(2"-azidoethyl)-6-[(1'R)-1'-tert-butyldimethylsiyloxyethyl]-3 -[2-[1-pyrrolidinyl)ethylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carbox ylate ##STR426##
A cold (dry ice-acetone) solution of allyl (4 R,5 S,6 S)-4(2"-azidoethyl)-6-[(1'B)-1'- tert-butyldimethylsilyloxyethyl]-3-[(2-hydroxyethyl)thio]-7-oxo-1-azabicyc lo[3.2.0]hept-2-ene-2-carboxylate (1.0 g, 2.0 mmol) in dry CH2 Cl2 (20 mL) was treated first with diisopropylethyl amine (0.92 mL, 5.2 mmol) and dropwise with trifluoromethanesulfonic anhydride (0.40 mL, 2.4 mmol). The mixture was stirred for 30 min, pyrrolidine (1.0 mL, 12 mmol) was added in dropwise and it was stirred for 1 h at -15°C (ice-MeOH). The mixture was diluted with a 1:1 EtOAcetroleum ether mixture (100 mL) and washed with ice cold water (10×25 mL). The organic fraction was dried (MgSO4) and passed through a silica gel flash pad (60 g, 20%→100% EtOAc/Hexane, 20% acetone/EtOAc) to give the title compound (640 mg, 58%) as an oil.
IR (CH2 Cl2) νmax : 2100 (N3), 1775 and 1720 cm-1 (C═O);
1 H NMR (CDCl3, 200 MHz) δ: 6.1-5.8 (1H, m, vinylic H), 5.5-5.2 (2H, m, vinylic H), 4.9-4.55 (2H, m, allylic CH2), 4.3-4.1 (1H, m, H-1'), 4.12 (1H, dd, J=2.5 Hz, J=9.5 Hz, H-5), 3.7-3.5 (1H, m, H-4), 3.4-3.2 (2H, m, CH2 N3), 3.07 (1H, dd, J=2.5 Hz, J=7.9 Hz, H-6), 3.04-2.76 (2H, 2 sets of m, SCH2), 2.76-2.5 (6H, m, CH2 N), 2.15-1.95 (1H, m HC H), 1.9-1.6 (5H, m, (CH2)2 and H--C H), 1.313 (3H, d, J=6.2 Hz, CH3), 0.895 (9H, s, tert-butyl) and 0.094 ppm (6H, s, dimethyl).
B. Allyl (4R,5S,6S)-4-(2"-azidoethyl)-6-[(1'R)-1'-hydroxyethyl]-3-[2-(1-pyrrolidiny l)ethylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate ##STR427##
A cold (ice-MeOH bath) solution of allyl (4 R,5 S,6 S)-4-(2"-azidoethyl)-6-[(1'R)-1'- tert-butyldimethylsilyloxyethyl]-3-[2-(1-pyrrolidinyl)ethylthio]-7-oxo-1-a zabicyclo[3.2.0]hept-2-ene-2-carboxylate (620 mg, 1.1 mmol) in anhydrous tetrahydrofuran (8 mL) was treated first with acetic acid (0.36 mL, 6.6 mmol) followed by the dropwise addition of a 1M tetrahydrofuran solution of tetrabutylammonium fluoride (3.3 mL, 3.3 mmol). The mixture was stirred for 15 min, then at 5°C (ice bath) for 1 h and it was allowed to stand for twelve days in the cold room (5°-8°C).
The mixture was diluted with ethyl acetate (30 mL), washed with 1M aqueous NaHCO3 (4×5 mL), brine (5 mL) and dried (MgSO4). The residue was passed through a silica gel flash pad (5 g, ethyl acetateexane 50→100%; acetone/ethyl acetate 20%→100%) to give the title compound (200 mg, 42%) as an oil.
IR (CH2 Cl2) νmax : 3600 (OH), 2100 (N3). 1775 and 1620 cm-1 (C═O);
1 H NMR (CDCl3, 200 MHz) δ: 6.05-5.95 (1H, m, vinylic H), 5.5-5.2 (2H, m, vinylic H), 4.9-4.6 (2H, m, allylic CH2), 4.3-4.2 (1.5 H, m, H-1' and hidden part of H-5), 4.208 (d, J=2.7 Hz, part of H-5), 3.63-3.53 (1H, m, H-4), 3.49-3.35 (2H, m, CH2 N3), 3.155 (1H, dd, J=2.7 Hz, J=7.9 Hz, H-6), 3.09-2.6 (4H, SCH2 CH2 -pyrrolidine), 2.56 (4H, bs, CH2 NCH2), 2.2-1.7 (6H, m, CH2 -4 and CH2 CH2 for pyrrolidine) and 1.395 ppm (3H, d, J=6.2 Hz, CH3).
C. (4R,5S,6S)-4-(2"-Guanidinoethyl)-6-[(1'R)-1'-hydroxyethyl]-3-[2-(1-pyrroli dinyl)ethylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid, acetic acid salt ##STR428##
A cold (ice bath) solution of allyl (4 R,5 S,6 S)-4-(2"-azidoethyl)-6-[(1' R)-1'-hydroxyethyl]-3-[2-(1-pyrrolidinyl)ethylthio]-7-oxo-1-azabicyclo[3.2 .0]hept-2-ene-2-carboxylate (160 mg, 0.370 mmol) in CH2 Cl2 (12 mL) was treated with Pd[PPh3 ]4, (30 mg, 0.02 mmol) followed by the dropwise addition of a 0.5M solution of potassium 2-ethylhexanoate in ethyl acetate (0.74 mL, 0.37 mmol). The mixture was stirred for 15 min, then diluted with diethyl ether (70 mL) and extracted with a 0.04M pH 7.0 aqueous phosphate buffer (3×15 mL) and water (1×15 mL). The aqueous extracts were combined, washed with diethyl ether (2×30 mL) and the pH was adjusted (ice bath) to 5.9 with a 1M aqueous NaH2 PO4 buffer solution. The aqueous mixture was shaken on a Parr hydrogenator at 45-50 psi of hydrogen at 5°C (ice bath) for 1 h using 30% Pdelite (160 mg) as catalyst. Then more catalyst (100 mg) was added and the hydrogenation was carried out for 30 more minutes. The catalyst was removed by filtration and washed with water (2×5 mL). The pH of the aqueous solution (ice bath) was adjusted to 8.0 with a 0.5M aqueous NaOH solution and aminoiminomethane sulfonic acid (360 mg, 2.96 mmol, 8 eq.) was added in portionwise while maintaining the pH between 7.8-8.0 with the NaOH solution. The reaction mixture was stirred for 3 h (ice bath) after which the pH was adjusted to 7.0 with a 1M aqueous acetic acid solution. The aqueous mixture was passed through a μBondapak C18 reversed phase column (60 g) stabilized and eluted with 0.005M aqueous acetic acid solution (1%→2% CH3 CN) to give the title compound (45 mg, 26%) as a lyophilized powder.
Purity: 97.5% determined by HPLC (r.t.=7.17 min, μBondapak C18, 10μ, 10% CH3 CN/KH2 PO4 0.01M, pH 7.4);
UV (water) λmax : 294 (5427);
IR (Nujol) νmax : 3400-3100 (NH), 1765, 1000 (C═O) and 1675-1630 cm-1 (C═N);
1 H NMR (D2 O, 200 MHz) δ: 4.35-4.2 (1H, m, H-1'), 4.292 (1H, dd, J=2.9 Hz, J=9.5 Hz, H-5), 3.502 (1H, dd, J=2.9 Hz, J=6.6 Hz, H-6), 3.8-3.0 (9H, m, H-4, S CH2 CH2 N, CH2 NCH2 of pyrrolidine), 2.2-1.95 (5H, CH2 CH2 pyrrolidine, H--CH at position-4), 1.95-1.7 (1H, m, HC-- H at position-4), 1.91 (1.5 H, s, CH3 CO) and 1.328 ppm (3H, d, J=6.3 Hz, CH3).
(4R,5S,6S)-4-(3"-Aminopropyl)-3-[(3S)-3-pyrrolidinylthio]-6-[(1'R)-1'-hydro xyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR429## A. (3S)-N-Allyloxycarbonyl-3-mercaptopyrrolidine ##STR430##
A cold solution (5°C) of (3R)-N-allyloxycarbonyl-3-hydroxypyrrolidine (1.0 g, 5.84 mmol) in CH2 Cl2 was treated with pyridine (0.532 g, 6.72 mmol) followed by trifluoromethanesulfonic anhydride (1.90 g, 6.72 mmol). After stirring for 15 min, the solvent was evaporated, the residue triturated in diethyl ether and filtered. The crude triflate was redissolved in cold (5° C.) CH3 CN and while bubbling H2 S into the solution, triethylamine (0.71 g, 7 mmol) was added dropwise. Formation of the thiol was completed in 15 min. The solvent was thus evaporated and the crude product purified by chromatography. (SiO2 /5% CH3 CN in CH2 Cl2)to yield 0.787 g (71.9%) of the title compound.
IR (CH2 Cl2)νmax : 1700 (--CO2 --), 1650 cm-1 (>=<).
1 H NMR (CDCl3) δ: 4.50-6.10 (5H, allyl pattern), 3.70-3.90 (1H, m, CH--S--) 3.20-3.70 [4H, m, --(CH2 --)2 N], 2.20-2.40 and 1.70-2.00 (2H, 2m, 2 H-4), 1.70 (1H, d, J=6.57, --SH).
B. Allyl (4R,5S,6S)-4-[(3"-azidopropyl)-3-[(3S)-N-(allyloxycarbonyl)-3-pyrrolidinyl thio]-6-[(1'R)-1'-hydroxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carbo xylate ##STR431##
A cold (5°C) solution of allyl (4R,5S,6S)-4-(3"-azidopropyl)-3-(diphenylphosphono)-6-[(1'R)-1'-hydroxyeth yl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate (from 1.09 g, 3 mmol, of diazoketone) in CH3 CN was treated with (3S)-N-allyloxycarbonyl-3-mercaptopyrrolidine (0.79 g, 4.2 mmol) followed by diisopropylethylamine (0.54 g, 4.2 mmol). The reaction mixture was stirred at 5°C for 18 h then diluted with EtOAc and washed successively with brine, dilute hydrochloric acid, dilute bicarbonate and finally brine again. The organic layer was dried (MgSO4) and evaporated. The crude product was purified by chromatography (SiO2 /15% CH3 CN in CH2 Cl2) to yield 441 mg (29.1%) of the title compound.
IR (CH2 Cl2) νmax : 3610 (--OH), 2105 (--H3) 1775 (β-lactam), 1700 (--CO2 --), 1650 cm-1 (>=<).
1 H NMR (CDCl3) δ: 4.50-6.10 (10H, 2 allyl patterns), 4.15-4.25 (2H, m, H-5, H-1'), 3.70-3.90 (2H, m, H-4, --CHS--), 3.0-3.90 (7H, m CH2 --N3, H-6, >CH2)2)N--), 1.50-2.40 (6H, m, 2H-1", 2H-2", 2H-4 of pyrrolidine), 1.40 (3H, d, J=6.23, --CH2 ').
C. (4R,5R,6S)-4-(3"-Azidopropyl)-3-[(3S)-3-pyrrolidinylthio]-6-[(1'R)-1'-hydr oxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR432##
A solution of allyl (4R,5S,6S)-4-(3"-azidopropyl)-3-[(3S)-N-(allyloxycarbonyl)-3-pyrrolidinylt hio]-6-[(1'R)-1'-hydroxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carbox ylate (0.15 g, 0.3 mmol), triphenylphosphine (0.03 g) and N-methylaniline (0.127 g, 1.19 mmol) in EtOAc (10 mL) was cooled in ice and treated with tetrakis(triphenylphosphine) palladium [0] (0.03 g). The ice bath was removed and the reaction mixture stirred at 20°C for 30 min. Addition of more tetrakis(triphenylphosphine) palladium [0] (0.025 g) completed the reaction in 45 min. The reaction mixture was then extracted with cold water and the aqueous extracts chromatographed on reversed phase silica gel (Partisil). Elution was done with 0-20% CH3 CN in water. The pertinent fractions were lyophilized to give 0.028g (24.5%) of the title compound as a white foam.
IR (Nujol) νmax : 2100 (--N3), 1765 (β-lactam), 1595 cm-1 (--CO2 --).
1 H NMR (D2 O) δ: 4.15-4.35 (2H, m, H-5, H-1'), 3.97 (1H, m, --CH--S--), 3.20-3.70 (8H, m, H-4, H-6, CH2 --H3, --CH2)2 N), 2.40-2.60 and 1.25-2.20 (6H, m, 2 H-1", 2H-2"2H-4 of pyrrolidine), 1.31 (3H, d, J=6.35, --CH3 ').
D. (4R,5S,6S)-4-(3"-Aminopropyl)-3-[(3S)-3-pyrrolidinylthio]-6-[(1'R)-1'-hydr oxyethyl]-7-oxo-1-azabicyclo-[3.2.0]hept-2-ene-2-carboxylic acid ##STR433##
A cold (5°C) solution of (4R,5R,6S)-4-(3"-azidopropyl)-3-[(3S)-3-pyrrolidinylthio]-6-[(1'R)-1'-hydr oxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid (0.042 g, 0.11 mmol) in water (15 mL) was hydrogenated for 1 h at 43 psi, in the presence of 5% Pdl2 O3 (0.04 g). Then the catalyst was filtered off and the pH of the filtrate lowered to 6.3 by adding 1M NaH2 PO4. The aqueous solution was chromatographed on reversed phase silica gel (Partisil) eluting with cold water. Lyophilization of the pertinent fractions gave an impure white solid. A second chromatography, this time eluting with 0.6 ml acetic acid/1L of water gave 0.025 g (54.7%) of the pure title compound as the acetic acid salt.
IR (Nujol) νmax : 1755 cm-1 (β-lactam);
1 H NMR (D2 O) δ: 4.20-4.40 (2H, m, H-5, H-1'), 3.99 (1H, m, --CH--S), 3.15-3.70 (6H, m, H-6, H-4, --CH2)2 N), 3.05 (2H, m, CH2 --N), 2.30-2.60 and 1.50-2.15 (6H, m, 2H-1", 2H-2", 2H-4 of pyrrolidine), 1.33 (3H, d, J: 6.33--CH3 '), 1.92 (3H, s, acetic acid),
(4R,5S,6S)-4-(3"-Aminopropyl)-3-[(2-quanidinoethyl)thio]-6-[(1'R)-1'-hydrox yethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid, acetic acid salt ##STR434##
A suspension of (4R,5S,6S)-4-(3"-azidoethyl)-3-[(2-guanidinoethyl)thio]-6-[(1'R)-1'-hydrox yethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid (0.300 g, 0.76 mmol) in cold water (150 mL) was hydrogenated at 0°-5° C. over 1.0 g of 5% palladium on alumina under 45 psi of hydrogen for 1 h. After the addition of 0.1 mL (1.6 mmol) of acetic acid, the catalyst was filtered and the filtrate was chromatographed twice on reversed phase silica gel (μBondapak C18, 2.5×15 cm) using 0.005M acetic acid as eluent. Lyophilization of the UV active fractions gave 0.23 g (70%) of the title carbapenem as a white amorphous solid: [α]22D +32.2° (c 1.0, water).
Purity by HPLC: 99% on μBondapak C18, 3.9 mm×30 cm, elution water pH 7.4 phosphate buffer, flow rate 0.8 mL/min, UV detector 302 nm, retention time 8.27 min;
UV (water, pH 7.4 phosphate buffer) λmax : 302 nm (6,390);
IR (KBr) νmax : 1750 (C═O of β-lactam), 1680, 1630 and 1580 cm-1 (C═O of carboxylate);
1 H NMR (200 MHz, D2 O) δ: 1.33 (d, J=6.34 Hz, 3H, CH3 CHO), 1.4-2.0 (m, 4H, CH2 -1 and 2 of propyl), 1.92 (s, CH3 CO2 H), 2.8-3.4 (m, 4H, SCH2 and CH2 NH2), 3.37 (m, overlapping with H-6, 1H, H-4), 3.40 (dd, JH6,H5 =2.6 Hz, JH6,H1 =6.4 Hz, 1H, H-6), 3.48 (t, J=5.8 Hz, 2H, CH2 NH--C(NH)NH2), 4.25 (dd, overlapping with CH3 CHO, JH5,H6 =2.6 Hz, 1H, H-5) and 4.28 ppm (m, 1H, CH3 CHO).
(4R,5S,6S)-4-(2"-Guanidinoethyl)-3-[(2-quanidinoethyl)thio]-6-[(1'R)-1'-hyd roxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-3-carboxylic acid, acetic acid salt ##STR435##
A solution of (4R,5S,6S)-4-(2"-aminoethyl)-3-[(2-aminoethyl)thio]-6-[(1'R)-1'-hydroxyeth yl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid, acetic acid salt (0.270 g, 0.73 mmol) [prepared in Example 115] in cold water (50 mL) was adjusted to pH 8.5 with 1M aqueous sodium hydroxide and treated at 0°-5°C with aminoiminomethanesulfonic acid (0.80 g, 6.44 mmol) added in small portions over 5 min while maintaining the pH between 8 and 8.5 with the base. After 2.5 h, the pH was adjusted to 4.5 with acetic acid and the solution was chromatographed twice on reversed phase silica gel (μBondapak C18, 2.5×15 cm) using water as eluent. Lyophilization of the UV active fractions gave 0.080 g (23%) of the title carbapenem as a white amorphous solid.
Purity by HPLC: 99% on μBondapak C18, 3.9 mm×30 cm, elution 0.01M phosphate buffer, flow rate 2 mLin, uv detector 300 nm, retention time 6.75 min;
UV (water, pH 7.4 phosphate buffer) λmax : 302nm (7,250);
IR (KBr) νmax : 1755 (C═O of β-lactam), 1670, 1640 and 1570 cm-1 (C═O of carboxylate);
1 H NMR (200 MHz, D2 O) δ: 1.33 (d, J=6.34 Hz, 3H, CH3 CHO), 1.7-2.2 (m, 2H, CH2 -1 of ethyl), 1.92 (s, CH3 CO2 H), 2.7-3.2 (m, 2H, SCH2), 3.2-3.7 (m, 6H, H-4, H-6, CH2 -2 of ethyl and SCH2 CH2 N), and 4.2-4.4 ppm (m, 2H, H-5 and CH3 CHO).
(4R,5R,6S)-3-[(2-Cyanoethyl)thio]-6-[(1'R)-1'-hydroxyethyl]-4-[2"-(1-pyridi nium)ethyl]7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate ##STR436##
A solution of allyl (4R,5S,6S)-6-[(1'R)-1'-tert-butyldimethylsilyloxyethyl]-3-[(2-cyanoethyl)t hio]-4-(2"-hydroxyethyl)-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate (0.481 g, 1 mmol) [prepared in Example 125] in dry dichloromethane (10 mL) was cooled to -78°C and treated under Argon with N,N-diisopropylethylamine (0.262 mL, 1.5 mmol) followed by trifluoromethanesulfonic anhydride (0.194 mL, 1.15 mmol) dropwise over 3 min. After 20 min at -78°C, pyridine (0.324 mL, 4 mmol) was added. The reaction mixture was left standing at -20°C for 18 h, then concentrated under vacuum without heating. The residue was dissolved in dry tetrahydrofuran (20 mL), cooled to -15°C and treated under Argon with acetic acid (0.76 mL) followed by 6 mL (6 mmol) of a 1M solution of tetrabutylammonium fluoride in tetrahydrofuran. The solution was allowed to stand at 0°C for 96 h, then tetrakis (triphenylphosphine) palladium [0] (0.090 g) was added followed by N,N-diisopropylethylamine (0.350 mL, 2 mmol). The resulting reaction mixture was stirred under Argon at 0°C After 3 h the reaction mixture was extracted with cold water (30 mL). The pH of the aqueous phase was adjusted to 6.5 by NaOH 1N then the aqueous extract was washed with diethyl ether and maintained under vacuum to remove traces of organic solvent. The solution was filtered then was chromatographed on reversed phase silica gel (μBondapak C18, 3.5×14 cm) using water as eluent. The UV active fractions were combined, lyophilized and chromatographed a second time on the same column using a gradient of acetonitrile (0-1%) in water as eluent. Final lyophilization gave 0.310 g of white amorphous powder which was crystallized in cold methanol (20 mL) to give the pure crystalline title carbapenem (0.262 g, 68%).
Purity by HPLC: 99.96% on μBondapak C18, 3.9 mm×30 cm, elution 2% CH3 CN-water pH 7.4 phosphate buffer, flow rate 0.8 mLin, UV detector 300 nm, retention time 9.97 min,;
UV (water, pH 7.4 phosphate buffer) λmax : 298 nm (8101), 260 nm (7531);
IR (KBr) νmax : 2250 (CN, 1755 (C═O of β-lactam and 1600 cm-1 (C═O of carboxylate);
1 H NMR (200 MHz, D2 O) δ: 1.37 (d, J=6.35, 3H, CH3 CHO), 2.2-2.6 (m, 2H, CH2 -4), 2.8 (m, 2H, CH2 CN), 2.9-3.1 (m, 2H, SCH2), 3.45 (m, 1H, H-4), 3.56 (dd, JH6,H5 =2.97 Hz, JH6,H1 =7.04 Hz 1H, H-6) 4.20-4.40 (m, 2H, H-5 and , CH3 C HO), 4.81 m, overlapping with HOD signal, 2H, N+ --CH 2), 8.11 (m, 2H, H-3 and H-5 on pyridinium), 8.59 (m, 1H, H-4 on pyridinium), 8.91 (m, H-2 and H-6 on pyridinium).
(4R,5S,6S)-6-[(1'R)-1'-Hydroxyethyl]-3-[(2-cyanoethyl)thio]-4-[2"-(β-c hloro-L-alanyl-β-chloro-L-alanyl)aminoethyl]-7-oxo-1-azabicyclo[3.2.]- hept-2-ene-2-carboxylic acid ##STR437##
A solution of (4R,5S,6S)-6-[(1'R)-1'-hydroxyethyl]-3-[(2-cyanoethyl)thio]-4-(2"-aminoeth yl)-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid (0.475 g, 1.46 mmol) in 0.2M pH 7.0 phosphate buffer (15 mL) was cooled to 0°C while bubbling Argon through the solution. The pH was adjusted to 10.2 with 1N NaOH and N-carboxyanhydride of β-chloro- L-alanine (0.22 g, 1.46 mmol) in dioxane (1.5 mL) was added in one portion with vigorous stirring. When the pH dropped to 7.2, it was readjusted to 10.2 and left there for 1 h. The reaction was stopped by adjusting the pH to 6.0 with 1N HCl. Argon was bubbled through the solution for 30 min at 0°C while readjusting the pH to 6.0 whenever it rose above 6∅ The crude reaction mixture was passed through a column of μBondapak C18 reverse phase silica (4.5×10.5 cm). Appropriate fractions belonging to the product were combined and lyophilized to a solid which was rechromatographed on μBondapak C18 reverse phase silica (4.5×10.5 cm). The slightly less polar title compound, separated very closely from the monopeptide derivative, was eluted with a mixture of water and CH3 CN (94:6, gradient elution) and was obtained as a yellowish fluffy solid after lyophilization (0.049 g, 6.8%).
Purity 92.2% by HPLC: UV detection at 300 nm on μBondapak C18 (4 mm×30 cm), 10% CH3 CN in pH 6.8 phosphate buffer, flow rate 1 mLin, retention time 8.31 min.
UV λmax : 300 nm;
IR (Nujol) νmax : 1750 cm-1 (C═O, β-lactam).
1 H NMR (200 MHz, D2 O) δ: 1.37 (d, 3H, CH3, J=6.4 Hz), 1.66-1.77; 2.06-2.16 (m, 2H, CH2), 2.83-2.89 (m, 2H, CH2 CN), 2.91-3.04; 3.08-3.21 (m, 2H, SCH2), 3.32-3.41 (m, 3H, CH2 NH, H-4), 3.58 (dd, 1H, H-6, J6,1 =5.88 Hz) 3.78-4.08 (m, 4H, Cβ H2), 4.17 (t, 1H, Cα H, Jα,β =4.61 Hz), 4.27 (dd, 1H, H-5, J4,5 =7.92 Hz, J5,6 =2.48 Hz), 4.31 (m, 1H, H-1'), 4.76 (t, 1H, Cα H, Jα,β =5.37 Hz).
Sodium (4R,5S,6S)-4-(2"-azidoethyl]-3-[(2-fluoroethyl)thio]-6-[(1'R)-1'-hydroxyet hyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate ##STR438## A. Allyl (4R,5R,6S)-4-(2"-azidoethyl)-6-[(1'R)-1'-tert-butyldimethylsilyloxyethyl]- 3-[(2-fluoroethyl)thio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate ##STR439##
To a cold (ice bath) and well stirred solution of diethylammonium sulfur trifluoride (DAST, 1.05 mL, 8.06 mmol) in CH2 Cl2 (20 mL) was added dropwise, over a 10 min period, allyl (4 R,5 S,6 S)-4-(2"-azidoethyl)-6-[(1')-1- tert-butyldimethylsilyloxyethyl]-3-[(2-hydroxyethyl)thio]-7-oxo-1-azabicyc lo[3.2.0]hept-2-ene-2-carboxylate in CH2 Cl2 (80 mL). The mixture was stirred for 15 min, then quenched with ice cold water (100 mL) and finally diluted with a 1 mixture of ethyl acetate/diethyl ether and water (400 mL). The aqueous phase was extracted with ethyl acetate/diethyl ether (1/1, 300 mL) and the organic extracts were combined, washed with ice cold water (2×250 mL), ice cold 1N aqueous HCl, water, 1M aqueous NaHCO3, brine and dried (MgSO4). The residue was passed through a silica gel flash pad (180 g, hexane, 5→25% ethyl acetate/hexane) to give the title compound (1.54 g, 38%) as a yellow oil:
IR (CH2 Cl2) νmax : 2100 (N3), 1775 and 1710 cm-1 (C═O);
1 H NMR (CDCl3, 200 MHz) δ: 6.05-5.85 (1H, m, vinylic H), 5.49-5.22 (2H, m, vinylic H), 4.9-4.4 (4H, m, allylic CH2 and CH2 F), 4.3-4.13 (1H, m, H-1'), 4,145 (1H, dd, J=2.7 Hz, J=9.5 Hz, H-5), 3.7-3.55 (1H, m, H-4), 3.46-3.3 (2H, m, CH2 N3), 3.4-3.15, 3.05-2.8 (2H, 2 sets of m, SCH2), 3.088 (1H, dd, J=2.7 Hz, J=7.7 Hz, H-6), 2.13-1.95, 1.85-1.65 (2H, 2 sets of m, CH2 -4), 1.309 (3H, d, J=6.1 Hz, CH3), 0.897 (9H, S, tert-butyl) and 0.095 ppm (6H, s, dimethyl).
B. Allyl (4R,5S,6S)-4-[2"-azidoethyl]-3-[(2-fluoroethyl)thio]-6-[(1'R)-1'-hydroxyet hyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate ##STR440##
A cold (ice-MeOH) solution of allyl (4 R,5 S,6 S)-4-(2"-azidoethyl)-6-[(1' R)-1'- tert-butyldimethylsilyloxyethyl]-3-[(2-fluoroethyl)thio]-7-oxo-1-azabicycl o[3.2.0]hept-2-ene-2-carboxylate (457 mg, 0.92 mmol) in tetrahydrofuran (8 mL) was treated first with glacial acetic acid (0.3 mL, 5.5 mmol) and then dropwise with a 1M solution of tetrabutylammonium fluoride in tetrahydrofuran (2.75 mL, 2.75 mmol). The mixture was stirred for 10 min and then was allowed to stand in the cold room (5°-8°C) for nine days. It was then diluted with ethyl acetate (50 mL), washed with ice cold 1M aqueous NaHCO3 (4×25 mL), water (2×25 mL), brine (25 mL) and dried (MgSO4). It was passed through a silica gel flash column (15 g, hexane, ethyl acetateexane 10%→50%) to give the title compound (240 mg, 68%) as an oil.
IR (CH2 Cl2) νmax : 3400 (OH), 3100 (N3), 1778 and 1612 cm-1 (C═O);
1 H NMR (CDCl3, 200 MHz) δ: 6.03-5.9 (1H, m, vinylic H), 5.5-5.2 (2H, m, vinylic H), 4.9-4.35 (4H, m, allylic CH2 and CH2 --F), 4.3-4.15 (1H, m, H-1'), 4.248 (1H, dd, J=2.7 Hz, J=9.5 Hz, H-5), 3.7-3.5 (1H, m, H-4), 3.5-3.3 (2H, m, CH2 N3), 3.3-2.8 (2H, 2 sets of m, SCH2), 3.160 (1H, dd, J=2.7 Hz, J=8.0 Hz, H-6), 2.15-1.95, 1.84-1.65 (2H, 2 sets of m, CH2 -4), 1.834 (1H, d, J=5.1 Hz, OH) and 1.395 ppm (3H, d, J=Hz, CH3).
C. Sodium (4R,5S,6S)-4-(2"-azidoethyl)-3-[(2-fluoroethyl)thio]-6-[(1'R)-1'-hydroxyet hyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate ##STR441##
To a cold (ice bath) solution of allyl (4 R,5 S,6 S)-4-(2"-azidoethyl)-3-[(2-fluoroethyl)thio]-6-[(1' R)-1'-hydroxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate (585 mg, 1.52 mmol) in CH2 Cl2 (20 mL) was added Pd(PPh3)4 (142 mg, 0.114 mmol) and dropwise a 0.5M solution of potassium ethyl-2-hexanoate in ethyl acetate (3.0 mL, 1.50 mmol). The mixture was stirred for 20 min, diluted with diethyl ether (80 mL) and extracted with water (4×15 mL). The aqueous extracts were combined, washed with water (2×20 mL) and passed through a μBondapak C18 reversed phase column (200 g, 1%→10% CH3 CNater) to give the title compound (40.2 mg, 72%) as an off-white lyophilized solid.
Purity: 97.8% determined by HPLC (r.t.=14.85 min, μBondapak C18, 10 μ, 5% CH3 CN/KH2 PO4 0.01M, pH 7.4);
UV (H2 O) λmax : 302 (9184);
IR (Nujol) νmax : 3350 (OH), 2100 (N3), 1750 and 1600 cm-1 (C═O);
1 H NMR (D2 O, 200 MHz) δ: 4.83-4.75, 4.6-4.5 (2H, 2 sets of m, CH2 F), 4.35-4.2 (1H, m, H-1'), 4.210 (1H, dd, J=2.8 Hz, J=9.0 Hz, H-5), 3.65-2.9 (6H, m, H-4, SCH2, CH2 N3, H-6), 2.17-2.0, 1.9-1.7 (2H, 2 sets of m, CH2 -4) and 1.331 ppm (3H, d, J=Hz, CH3).
(4R,5S,6S)-4-(3"-Aminopropyl)-3-[(4-piperidinyl)thio]-6-[(1'R)-1'-hydroxyet hyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR442##
A cold (5°C) solution of (4R,5S,6S)-4-(3"-azidopropyl)-3-[(4-piperidinyl)thio]-6-[(1'R)-1'-hydroxye thyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid (0.08 g, 0.20 mmol) in water (40 mL) was hydrogenated at 45 psi for 1 h in the presence of 5% Pd/Al2 O3 (0.08 g). The catalyst was then filtered off and the pH of the filtrate lowered to 5.0 by adding acetic acid. This acidified aqueous solution was chromatographed on reversed phase silica gel (Partisil) eluting with 15% CH3 CN in water. Lyophilization of the pertinent fractions gave 0.066 g (76.8%) of the title compound as the acetic acid salt.
IR (Nujol) νmax : 1760 (β-lactam), 1580 cm-1 (--CO2 --).
1 H NMR (D2 O) δ: 4.20-4.40 (2H, m, H-5, H-1'), 3.25-3.60 [5H, m, H-6, (2 H-2, 2 H-6 of piperidine)], 2.95-3.15 (4H, m, CH2 --N, H-4, H-4 of piperidine), 1.50-2.40 [8H, m, 2H-1", 2H-2"(2H-3 2H-5 of piperidine)], 1.93 (3H, s, acetic acid), 1.34 (3H, d, J=6.30, --CH3 ').
(4R,5S,6S)-3-[(N,N-Dimethylamidinomethyl)thio]-4-(3"-quanidinopropyl)-6-[(1 'R)-1'-hydroxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid, acetic acid salt ##STR443##
A solution of (4R,5S,6S)-4-(3"-aminopropyl)-3-[(N,N-dimethylamidinomethyl)thio]-6-[(1'R) -1'-hydroxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid (0.203 g, 0.47 mmol) in cold water (0°-5°C, 30 mL) was adjusted to pH 8.5 with 1M aqueous sodium hydroxide and then treated with aminoiminomethanesulfonic acid (0.230 g, 1.85 mmol) added in small portions over 5 min while maintaining the pH at 8-8.5. After 2 h, the pH was adjusted to 4.8 with glacial acetic acid and the solution was chromatographed on reversed phase silica gel (μBondapak C18, 2.5×13.5 cm) using 0.01M aqueous acetic acid as eluent. Lyophilization of the UV active fractions gave 0.090 g (40%) of the title carbapenem as a white amorphous solid:
Purity by HPLC: 98% on μBondapak C18, 3.9 mm×30 cm, elution 5% CH3 CN--H2 O, pH 7.4 phosphate buffer, flow rate 1 mL/min, UV detector 292 nm, retention time 7.52 min;
UV (water, pH 7.4 phosphate buffer) λmax : 292 nm (6,340);
IR (KBr) νmax : 1760 (C═O of β-lactam), 1680, 1650 and 1580 cm-1 (C═O of carboxylate);
1 H NMR (200 MHz, D2 O) δ: 1.32 (d, J=6.36 Hz, 3H, CH3 CHO), 1.4-1.9 (m, 4H, CH2 -1 and 2 of propyl), 1.92 (s, CH3 CO2 H), 3.12 and 3.29 (2s, 2×3H, NCH3), 3.1-3.4 (m, 3H, H-4 and CH2 -3 of propyl), 3.44 (dd, JH6,H5 =2.83 Hz, JH6,H1 =5.97 Hz, 1H, H-6), 3.86 (s, 2H, SCH2) and 4.2-4.4 ppm (m, 2H, H-5 and CH3 CHO overlapping).
(4R,5S,6S)-3-[(2-N,N-Dimethylaminoethyl)thio]-4-(2"-quanidinoethyl)-6-[(1'R )-1'-hydroxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid, acetic acid salt ##STR444## A. Allyl (4R,5S,6S)-4-(2"-azidoethyl)-6-[(1'R)-1'-tert-butyldimethylsilyloxyethyl]- 3-[(2-N,N-dimethylaminoethyl)thio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-ca rboxylate ##STR445##
A cold (ice-MeOH bath) solution of enol phosphate prepared from (3 S,4 R)-3-[(1'R)-1'-tert-butyldimethylsilyloxyethyl]-4-[(1"R)-1"-(2-azidoethyl) -3"-diazo-3"-allyloxycarbonyl-2"-oxopropyl]azetidin-2-one (4.64 g, 10 mmol) in acetonitrile (45 mL) was treated slowly with N,N-dimethylaminoethanethiol (1.05 g, 10.0 mmol) in CH3 CN (2 mL) and dropwise with diisopropylethyl amine (1.92 mL, 11.0 mmol). The mixture was stirred for 1.5 h at -10°C→0°C, then cooled again (ice-methanol) and treated again with the mercaptan (520 mg, 5 mmol) in CH3 CN (1 mL) and diisopropylethylamine (0.96 mL, 5.5 mmol). The mixture was stirred for 1 h at -15° and was allowed to set in the refrigerator (-20°C) for 18 h. It was diluted with a 1:1 mixture of ethyl acetate/diethyl ether (500 mL), washed with ice cold water (5×100 mL), brine (100 mL) and dried (MgSO4). The residue was passed through a silica gel flash column (100 g, 50→100% ethyl acetate/hexane, 10% acetone/ethyl acetate) to give the title compound (4.0 g, 76%) contaminated with the opened β-lactam side product.
IR (CH2 Cl2) νmax : 2100 N3, 1775 and 1715 cm-1 (C═O);
1 H NMR (CDCl3, 200 MHz) δ: 6.1-5.8 (1H, m, vinylic H), 5.5-5.1 (2H, m, vinylic 3H), 4.9-4.6 (2H, m, allylic-CH2), 4.3-4.1 (1H, m, H-1'), 4.2-4.15 (1H, dd, H-5), 3.7-3.5 (1H, m, H-4), 3.5-3.3 (2H, m, CH2 --N3), 3.071 (1H, dd, J=3.0 Hz, J=7.1 Hz, H-6), 3.1-2.85 (2H, m, SCH2), 2.7-2.4 (2H, m CH2 --N), 2.28 (6H, s, N(CH3)2), 2.1-1.6 (2H, m, CH2 -4), 1.314 (3H, d, J=6.1 Hz, CH3), 0.897 (9H, s, tert-butyl) and 0.069 ppm (6H, s, dimethyl).
B. Allyl (4R,5S,6S)-4-(2"-azidoethyl)-3-[(2-N,N-dimethylaminoethyl)thio]-6-[(1'R)-6 -hydroxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate ##STR446##
A cold (ice-methanol bath) solution of allyl (4 R,5 S,6 S)-4-(2"-azidoethyl)-6-[(1'R)-1'- tert-butyldimethylsilyloxyethyl]-3-[(2-N,N-dimethylaminoethyl)thio]-7-oxo- 1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate (4.0 g, 7.6 mmol, 37% pure) in tetrahydrofuran was treated first with glacial acetic acid (2.5 mL, 45.6 mmol) and dropwise with a 1M tetrahydrofuran solution of tetrabutylammonium fluoride (22.8 mL, 22.8 mmol). The mixture was allowed to stand at 5°C for eleven days, then diluted with ethyl acetate (400 mL), washed with ice cold 1M aqueous NaHCO3 (2×25 mL) ice cold water (3×25 mL), brine (25 mL) and dried. The residue was passed through a silica gel flash column (60 g, 10→100% acetonethyl acetate) to give the title compound (473 mg, 41%) as a yellow oil.
IR (CH2 Cl2) νmax : 3610, 3450 (OH), 2110 (N3), 1780 and 1610 cm-1 (C═O);
1 H NMR (CDCl3, 200 MHz) δ: 6.1-5.9 (1H, m, vinylic H), 5.49-5.22 (2H, m, vinylic H), 4.9-4.6 (2H, m, allylic CH2), 4.235 (1H, dd, J=2.7 Hz, J=9.3 Hz, H-5), 4.33-4.2 (1H, m H-1'), 3.7-3.5 (1H, m, H-4), 3.47-3.3 (2H, m, CH2 N3), 3.150 (1H, dd, J=2.7 Hz, J=7.9 Hz, H-6), 3.1-2.9 (2H, m, SCH2), 2.7-2.4 (2H, m, CH2 N), 2.284 (6H, s, N(CH3)2), 1.95-1.7 (3H, m, OH, CH2 -4) and 1.400 ppm (3H, d, J=6.2 Hz, CH3).
C. (4R,5S,6S)-4-(2"-Azidoethyl)-3-[(2-N,N-dimethylaminoethyl)thio]-6-[(1'R)-1 '-hydroxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR447##
To a cold (ice bath) solution of allyl (4 R,5 S,6 S)-4-(2"-azidoethyl)-3-[(2-N,N-dimethylamino-ethyl)thio]-6-[(1' R)-1'-hydroxyethyl]-7-oxo-1-azabi-cyclo[3.2.0]hept-2-ene-2-carboxylate (470 mg, 1.14 mmol) in CH2 Cl2 (17 mL) was added Pd(PPh3)4 (105 mg, 0.086 mmol) and a 0.5M solution of potassium 2-ethylhexanoate in ethyl acetate (2.28 mL, 1.14 mmol). The mixture was stirred for 15 min, diluted with diethyl ether (100 mL) and extracted with ice cold water (4×20 mL). The organic extracts were combined, washed with diethyl ether (2×40 mL) and passed through a μBondapak C18 reversed phase column (67.5 g, water, 1%→10% CH3 CN2 O) to give the title compound (200 mg, 46%) as a yellow lyophilized powder.
IR (Nujol) νmax : 3400-3100 (OH), 2100 (N3), 1755 and 1600 cm-1 (C═O);
1 H NMR (D2 O, 200 MHz) δ: 4.280 (1H, dd, J=2.4 Hz, J=6.8 Hz, H-5), 4.32-4.2 (1H, m, H-1'), 3.67-3.54 (1H, m, H-4), 3.481 (1H, dd, J=2.7 Hz, J=6.1 Hz, H-6), 3.5-3.34 (2H, m, CH2 N3), 3.2-2.92 (4H, m, SCH2 and CH2 N), 2.60 (6H, s, N(CH3)2), 2.18-2.02, 1.91-1.75 (2H, 2 sets of m, CH2 -4) and 1.329 ppm (3H, d, J=6.1 Hz, CH3).
D. (4R,5S,6S)-3-[(2-N,N-Dimethylaminoethyl)thio]-4-(2"-guanidinoethyl)-6-[(1' R)-1'-hydroxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid, acetic acid salt ##STR448##
The pH of a cold (ice bath) 0.04M pH 7.0 aqueous phosphate buffer solution (67 mL) of (4 R,5 S,6 S)-4-(2"-azidoethyl)-3-[(2-N,N-dimethylaminoethyl)thio]-6-[(1' R)-1'-hydroxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid (190 mg, 0.514 mmol) was adjusted to 5.9 with a 1M aqueous NaH2 PO4 solution. The mixture (ice bath) was shaken on a Parr hydrogenator at 45-50 psi of hydrogen for 1 h using 30% Pdelite (270 mg) as catalyst. More Pd/Celite was added (270 mg) and the hydrogenation was pursued for one more hour. The catalyst was removed by filtration and washed with water (2×10 mL). The pH of the aqueous solution (ice bath) was adjusted to 7.8-8.0 with a 1N aqueous NaOH solution. Then aminoiminomethanesulfonic acid (354 mg, 2.87 mmol) was added portionwise and the pH was maintained at 7.8-8.0 with the 1N aqueous NaOH solution. The reaction mixture was stirred for a 1.5 h period after which more aminoiminomethanesulfonic acid (124 mg, 1 mmol) was added. The pH was maintained at 7.8-8.0 and the stirring period was pursued for one more hour. At the end of the reaction, the pH was adjusted to 7.0 with a 1.0M aqueous acetic acid solution and the mixture was passed through a μBondapak C18 reversed phase column (130 g, ice cold 0.005M aqueous AcOH, 1% CH3 CN/0.005M AcOH) to give the title compound (60 mg, 26%) as an off-white lyophilized powder.
Purity: 96.9% as determined by HPLC (r.t.=6.02 min, μBondapak C18, 10 μ, 3% CH3 CN/KH2 PO4 0.01M, pH 7.4);
UV (H2 O) λmax : 296 (6089);
IR (Nujol) νmax : 3400-3100 (NH, OH), 1760, 1600-1540 (C═O), 1680-1620 cm-1 (C═N);
1 H NMR (D2 O, 200 NH2) δ: 4.33, 4.32 (d, J=2.9 Hz, part of H-5), 4.33-4.2 (m, H-1'and part of H-5), 3.51 (1H, dd, J=2.9 Hz, J=6.6 Hz, H-6), 3.41-3.21 (5H, m, CH2 -guanidine, CH2 N, H-4), 3.20-2.96 (2H, m, SCH2), 2.91 (6H, s, NCH3), 2.24-2.03, 1.9-1.55 (2H, 2 sets of m, CH2 -4), 1.925 (2, 2H, s, CH3 CO2) and 1.33 ppm (3H, d, J=6.4 Hz, CH3).
(4R,5S,6S)-3-[(N,N-Dimethylamidinomethyl)thio]-4-(3"-N-formimidoylaminoprop yl)-6-[(1'R)-1'-hydroxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxy lic acid, acetic acid salt ##STR449##
A solution of (4R,5R,6S)-4-(3"-aminopropyl)-3-[(N,N-dimethylamidinomethyl)thio]-6-[(1'R) -1'-hydroxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid, acetic acid salt (0.204 g, 0.474 mmol) in cold water (30 mL, 0°-5°C) was adjusted to pH 8.5 with 1M aqueous sodium hydroxide and then treated with benzyl formimidate hydrochloride (0.40 g, 2.3 mmol) added in small portions over 5 min while maintaining the pH at 8-8.5 with 1M sodium hydroxide. After 15 min, the pH was adjusted to 5 with concentrated acetic acid and the reaction mixture was washed with ethyl acetate (25 mL). The aqueous phase was maintained under vacuum to remove traces of organic solvent and then chromatographed twice at 4°C on reversed phase silica gel (μBondapak C18, 2.5×14 cm). Elution with 0.01M aqueous acetic acid gave 0.088 g (41%) of the title compound as a white amorphous powder after lyophilization.
Purity by HPLC: 97% on μBondapak C18, 3.9 mm/30 cm, elution 3% CH3 CN-water, pH 7.4 phosphate buffer, flow rate 0.8 mL/min, UV detector 292 nm, retention time 5.8 min;
UV (water, pH 7.4 phosphate buffer) λmax : 292 nm (7,200);
IR (KBr) νmax : 1750 (C═O of β-lactam), 1715, 1645 and 1590 cm-1 (C═O of carboxylate);
1 H NMR (200 MHz, D2 O) δ: 1.32 (d, J=6.32 Hz, 3H, CH3 CHO), 1.4-1.9 (m, 4H, CH2 -1 and 2 of propyl), 1.92 (s, CH3 CO2 H), 3.12 and 3.28 (2×s, 2×3H, NCH3), 3.0-3.6 (m, 4H, H-4, H-6 and CH2 -3 of propyl), 3.84 (s, 2H, SCH2), 4.2-4.4 (m, 2H, H-5 and CH3 CHO overlapping) and 7.81 ppm (s, 1H, C H═NH).
(4R,5 R,6S)-4-(3"-N-Formimidoylaminopropyl)-3-[(2-quanidinoethyl)thio]-6-[(1'R)- 1'-hydroxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid, acetic acid salt ##STR450##
A solution of (4R,5S,6S)-4-(3"-aminopropyl)-3-[(2-guanidinoethyl)thio]-6-[(1'R)-1'-hydro xyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid, acetic acid salt (0.300 g, 0.695 mmol) in cold water (30 mL, 0°-5°C) was adjusted to pH 8.5 with 1M aqueous sodium hydroxide and then treated with benzyl formimidate hydrochloride (0.60 g, 3.5 mmol) added in small portions over 5 min. The pH was maintained at 8-8.5 with 1M sodium hydroxide throughout the addition and for another 15 min. The pH was then adjusted to 5 with concentrated acetic acid and the reaction mixture was washed with ethyl acetate (20 mL). The aqueous phase was then maintained under vacuum to remove traces of organic solvent and then chromatographed at 4°C on reversed phase silica gel (μBondapak C18, 2.5×15 cm). Elution with 0.01M aqueous acetic acid gave 0.190 g (59%) of the title carbapenem as a white amorphous solid after lyophilization: [α]22D +26.6° (c 1.0, water).
Purity by HPLC: 97% on μBondapak C18, 3.9 mm×30 cm, elution 2% CH3 CN-water, pH 7.4 phosphate buffer, flow rate 1 mLin, UV detector 300 nm, retention time 6.1 min.;
UV (water, pH 7.4 phosphate buffer) λmax : 302 nm (8,677);
IR (KBr) νmax : 1755 (C═O of β-lactam), 1710, 1670, 1620 and 1580 cm-1 (C═O of carboxylate);
1 H NMR (200 MHz, D2 O) δ: 1.32 (d, J=6.33 Hz, 3H, CH3 CHO), 1.4-2.0 (m, 4H, CH2 -1 and 2 of propyl), 1.93 (s, CH3 CO2 H), 2.8-3.2 (m, 2H, SCH2), 3.3-3.5 (m, 6H, H-4, H-6, CH2 -3 of propyl and SCH2 CH2 N), 4.2-4.4 (m, 2H, H-5 and CH3 CHO) and 7.8 ppm (s, 1H, CH═NH).
(4R,5S,6S)-3-[(2-Guanidinoethyl)thio]-4-(3"-guanidinopropyl)-6-[(1'R)-1'-hy droxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid, acetic acid salt ##STR451##
A solution of (4R,5R,6S)-4-(3"-aminopropyl)-3-[(2-guanidinoethyl)thio]-6-[(1'R)-1'-hydro xyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid, acetic acid salt (0.300 g, 0.695 mmol) in cold water (30 mL, 0°-5°C) was adjusted to pH 8.5 with 1N aqueous sodium hydroxide and then treated with aminoiminomethanesulfonic acid (0.43 g, 3.46 mmol) added in small portions over 5 min. The pH was maintained at 8.0-8.5 throughout the addition and for another 2 h with 1M sodium hydroxide. The pH was then adjusted to 5 with glacial acetic acid and the solution was chromatographed on reversed phase silica gel (μBondapak C18, 2.5×15 cm). Elution with 0.01M aqueous acetic acid gave 0.213 g (64%) of the title carbapenem as a white amorphous solid after lyophilization: [α]22D +11.3° (c 1.0, water).
Purity by HPLC: 99% on μBondapak C18, 3.9 nm×30 cm, elution 2% CH3 CN--H2 O, pH 7.4 phosphate buffer, flow rate 1 mLin, UV detector 300 nm, retention time 10.4 min;
UV (water, pH 7.4 phosphate buffer) λmax : 302 nm (10,260);
IR (KBr) νmax : 1755 (C═O of β-lactam), 1670, 1630 and 1580 cm-1 (C═O of carboxylate);
1 H NMR (200 MHz, D2 O) δ: 1.32 (d, J=6.38 Hz, 3H, CH3 CH3 CHO), 1.4-2.0 (m, 4H, CH2 -1 and 2 of propyl), 1.92 (s, CH3 CO2 H), 2.8-3.2 (m, 2H, SCH2), 3.2-3.6 (m, 6H, H-4, H-6, CH2 -3 of propyl and SCH2 CH2 N), 4.23 (dd, JH5,H6 =2.49 Hz, JH5,H4 =9.2 Hz, 1H, H-5) and 4.27 ppm (m overlapping with H-5, 1H, CH3 CHO).
(4R,5S,6S)-6-[(1'R)-1'-Hydroxyethyl]-3-[(2-cyanoethyl)thio]-4-[2"-(L-alanyl )-aminoethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR452##
A solution of (4R,5S,6S)-6-[(1'R)-1'-hydroxyethyl]-3-[(2-cyanoethyl)thio]-4-(2"-aminoeth yl)-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-carboxylic acid (0.512 g, 1.57 mmol) in 0.2M pH 7.0 phosphate buffer (15 mL) was cooled to 0°C while bubbling Argon through the solution. The pH was adjusted to 10.2 with 1N NaOH and N-carboxyanhydride of L-alanine (0.181 g, 1.57 mmol) in dioxane (1.5 mL) was added in one portion with vigorous stirring. When the pH dropped to 7.2, it was readjusted to 10.2 and left there for 1 h. The reaction was stopped by adjusting the pH to 6.0 with 1N HCl. Argon was bubbled through the solution for 30 min at 0°C while readjusting the pH to 6.0 whenever it rose above 6∅ The crude reaction mixture was passed through a column of μBondapak C18 reverse phase silica (4.5×11.5 cm). Appropriate fractions belonging to the product were combined and lyophilized to a solid which was rechromatographed on μBondapak C18 reverse phase silica (4.5×11 cm). The slightly more polar title compound, separated very closely from the dipeptide derivative, was eluted with a mixture of water and CH3 CN (97:3, gradient elution) and was obtained as a yellow fluffy solid after lyophilization (0.099 g, 15.9%).
Purity 96.5% by HPLC: UV detection at 300 nm on μBondapak C18 (4 mm×30 cm), 5% CH3 CN in pH 6.8 phosphate buffer, flow rate 0.6 mLin, retention time 7.25 min.
UV λmax : 300;
IR (Nujol) νmax : 1750 cm-1 (C═O, β-lactam).
1 H NMR (200 MHz, D2 O) δ: 1.38 (d, 3H, CH3, J=6.4 Hz,), 1.47 (d, 3H, CH3, J=7.0 Hz), 1.52-1.77; 1.97-2.11 (m, 2H, CH2), 2.82-2.89 (overlap, 2H, CH2 CN), 2.91-3.17 (overlap, 2H, SCH2), 3.27-3.43 (overlap, 3H, CH2 N, H-4), 3.59 (dd, 1H, H-6, J5,6 =2.66 Hz, J6,1' =6.06 Hz), 3.91 (q, 1H, Cα H, Jα,CH3 =7.02 Hz), 4.74-4.96 (overlap, 2H, H-5, H-1').
(4R,5S,6S)-6-[(1'R)-1'-Hydroxyethyl]-3-[(2-cyanoethyl)thio]-4-[2"-(L-alanyl -L-alanyl)-aminoethyl]-7-oxo-1-azabicyclo-[3.2.0]hept-2-ene-2-carboxylic acid ##STR453##
A solution of (4R,5S,6S)-6-[(1'R)-1'-hydroxyethyl]-3-[(2-cyanoethyl)thio]-4-(2"-aminoeth yl)-7-oxo-1-azabicyolo-[3.2.0]hept-2-ene-2-carboxylic acid (0.512 g, 1.57 mmol) in 0.2M pH 7.0 phosphate buffer (15 mL) was cooled to 0°C while bubbling Argon through the solution. The pH was adjusted to 10.2 with 1N NaOH and N-carboxyanhydride of L-alanine (0.181 g, 1.57 mmol) in dioxane (1.5 mL) was added in one portion with vigorous stirring. When the pH dropped to 7.2, it was readjusted to 10.2 and left there for 1 h. The reaction was stopped by adjusting the pH to 6.0 with 1N HCl. Argon was bubbled through the solution for 30 min at 0° while readjusting the pH to 6.0 whenever it rose above 6∅ The crude reaction mixture was passed through a column of μBondapak C18 reverse phase silica (4.5×11.5 cm). Appropriate fractions belonging to the product were combined and lyophilized to a solid which was rechromatographed on μBondapak C18 reverse phase silica (4.5×11 cm). The slightly less polar title compound, separated very closely from the monopeptide derivative, was eluted with a mixture of water and CH3 CN (96:4, gradient elution) and was obtained as a yellowish fluffy solid after lyophilization (0.069 g, 9.4%).
Purity 96.6% by HPLC: UV detection at 300 nm on μBondapak C18 (4 mm×30 cm), 5% CH3 CN in pH 6.8 phosphate buffer, flow rate 0.6 mLin, retention time 9.1 min.
UV λmax : 300 nm.
IR (Nujol) νmax : 1750 cm-1 (C═O, β-lactam);
1 H NMR (200 MHz, D2 O) δ: 1.37 (d, 3H, CH3, J=6.45 Hz), 1.42 (d, 3H, CH3, J=7.39 Hz), 1.46 (d, 3H, CH3, J=8.85 Hz), 1.59-1.75; 1.99-2.14 (m, 2H, CH2), 2.84-2.89 (overlap, 2H, CH2 CN), 2.92-3.22 (overlap, 2H, SCH2), 3.3-3.42 (overlap, 3H, CH2 N, H-4), 3.59 (dd, 1H, H-6, J5,6 =2.56 Hz, J6,1' =5.88 Hz), 3.9 (br, 1H, Cα H), 4.25-4.34 (overlap, 3H, H-5, H-1'Cα H).
(4R,5S,6S)-4-(3"-Aminopropyl)-3-[(3-azetidinyl)thio]-6-[(1'R)-1'-hydroxyeth yl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR454##
A cold (5°C) solution of (4R,5S,6S)-4-(3"-azidopropyl)-3-[(3-azetidinyl)thio]-6-[(1'R)-1'-hydroxyet hyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid (0.235 g, 0.64 mmol) in water (75 mn) was hydrogenated over 5% Pd/Al2 O3 (0.235 g) under a pressure of 45 psi. After 1 hour, the used catalyst was replaced by some fresh catalyst (0.235 g) and the hydrogenation resumed for one additional hour. At that point, the reaction mixture was filtered, acidified to pH 5.7 with AcOH and finally chromatographed on reversed phase silica gel (Partisil) eluting with water. The material obtained after lyophilization required two additional chromatograph purifications to obtain 0.045 g (17.5%) of the title compound of good purity.
IR (Nujol) νmax : 1750 cm-1 (β-lactam);
1 H NMR (D2 O) δ: 4.00-4.15 and 4.50-4.70 (4H, 2m, 2H-2, 2H-4 of azetidine), 4.15-4 20 (3H, m, H-5, H-1'CH--S), 3.47 (1H, dd, J=2.72, J=6.33, H-6), 3.00-3.25 (3H, m, CH2 --N, H-4), 1.50-1.95 (4H, m, 2H-1", 2H-2"), 1.38 (3H, d, J=6.34, --CH3 ').
Potassium (4R,5S,6S)-4-(2"-hydroxyethyl)-6-[(1'R)-1'-hydroxy-ethyl]-3-[(imidazol-4-y l]methylthio]-7-oxo-1-azabicyclo[3.2.0]-hept-2-ene-2-carboxylate ##STR455## A. Allyl (4R,5S,6S)-6-[(1'R)-1'-tert-butyldimethylsilyloxyethyl]-4-(2"-tert-butyldi methylsilyloxyethyl)-3-[(imidazol-4-yl)methylthio]-7-oxo-1-azabicyclo-[3.2. 0]hept-2-ene-2-carboxylate ##STR456##
A solution of allyl (4R,5R,6S)-6-[(1'R)-1'-tert-butyldimethylsilyloxyethyl]-4-(2"-tert-butyldi methylsilyloxyethyl)-3,7-dioxo-1-azabicyclo[3.2.0]heptane 2-carboxylate (9.03 mmol, prepared by cyclization of 5.00 g, 9.03 mmol of diazo percursor) in dry acetonitrile (60 mL) was cooled to 0°-5° C. and treated under nitrogen with diphenyl chlorophosphate (2.1 mL, 10.1 mmol) and N,N-diisopropylethylamine (1.7 mL, 9.8 mmol) added simultaneously over 5 min. A small crystal of 4-N,N-dimethylaminopyridine was then added and the mixture was stirred for 1 h. The solution was then cooled to -20°C and then treated with more N,N-diisopropylethylamine (2.3 mL, 13.2 mmol) followed by 1.22 g (10.7 mmol) of 4(5)-(mercaptomethyl)imidazole in acetonitrile (10 mL). After 3 h at -20°C and 1 h at 0°C, the reaction mixture was diluted with ethyl acetate (500 mL), washed with saturated sodium bicarbonate, brine, dried (MgSO4) and evaporated under reduced pressure. The residue was chromatographed on silica gel (5×10 cm). Elution with a mixture of toluene and ethyl acetate (8:2) gave first 5.0 g (73%) of recovered enol phosphate. Then elution with ethyl acetate gave 1.35 g (24%) of the title compound as an oil. By 1 H NMR this material contained 25% of open product resulting from cleavage of the β-lactam by the thiol.
IR (NaCl, film) νmax : 1772 (C═O of β-lactam) and 1708 cm-1 (C═O of ester);
1 H NMR (200 MHz, CDCl3) δ: 0.5 (SiCH3), 0.9 (Si-t-Bu), 1.27 (d, J=6.13H, CH3 CHO), 1.6-2.2 (m, CH2 CH2 OSi), 3.09 (dd, JH8,H6 =2.45 Hz, JH6,H1 =6.63 Hz, H-6), 3.5-4.3 (m, H-4, H-5, SCH2, CH3 C HO, CH2 CH2 OSi), 4.7 (m, CH2 of allyl), 5.1-5.5 and 5.8-6.1 (2m, CH of allyl), 6.9 (s, H-5 of imidazole) and 7.6 ppm (s, H-2 of imidazole).
B. Allyl (4R,5S,6S)-6-[(1'R)-1'-hydroxyethyl]-4-(2"-hydroxyethyl)-3-[(imidazol-4-yl ]methylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate ##STR457##
A solution of allyl (4R,5S,6S)-6-[(1'R)-1'-tert-butyldimethylsilyloxyethyl]-4-(2"-tert-butyldi methylsilyloxyethyl)-3-[(imidazol-4-yl)methylthio]-7-oxo-1-azabicyclo[3.2.0 ]hept-2-ene-2-carboxylate (2.65 g, 4.26 mmol) in tetrahydrofuran (60 mL) was cooled to 0°-5°C and treated with glacial acetic acid (3.0 mL, 52.4 mmol) followed by 26 mL (26.0 mmol) of a 1.0M solution of tetrabutylammonium fluoride in tetrahydrofuran. The solution was then stored at 5°C for twelve days. The reaction mixture was then diluted with ethyl acetate (300 mL), washed with saturated sodium bicarbonate, brine and dried. Evaporation of the solvent under reduced pressure gave an oil which was chromatographed on a silica gel pad (5×5 cm) using a gradient of methanol (0-20%) in ethyl acetate as eluent. The product obtained (0.37 g, 20%) contained some tetrabutylammonium salt and was used as such for the deprotection step.
IR (NaCl, film) νmax : 1765 (C═O of β-lactam) and 1700 cm-1 (C═O of ester).
C. Potassium (4R,5S,6S)-4-(2"hydroxyethyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(imidazol-4-yl) methylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate ##STR458##
A solution of allyl (4R,5S,6S)-6-[(1'R)-1'-hydroxyethyl]-4-(2"-hydroxyethyl)-3-[(imidazol-4-yl )methylthio]-7-oxo-1-azabicyclo[3.2.0]-hept-2-ene-2-carboxylate (0.37 g, 0.94 mmol) in dry dichloromethane (20 mL) was treated at 22°C and under nitrogen with tetrakis(triphenylphosphine)palladium[0] and 2.1 mL (1.25 mmol) of a 0.5M solution of potassium 2-ethylhexanoate in ethyl acetate. After 1.2 h, the reaction mixture was extracted with water (2×50 mL) and the combined aqueous extract was chromatographed twice on reversed phase silica gel (μBondapak C18, 3×15 cm) using water as eluent. Lyophilization of the UV active fractions gave 0.081 g (22%) of the title carbapenem as a white amorphous solid:
Purity by HPLC: 100% on μBondapak C18, 3.9 mm×30 cm, elution pH 7.0 phosphate buffer, flow rate 1.5 mlin, UV detector 300 nm, retention time 9.04 min;
UV (water, pH 7.4 phosphate buffer) λmax : 304 nm (10,153);
IR (KBr) νmax : 1750 (C═O of β-lactam) and 1590 cm-1 (C═O of carboxylate);
1 H NMR (200 MHz, D2 O) δ: 1.30 (d, J=6.37 Hz, 3H, CH3 CHO), 1.5-2.1 (2M, 2H, CH2 CH2 OH) 3.3-3.5 (m, 2H, H-6 and H-4 overlapping), 3.5-3.8 (m, 2H, CH2 CH2 OH), 4.03 (ABq, JAB =14.6 Hz, αν=37.0 Hz, 2H, SCH2), 4.13 (dd overlapping with SCH2, JH5,H6 =2.53 Hz, JH5,H4 9.60 Hz, 1H, H-5), 4.24 (m, 1H, CH3 CHO), 7.10 (s, 1H, H-5 of imidazole) and 7.79 ppm (s, 1H, H-2 of imidazole).
(4R,5S,6S)-4-(3"-Azidopropyl)-3-[(3R)-3-pyrrolidinylthio]-6-[(1'R)-1'-hydro xyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR459## A. (3R)-N-Allyloxycarbonyl-3-hydroxypyrrolidine ##STR460##
3(R)-Hydroxypyrrolidine .HCl salt (8.0 g, 64.7 mmol) was dissolved in cold (5°C) 1N NaOH (130 mL, 130 mmol) and treated dropwise with a solution of allyl chloroformate (9.4 g, 77.7 mmol) in acetone (80 mL). The mixture was stirred for 15 min after completion of the addition and then most of the acetone evaporated. The aqueous solution was then extracted with ethyl acetate. The organic extracts were washed with brine, dried (MgSO4) and evaporated. The crude carbamate was purified by chromatography (SiO2 /Et2 O then EtOAc and CH3 CN) to yield 6.28 g (56.7%) of the title compound as a mobile oil.
IR (CH2 Cl2) νmax : 3603, 3440 (--OH), 1697 (--CO2), 1650 (>=<).
1 H NMR (CDCl3) δ: 4.8-6.1 (5H, allyl pattern), 4.48 (1H, broad s, H-3), 3.40-3.60 (4H, m, 2H-2, 2H-5), 1.80-2.10 (3H, m, 2H-4, --OH).
B. (3S)-N-Allyloxycarbonyl-3-hydroxypyrrolidine ##STR461##
A cold solution (5°C) of (3R)-N-allyloxycarbonyl-3-hydroxypyrrolidine (2.16 g, 12.62 mmol) in CH2 Cl2 was treated with pyridine (1.15 g, 14.5 mmol) and trifluoromethanesulfonic anhydride (4.09 g, 14.5 mmol). After stirring for 15 min, the solvent was evaporated, the residue triturated in diethyl ether and filtered. The filtrate was then evaporated, the crude triflate dissolved in cold (5°C) CH2 Cl2 and treated with a preformed solution of formic acid (0.87 g, 18.93 mmol) and triethylamine (1.9 g, 18.93 mmol) in CH2 Cl2. The ice bath was removed and the solution stirred at room temperature for 45 min. Then the reaction mixture was washed with cold water and brine. After drying (MgSO4), the solvent was evaporated and the crude formate purified by chromatography (SiO2 ; 10% CH3 CN in CH2 Cl2) to yield 2.13 g (84.7%). This purified material was dissolved in cold (5°C) tetrahydrofuran and 1N NaOH (11 mL, 11 mmol) was added dropwise. After stirring for 10 min, the reaction mixture was neutralized with HCl, diluted with EtOAc and washed with cold water and brine. After evaporation of the solvent, the product was chromatographed (SiO2 /EtOAc) to yield 1.51 g (82.5%) of the title compound.
IR (CH2 Cl2) νmax : 3605, 3440 (--OH), 1695 (--CO2-), 1650 cm-1 (>=<).
1 H NMR (CDCl3) δ: 4.40-6.10 (5H, allyl pattern), 4.50 (1H, m, H-3), 3.40-3.70 (4H, m, 2H-2, 2H-5), 1.90-2.10 (2H, m, 2H-4). [α]20D : +26.9 (130 mgB 100 mL, MeOH).
C. (3R) N-Allyloxycarbonyl-3-mercaptopyrrolidine ##STR462##
A cold solution (5°C) of (3S) N-allyloxycarbonyl-3-hydroxypyrrolidine (1.51 g, 8.82 mmol) in CH2 Cl2 was treated with pyridine (0.80 g, 10.14 mmol) followed by trifluoromethanesulfonic anhydride (2.86 g, 10.14 mmol). After stirring for 15 min, the solvent was evaporated, the residue triturated in diethyl ether and filtered after evaporating the filtrate, the crude triflate was redissolved in cold (5°C) CH3 CN and while bubbling H2 S into the solution, triethylamine (1.07 g, 10.58 mmol) was added dropwise. The starting material disappeared in 30 min. The solvent was then evaporated and the crude thiol purified by chromatography (SiO2 /CH2 Cl2) to yield 1.25 (75.7%) of the title compound.
1H NMR (CDCl3) δ: 4.60-6.10 (5H, allyl pattern), 3.20-3.90 (5H, m, H-3, 2H-2, 2H-5), 2.20-2.40 (1H, m, H-5), 1.80-2.00 (1H, m, H-5), 1.71 (1H, d, J=6.65, SH).
D. Allyl (4R,5S,6S)-4-(3"-azidopropyl)-3-[(3R)-N-(allyloxycarbonyl]-3-pyrrolidinylt hio]-6-[(1'R)-1'-hydroxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carbox ylate ##STR463##
A cold (5°C) solution of allyl (4R,5S,6S)-4-(3"-azidopropyl)-3-(diphenylphosphono)-6-[(1'R)-1'-hydroxyeth yl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate (1.85 g, 3.25 mmol) in DMF (35 mL) was treated with (3R) N-allyloxycarbonyl-3-mercaptopyrrolidine (1.25 g, 6.68 mmol) followed by diisopropylethylamine (0.863 g, 6.68 mmol). The ice bath was removed and after stirring at room temperature for 15 h, the solution was diluted with diethyl ether (90 mL) and washed three times with cold brine. After drying (MgSO4) the organic solution was evaporated and the crude carbapenem purified by chromatography (SiO2, 30% CH3 CN in CH2 Cl2) to yield 1.27 g (77.1%) of the title compound.
IR (CH2 Cl2) νmax : 3610 (--OH) 2105 (--N3) 1778 (β-lactam), 1700 (--CO2-), 1650 cm-1 (>=<).
1 H NMR (CDCl3) δ: 4.5-6.10 (10H, 2 allyl patterns), 4.15-4.30 (2H, m, H-5, H-1), 3.70-3.90 (2H, m, H-4, C--S--), 3.10-3.70 (7H, m, H-6, --CH2 N3, --(CH2)2 N--), 1.40-2.40 (6H, m, 2H-1", 2H-2", 2H-4 of pyrrolidine), 1.40 (3H, d, J=6.23, --CH3 ').
E. (4R,5S,6S)-4-(3"-Azidopropyl)-3-[(3R)-3-pyrrolidinylthio]-6-[(1'R)-1'-hydr oxyethyl]-7-oxo-1-azabicyclo-[3.2.0]hept-2-ene-2-carboxylic acid ##STR464##
A cold (5°C) solution of allyl (4R,5S,6S)-4-(3"-azidopropyl)-3-[(3R)-N-(allyloxycarbonyl]-3-pyrrolidinylt hio]-6-[(1'R)-1'-hydroxyethyl]-7-oxo-1-azabicyclo[3.2.0]-hept-2-ene-2-carbo xylate (0.932 g, 1.84 mmol) in EtOAc (50 mL) was treated with 0.5M sodium ethylhexanoate (11.04 mL, 5.52 mmol) and (PPh3)4 Pd (0.90 g). The solution was stirred for 20 h at 5°C then diluted with EtOAc and extracted with cold water. The aqueous extracts were acidified to pH ∼7.0 with AcOH and chromatographed on reversed phase silica gel (partisil). Elution was done with 0-25% CH3 CN in water to yield 15 mg (2.1%) of the title compound. [The major product isolated was the corresponding mono deprotected ester, (31%)].
1 H NMR (D2O) δ: 4.20-4.40 (2H, m, H-5, H-1'), 3.95 (1H, m, --CH--S), 2.96-3.42 (1H, m, H-4), 3.1-3.42 (7H, m, H-6, --CH2 N3, --(CH2)2 N--), 1.50-2.50 (6H, m, 2H-1", 2H-2", 2H-4 of pyrrolidine), 1.33 (3H, d, J-6.37, --CH3 ').
(4R,5S,6S)-4-(3"-Aminopropyl)-3-[(3R)-3-pyrrolidinylthio]-6-[(1'R)-1'-hydro xyethyl]-7-oxo-1-azabicyclo[3.3.0]hept-2-ene-2-carboxylic acid ##STR465##
A solution of (4R,5S,6S)-4-(3"-azidopropyl)-3-[(3R)-3-pyrrolidinylthio]-6-[(1'R)-1'-hydr oxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid (0.54 g, 0.142 mmol) in cold water (15 mL) was hydrogenated at 5°C for 1 h at 60 psi of hydrogen in the presence of 5% Pd/Al2 O3 (60 mg). Then the catalyst was filtered off and the filtrate acidified to pH=5.5 with acetic acid. Chromatography on reversed phase silica gel (partisil) of this acidified solution gave 30 mg (50.9%) of the title compound as its acetic acid salt.
IR (Nujol) νmax : 1750 cm-1 (β-lactam), 1590 (--CO2-1).
1 H NMR (D2 O) δ: 4.20-4.40 (2H, m, H-5, H-1'), 3.90-4.10 (1H, m, --CH--S), 3.60-3.70 (1H, m, H-4), 3.20-3.50 (5H, m, H-6, (--CH2)2 N--), 3.05 (2H, m, CH2 --N--), 1.50-2.60 (6H, m, 2H-1", 2H-2", 2H-4 of pyrrolidine), 1.33 (3H, s, J=6.40, --CH31), 1.92 (3H, s, acetic acid).
Potassium (4R,5S,6S)-4-(2"-azidoethyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(imidazol-4-yl)m ethylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate ##STR466## A. Allyl (4R,5S,6S)-4-(2"-azidoethyl)-6-[(1'R)-1'-tert-butyldimethylsilyloxyethy -3-[(imidazol-4-yl)methylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene2-carbox ylate ##STR467##
A solution of allyl (4R,5R,6S)-4-(2"-azidoethyl)-6-[(1'R)-1'-tert-butyldimethylsilyloxyethyl]- 3,7-dioxo-1-azabicyclo[3.2.0]heptane-2-carboxylate (10.7 mmol, prepared by cyclization of 5.0 g, 10.7 mmol of diazo precursor) in dry acetonitrile (75 mL) was cooled to 0°-5°C and treated with diphenyl chlorophosphate (2.45 mL, 11.8 mmol) and N,N-diisopropylethylamine (2.06 mL, 11.8 mmol) added simultaneously over 5 min. A small crystal of 4-N,N-dimethylaminopyridine was added and the mixture was stirred for 1 h. The mixture was then cooled to -20°C and treated with more N,N-diisopropylethylamine (2.06 mL, 11.8 mmol) followed by a solution of 4(5)-(mercaptomethyl)imidazole (1.50 g, 13.1 mmol) in acetonitrile (10 mL). The solution was slowly warmed up to 0°-5°C and stirred for 3 h. The reaction mixture was then diluted with ethyl acetate (300 mL) washed with saturated sodium bicarbonate, brine and dried (MgSO4). The solvent was evaporated under reduced pressure and the residue was chromatographed on silica gel (5×10 cm). Elution with a mixture of toluene and ethyl acetate (8:2) first gave 3.38 g (47%) of intermediate enol phosphate. Further elution with ethyl acetate gave 1.45 g (25%) of the title compound as an oil.
IR (NaCl, film) νmax: 2100(N3) and 1765 cm-1 (C═O of β-lactam).
Allyl (4R,5S,6S)-4-(2"-azidoethyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(imidazol-4-yl)m ethylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate ##STR468##
A solution of allyl (4R,5S,6S)-4-(2"-azidoethyl)-6-[(1'R)-1'-tert-butyldimethylsilyloxyethyl)- 3-[(imidazol-4-yl)methylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxy late (1.45 g, 2.72 mmol) in tetrahydrofuran (40 mL) was cooled to 0°-5°C and treated with acetic acid (1.0 mL, 17.5 mmol) followed by 8.2 mL (8.2 mmol) of 1.0M tetrabutylammonium fluoride in tetrahydrofuran. After fourteen days at 0°-5°C, the reaction mixture was diluted with ethyl acetate (400 mL), washed with saturated sodium bicarbonate, brine and dried (MgSO4). The solvent was evaporated under reduced pressure and the residue was chromatographed on silica gel (4×6 cm). Elution with a gradient of methanol (0-20%) in ethyl acetate gave 0.34 g (30%) of the title compound as an oil.
IR (NaCl, film) νmax : 2100 (N3), 1765 (C═O of β-lactam) and 1700 cm-1 (C═O of ester);
1 H NMR (200 MHz, CDCl3) δ: 1.38 (d, J=6.25 Hz, 3H, CH3 CHO), 1.5-2.1 (m, CH2 CH2 N3), 3.15 (dd, JH6,H5 =2.63 Hz, JH6,H1 =7.72 Hz, 1H, H-6), 3.3-3.7 (m, 3H, H-4 and CH2 CH2 N3 overlapping), 4.06 (ABq, JAB =14.6 Hz, Δν=45.2 Hz, 2H, SCH2), 4.1-4.4 (m, 2H, H-5 and CH3 CHO overlapping), 4.6-4.9 (m, 2H, CH2 of allyl), 5.2-5.5 and 5.9-6.1 (2m, 2H, and 1H, CH of allyl), 6.98 (s, 1H, H-5 of imidazole) and 7.59 ppm (s, 1H, H-2 of imidazole).
C. Potassium (4R,5S,6S)-4-(2"-azidoethyl]-6-[(1'R)-1'-hydroxyethyl)-3-[(imidazol-4-yl]m ethylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate ##STR469##
A solution of allyl (4R,5S,6S)-4-(2"-azidoethyl)-6-[(1'R)-1'-hydroxyethyl]-3-[(imidazol-4-yl)m ethylthio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate (0.304 g, 0.81 mmol) in dichloromethane (20 mL) was treated at 25°C and under nitrogen with tetrakis(triphenylphosphine)palladium[0](0.040 g) and 1.8 mL (0.9 mmol) of a 0.5M solution of potassium 2-ethylhexanoate in ethyl acetate. After 1.2 h, the reaction mixture was extracted with water (2×50 mL) and the combined extract was chromatographed on reversed phase silica gel (μBondapak C18, 2.5×15 cm). The column was eluted with a gradient of acetonitrile (0-5%) in 0.01M pH 7.0 phosphate buffer. The UV active fractions were collected, concentrated and desalted on the same column using water instead of buffer as eluent. Lyophilization of the pertinent fractions gave 0.047 g (14%) of the title carbapenem as a white amorphous solid:
Purity by HPLC: 99% on μBondapak C18, 3.9 mm×30 cm, elution 10% CH3 CN-- water pH 7.4 phosphate buffer, flow rate 1 mLin, UV detector 302 nm, retention time 6.83 min;
UV (water, pH 7.4 phosphate buffer) λmax : 304 nm (8,380);
IR (KBr) νmax : 2100 (N3), 1745 (C═O of β-lactam) and cm-1 (C═O of carboxylate);
1 H NMR (200 MHz, D2 O) δ: 1.31 (d, J=6.40 Hz, 3H, CH3 CHO), 1.6-2.1 (m, 2H, CH2 CH2 N3), 3.2-3.6 (m, 4H, H-6, H-4 and CH2 CH2 N3 overlapping), 4.03 (ABq, JAB =14.52 Hz, Δν=33.6 Hz, 2H, SCH2), 4.14 (dd, JH5,H6 =2.42 Hz, JH5,H4 =9.48 Hz, 1H, H-5), 4.24 (m, 1H, CH3 CHO), 7.09 (s, 1H, H-5 of imidazole) and 7.72 ppm (s, 1H, H-2 of imidazole).
(4R,5S,6S)-4-[3"-Amino-(2" R or S)-2"-hydroxypropyl]-3-[(2-cyanoethyl)thio]-6-[(1'R)-1'-hydroxyethyl]-7-ox o-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR470## A. (Pyridin-2-yl)methylthio-5-azido-4-(tert-butyldimethylsilyloxy)pentanoate ##STR471##
To a cold (ice bath) solution of 5-azido-4-(tert-butyldimethylsilyloxy)pentanoic acid (38 g, 0.14 mmol) from iodolactonization described by P. A. Bartlett et al in J. Am. Chem. Soc. 100, 3950 (1978) in dimethyl formamide (250 mL) was added 2-picolyl mercaptan (17.5 g, 0.140 mol), 1,3-dicyclohexylcarbodiimide (30 g, 0.15 mol) and 1-hydroxybenzotriazole (10 g, 0.074 mol). The mixture was stirred for 60 h in the cold room (5°-8°C), diluted with water (1 L) and extracted with diethyl ether (5×250 mL). The diethyl ether extracts were combined, washed with water (5×250 mL), brine (200 mL), dried and passed through a silica gel flash pad (500 g, Hexane, 5→30% ethyl acetateexane) to give the title compound (30 g, %) as an oil.
IR (film) νmax : 2100 (N3) and 1690 cm-1 (C═O).
1 H NMR (CDCl3, 200 MHz) δ: 8.558-8.525 (1H, m, pyridine H-6), 7.672=7.586 (1H, m, pyridine H-4), 7.336 (1H, d, J=7.9 Hz, pyridine H-3), 7,199-7.131 (1H, m, pyridine H-5), 4.257 (2H, s, CH2 S, 3.834 (1H, center of 5 lines, J=5.41-2, CHO), 3.197 (2H, center of ABX, J=4.5 Hz, J=5.4 Hz, J=12.5 Hz, CH2 N3), 2.659 (2H, t, J=7.6 Hz, CH2 CO), 2.01-1.786 (2H, m, CH2), 0.893 (9H, s, tert-butyl), 0.094 and 0.061 ppm (6H, 2s, dimethyl).
B. (3S,4S)-3-[(1'R)-1'-tert-Butyldimethylsilyloxyethyl]-4-[(1"R)-1"-(pyridin- 2-yl)methylthiocarbonyl-4"-azido-(3"R and S)-3"-tert-butyldimethylsilyloxy]butyl]-azetidin-2-one ##STR472##
A cold (ice-methanol bath) solution of (pyridin-2-yl)-methylthio-5-azido-4-(tert-butyldimethylsilyloxy)pentanoate (30 g, 78.9 mmol) in dichloromethane (500 mL) was treated with triethylamine (35 mL, 0.25 mol) and dropwise with tert-butyldimethylsilyltrifluoromethanesulfonate (46 mL, 0.20 mmol). At the end of the addition, the mixture was allowed to stand for 18 h at 5°-8°C, then diluted with hexane (1 L), washed with water (5×500 mL), brine (500 mL), dried (MgSO4) and treated with activated charcoal. The residue (20 g, 51%, 0.040 mmol), a red oil, was added to a cold (ice bath) mixture of freshly fused zinc chloride (13 g, 0.096 mol), and (3 S,4 R)-4-acetoxy-3-[(1' E)-1'- tert-butyl-dimethyl-silyloxyethyl] azetidin-2-one (20 g, 0.069 mol) in dichloromethane (250 mL). It was allowed to stand in a cold room for 18 h, diluted with diethyl ether (11), washed with saturated aqueous NH4 Cl (3×250 mL), water (3×250 mL), ice cold saturated aqueous NaHCO3, water (250 mL), brine (250 mL) and dried (MgSO4). The residue was passed through a silica gel flash column (500 g, Hexane→50% ethyl acetateexane) to give the title compounds as separated diastereomers (30 g of each diastereomers, 24% combined yield).
Isomer 1
Rf=0.33 (hexane/ethyl acetate:1/1);
IR (film) νmax : 3300-3200 (NH), 2700 (N3), 1765 and 1680 cm-1 (C═O);
1 H NMR (CDCl3, 200 MHz) δ: 8.54-8.51 (1H, m, pyridine-H6), 7.64-7.58 (1H, m, pyridine H-4), 7.314 (1H, d, J=7.8 Hz, pyridine H-3), 7.21-7.14 (1H, m, pyridine H-5), 5.845 (1H, bs, NH), 4.280, 4.269 (2H, 2 lines, part of ABq, CH2 S), 4.2-4.05 (1H, m, CHO), 3.832 (1H, dd, J=2.05 Hz, J=6.0 Hz, H-4), 3.83-3.70 (1H, m, CHO), 3.227 (2H, ABX, J=4.6 Hz, J=5.1 Hz, J=12.5 Hz, CH2 N3), 3.08-2.95 (2H, m, H-3 and H-1"), 2.15-1.98, 1.67-1.55 (2H, m, CH2 -1"), 1.025 (3H, d, J=6.3 Hz, CH3), 0.883, 0.868 (18H, 2s, tert-butyl), 0.070 and 0.047 ppm (3H and 5H, 28, dimethyl.
Isomer 2
Rf=0.42 (hexane/ethyl acetate: 1/1);
IR (film) νmax : 3250 (NH), 2100 (N3), 1765 and 1685 cm-1 (C═O);
1 H NMR (CDCl3, 200 MHz) δ: 8.55-8.52 (1H, m, pyridine H-6), 7.67-7.58 (1H, m, pyridine H-4), 7.32 (1H, d, J=7.8 Hz, pyridine H-3), 7.21-7.14 (1H, m, pyridine H-5), 5.90 (1H, bs, NH), 4.336, 4.267, 4.245, 4.174 (2H, ABq, J=14.0 Hz, CH2 S), 4.20-4.13 (1H, m, CHO), 3.794 (1H, dd, J=2.1 Hz, J=6.9 Hz, H-4), 3.82-3.75 (1H, m, CHO), 3.207 (2H, ABX, J=3.8 Hz, J=5.2 Hz, J=12.8 Hz, CH2 S), 3.048 (1H, bt, J=2.5 Hz, H-3), 2.86-2.75 (1H, m, H-1"), 2.10-1.96, 1.85-1.70 (2H, 2 sets of m, CH2 -4), 1.050 (3H, d, J=6.3 Hz, CH3), 0.883, 0.857 (18H, 2s, tert-butyl) and 0.047 ppm (12H, s, dimethyl).
C. (3S,4S)-3-[(1'R)-1'-tert-Butyldimethylsilyloxyethyl]-4-[(1"R)-1"-carboxy-4 "-azido-(3" R or S)-3"-tert-butyldimethylsilyloxybutyl]azetidin-2-one ##STR473##
A cold (ice bath) solution of (3 S,4 S)-3-[(1' R)-1'-tert-butyldimethylsilyloxyethyl]-4-[(1" R)-1"-(pyridin-2-yl)methylthiocarbonyl-4"-azido-(3" R or S)-3"-tert-butyldimethylsilyloxy)butyl]-azetidin-2-one (2.38 g, 3.9 mmol) in tetrahydrofuran (25 mL) was treated with 30% aqueous hydrogen peroxide (1.3 mL, 15.6 mmol), followed by the slow addition of 1M aqueous NaOH (11.7 mL, 11.7 mmol). The mixture was stirred for 30 min, then acidified with 1N aqueous HCl (14 mL) and extracted with ethyl acetate (3×30 mL). The organic extracts were combined, washed with water (2×20 mL), 1M aqueous NaHSO3 (2×20 mL), water (30 mL), brine and dried (MgSO4) to give the title compound (1.8 g, 92%) as an oil.
IR (CH2 Cl) νmax : 3400 (NH), 2100 (N3), 1765, 1740 and 1710 cm-1 (C═O); 1H NMR (CDCl3, 200 MHz) δ: 6.329 (1H, bs, NH), 4.23-4.14 (1H, m, CHO), 3.867 (1H, dd, J-2.2 Hz, J=6.4 Hz, H-4), 3.26 (2H, center of ABX, J=4.2 Hz, J=4.7 Hz, J=12.7 Hz, CH2 N3), 3.13 (1H, center of m, H-3), 2.70-2.60 (1H, m, H-1"), 2.04-1.7 (2H, m, CH2 -1"), 1.171 (3H, d, J=6.3 Hz, CH3), 0.898, 0.869 (18H, 2s, tert-butyl), 0.109, 0.099, 0.070 and 0,062 ppm (12H, 4s, CH3).
D. (3S,4R)-3-[(1'R)-1'-tert-Butyldimethylsilyloxyethyl]-4-[(1"R)-1"-(4-azido- (3 R or S)-3-tert-butyldimethylsilyloxypropyl)-3"-allyloxycarbonyl-2"-oxopropyl]-a zetidin-2-one ##STR474##
A solution of (3S,4S)-3-[(1' R)-1'- tert-butyldimethylsilyloxyethyl]-4-[(1"R)-1"-carboxy-4"-azido-(3" R or S)-3"-tert-butyldimethylsilyloxybutyl]azetidin-2-one (1.8 g, 3.6 mmol) in toluene (25 mL) was treated with carbonyldiimidazole (642 mg, 3.96 mmol) and then stirred for 1.5 h. The solvent was removed and the residue was dissolved again in toluene. The solvent was removed again and the residue was dried under high vacuum. To this resulting acyl imidazole was added a pre-dried solution (heated for 2.5 h over 3A° and 4A° mole sieves) of magnesium monoallyl malonate (4.5 g, 14.4 mmol) in benzene (40 mL). The mixture was heated for 1.6 h (bath temp. 75°C), diluted with a 1 mixture of diethyl ether and ethyl acetate, washed with ice cold water (2×40 mL) ice cold 1N aqueous HCl (40 mL), water (2×40 mL) brine 40 mL and dried (MgSO4) to give crude title compound (2.29 g,>100%) which was used as such in the next step.
IR (CH2 Cl2) νmax : 3420 (NH), 2120 (N3), 1770 (C═O β-lactam), 1720, 1660 and 1630 cm-1 (C═O);
1 H NMR (CDCl3, 200 MHz) δ: 12.113 (0.5H, bs, OH enol), 6.03-5.80 (1H, m, vinylic H) 5.927 (1H, bs, NH), 5.387-5.253 (2H, m, vinylic H), 5.058 (2.6H, s, olefinic H of enol), 4.665-4.616 (2H, m, allylic H), 4.24-4.12, 3.883-3.764 (2H, m, H-4 and H-1'), 3.775, 3.764 (d, J=2.1 Hz, part of H-4), 3.680, 3.600, 3.592, 3.513 (2H, ABq, J=15.9 Hz, CH2 of acetoacetate), 3.357-3.269 (1H, m, part of CH2 N3), 3.187-3.01 (2H, m, H-1" and part of CH2 N3), 2.955 (0.5 H, dd, J=2.1 Hz, J=4.1 Hz, H-3), 2.905 (0.5 H, dt, J=2.6 Hz, part of H-3), 2.256-2.146, 2.065-1.91, 1,836-1.6 (2H, 3 series of m, CH2 -4), 1,180 (1.4 H, d, J=6.2 Hz, CH3), 1.086 (1.6 H, d, J=6.3 Hz, CH3)), 0,896 and 0.866 (18H, 2s, tert-butyl), 0.108, 0.091, 0.087, 0,069 and 0.056 ppm (12H, 5s, dimethyl).
E. (3S,4R)-3-[(1'R)-1'-tert-butyldimethylsilyloxyethyl]-4-[(1"R)-1"-(4-azido- (3 R or S)-3-tert-butyldimethylsilyloxypropyl]-3"-diazo-3"-allyloxycarbonyl-2"-oxo propyl]azetidin-2-one ##STR475##
A cold (ice bath) solution of (3 S,4 R)-3-[(1' R)-1'- tert-butyldimethylsilyloxyethyl]-4-[(1" R)-1"-(4-azido-(3 R or S)-3- tert-butyldimethylsilyloxypropyl)-3"-allyloxylcarbonyl-2"-oxopropyl]azetid in-2-one (2.2 g, 3.6 mmol) in CH3 CN (22 mL) was treated first with triethylamine (0.51 mL, 3.6 mmol) and dropwise with tosyl azide (709 mg, 3.6 mL) in CH3 CN (3 mL). The mixture was stirred for 1.5 h and the solvent was removed under vacuum. The residue was triturated with hexane and the solid tosyl amid, was removed by filtration and washed with hexane. The residue upon evaporation of the hexanes fractions was passed through a silica gel flash column (60 g, hexane, 10→40% etherexane) to give the title compound (650 mg, 30%) as an oil.
IR (CH2 Cl2) νmax : 3410 (NH), 2150 (N2), 2100 (N3), 1765 (C═O β-lactam), 1715 and 1650 cm-1 (C═O);
1 H NMR (CDCl3, 200 MHz) δ: 6.03 -5.832 (1H, m, vinylic H), 5.862 (1H, bs, NH), 5.40-5.29 (2H, m, vinylic H), 4.72-4.689 (2H, m, CH2 allylic), 4.215-4.07 (2H, m, CHO and H-1'), 3.805-3.71 (1H, m, H-1"), 3,189 (2H, ABX, J=3.9 Hz, J=5.5 Hz, J=12.7 Hz, CH2 N3), 3.023 (1H, bt, J=2.5 Hz, H-3), 2.175-2.03, 1.73-1.57 (2H, 2 sets of m, CH2 -1"), 1.162 (3H, d, J=6.4 Hz, CH3), 0.891, 0.865 (18H, 2s, tert-butyl), 0.094, 0.062 and 0.053 ppm (12H, 3s, dimethyl).
F. Allyl (4R,5R,6S)-4-[3"-azido-(2"R or S)-2"-tert-butyldimethylsilyloxypropyl)-6-[(1'R)-1'-tert-butyldimethylsily loxyethyl]-3,7-dioxo-1-azabicyclo[3.2.0]-heptan-2-carboxylate ##STR476##
A solution of (3S,4R)-3-[(1' R)-1'- tert-butyldimethylsilyloxyethyl]-4-[(1" R)-1"-[4-azido-(3R or S)-3- tert-butyldimethylsilyloxypropyl]-3"-diazo-3"-allyloxycarbonyl-2"-oxopropy l]azetidin-2-one (690 mg, 1.1 mmol) in benzene (20 mL) was heated under reflux in the presence of Rh(OAc)2 (17 mg) for 45 min. More catalyst (17 mg) was added and the heating period was continued for 30 more min. The catalyst was removed by filtration and benzene was removed under vacuum to give the title compound (700 mg, 100%) as an oil.
IR (CH2 Cl2) νmax : 2110 (N3), 1770 and 1745 cm-1 (C═O);
1 H NMR (CDCl3, 200 MHz) δ: 6.0-5.79 (1H, m, vinylic H), 5.38-5.24 (2H, m, vinylic H), 4.72 -4.88 (2H, m, allylic CH2), 4,633 (1H, s, CH-2), 4.58-4.28 (1H, m, H-1'), 4.325 (1H, dd, J=2.5 Hz, J=8.4 Hz, H-5), 3.91-3.82 (1H, m, CHO) 3.40-3.2 (2H, m, CH2 N3), 3.246 (1H, dd, J=2.5 Hz, J=4.3 Hz, H-6), 2.839 (1H, bq, J=7.9 Hz, H-4), 1.84-1.72 (2H, m, CH2 -4), 1.270 (3H, d, J=6.2 Hz, CH3), 0.897 (18H, s, tert-butyl), 0.112, 0,099, 0.092 and 0,083 ppm (12H, 4s, dimethyl).
G. Allyl (4R,5S,6S)-4-[3"-azido-("2R or S)-2"-tert-butyldimethylsilyloxypropyl]-6-[(1'R)-1'-tert-butyldimethylsily loxyethyl]-3-[(2-cyanoethyl)thio]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-car boxylate ##STR477##
A cold (ice-methanol bath) solution of allyl (4 R,5 S,6 S)-4-[3"-azido-(2" R or S)-2- tert-butyldimethylsilyloxypropyl]-6-[(1 R)-1'- tert-butyldimethylsilyloxyethyl]-3,7-dioxo-1-azabicyclo[3.2.0]hept-2-ene-2 -carboxylate (from 690 mg, 1.1 mol of diazo) in CH3 CN (8 mL) was treated dropwise with diphenyl chlorophosphate (0.26 mL, 1.32 mmol) and diisopropylethyl amine (0.23 mL, 1.32 mmol) and a trace amount of 4-N,N-dimethylaminopyridine (20 mg). The mixture was stirred for 1 h and then two portions of cyanoethyl mercaptan (130 mg, 1.5 mmol and 52 mg, 0.60 mmol) and diisopropylethyl amine (0.26 mL, 1.50 mmol and 0.10 mL, 0.60 mmol) were successively added within 1 h period. The mixture was stirred for 1.5 h, diluted with ethyl acetate (25 mL), washed with ice cold water (3×10 mL), 1M aqueous NaHSO3 (3×10 mL), water (2×10 mL), 1N aqueous HCl (10 mL), water (2×10 mL), 1M aqueous NaHCO3 (10 mL), water (10 mL), brine (10 mL) and dried (MgSO4). The residue was passed through a silica gel flash column (25 g, petroleum ether, 10→40% diethyl etheretroleum ether) to give the title compound (442 mg, 62%) as an oil.
IR (CH2 Cl2) νmax : 2250 (CN), 2110 (N3), 1775 (C═O β-lactam), 1710 cm (C═O);
1 H NMR (CDCl3, 200 MHz) δ: 6.03-5.84 (1H, m, vinylic H), 5.48-5.20 (2H, m vinylic H), 4.85-4.6 (2H, m, allylic CH2), 4.38-4.3 (1H, m H-1), 4.284 (1H, dd, J=2.5 Hz, J=9.5 Hz, H-5), 3.65-3.50 (1H, m, CHO), 3.47-2.93 (5H, m, H-4, CH2 N3, SCH2), 3.205 (1H, dd, J=2.5 Hz, J=6.4 Hz, H-6), 2.699, 2.664, 2.632 (2H, m, CH2 CN), 1.90-1.75 (2H, m, CH2 -4), 1.245 (3H, d, J=6.2 Hz, CH3), 0.935 and 0.898 (18H, 2s, tert-butyl), 0.143 and 0.091 (12H, 2s, dimethyl).
H. Allyl (4R,5S,6S)-4-[3"-azido-(2"R or S)-2"-hydroxypropyl]-6-[(1'R)-1'-hydroxyethyl]-3-[(2-cyanoethyl)thio]-7-ox o-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate ##STR478##
A cold (ice-methanol bath) solution of allyl (4 R,5 S,6 S)-4-[3"-azido-(2" R or S)-2"- tert-butyldimethylsilyloxy-propyl]-6-[(1' R)-1'- tert-butyldimethylsilyloxyethyl]-3-[(2-cyanoethyl)thio]-7-oxo-1-azabicyclo [3.2.0]-hept-2-ene-2-carboxylate (440 mg, 0.68 mmol) in tetrahydrofuran (6 mL) was treated with glacial acetic acid (0.94 mL, 17 mmol) and dropwise with a 1M tetrabutylammonium fluoride solution in tetrahydrofuran (6.8 mL, 6.8 mmol). The mixture was stirred for 15 days at 8°C, then diluted with ethyl acetate (40 mL), washed with ice cold water (4×10 mL), 1M aqueous NaHCO3 (2×10 mL), water (10 mL), brine and dried (MgSO4). The residue was applied on preparative silica gel plate (ethyl acetateexane: 4/1) to give the title compound (185 mg, 65%) as an oil.
IR (CH2 Cl2) νmax : 3600, 3450 (OH), 2250 (CN), 2110 (N3), 1775 (C═O β-lactam) and 1710 cm-1 (C═O);
1 H NMR (CDCl3, 200 MHz) 8:6.04-5.87 (1H, m, vinylic H), 5,493-4.24 (2H, m, vinylic H), 4.88-4.64 (2H, m, allylic H), 4.294 (1H, dd, J=2.6 Hz, J=9.7 Hz, H-5), 4.3-4.17 (1H, m, H-1'), 3.9-3.67 (2H, m, CHO and H-4), 3.382, 3.353 (2H, 2 lines, CH2 N3), 3.35-3.23 (1H, m, 1 proton of SCH2), 3.159 (1H, dd, J=2.6 Hz, J=8.0 Hz, H-6), 3.05-2.91 (1H, m, 1 proton of SCH2), 3.91 (1H, bs, OH), 2.81-2.63 (2H, m, CH2 CN), 2.377 (1H, bs, OH), 1.94-1.64 (2H, m, CH2 -4) and 1.388 ppm (3H, d, J=6.2 Hz, CH3).
I. Sodium (4R,5S,6S)-4-[3"-azido-(2"R or S)-2"-hydroxypropyl]-6-[(1'R)-1'-hydroxyethyl]-3-[(2-cyanoethyl)thio]-7-ox o-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate ##STR479##
A cold (ice bath) solution of allyl (4 R,5 S,6 S)-4-[3"-azido-(2" R or S)-2"-hydroxypropyl]-6-[(1' R)-1'-hydroxyethyl]-3-[(2-cyanoethyl)thio]-7-oxo-1-azabicyclo[3-2.0]-hept- 2-ene-2-carboxylate (180 mg, 0.43 mmol) in CH2 Cl2 (7 mL) was treated with Pd(PPh3)4 and dropwise with N-methylaniline (0.11 mL, 0.86 mmol). The mixture was stirred for 30 min then diluted with a 0.1M pH 7.0 aqueous phosphate buffer (10 mL) and diethyl ether (20 mL). The organic layer was extracted with more pH 7.0 buffer (2×5 mL) and water (5 mL). The aqueous layers were combined, washed with diethyl ether and passed through a μBondapak C18 reversed phase column (50 g, water→2% CH3 CNater) to give the title compound (105 mg, 61%) as a lyophilized powder.
IR (Nujol) νmax : 3500-3100 (OH), 2100 (N3), 1745 (C═O β-lactam) and 1595 cm (C═O);
1 H NMR (D2 O, 200 MHz) δ: 4.343, 4.33 (d, J=2.5 Hz, part of H-5), 4.35-4.21 (2H, m, H-1' and H-5), 3.9-3.8 (1H, m, CHO), 3.679-3.583 (1H, m, H-4), 3.435, 3.422 (part of H-6, d, J=2.5 Hz), 3.48-3.31 (3H, m, H-6 and CH2 N3), 3.257-3.134, 3.087-2.91 (2H, 2 sets of m, SCH2), 2.91-2.83 (2H, m, CH2 CN), 1.99-1.876, 1.783-1.655 (2H, 2 sets of m, CH2 -4) and 1.321 ppm (3H, d, J=6.4 Hz, CH3).
J. (4R,5S,6S)-4-[3"-Amino-(2"R or S)-2"-hydroxypropyl]-6-[(1'R)-1'-hydroxyethyl]-3-[(2-cyanoethyl)thio]-7-ox o-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR480##
A cold (ice bath) solution of sodium (4 R,5 S,6 S)-4-[3"-azido-(2" R or S)-2"-hydroxypropyl]-6-[(1' R)-1'-hydroxyethyl]-3-[(2-cyanoethyl)thio]-7-oxo-1-azabicyclo[3.2.0]-hept- 2-ene-2-carboxylate (105 mg, 0.26 mmol) in water (20 mL) was shaken on a Parr hydrogenator for 1 h at 45-50 psi of hydrogen, using 5% Pdlumina as catalyst. The catalyst was removed by filtration and washed with water (2×2 mL). The pH of the aqueous reaction mixture was adjusted to 7.05 with a 0.1M aqueous NaH2 PO4 solution. The neutralized solution was passed through a μBondapak C18 reversed phase column (50 g, water) to give the title compound (65 mg, 43%) as a white lyophilized powder.
Purity: 98.2% as determined by HPLC (r.t.=5.92 min, μBondapak C18, 10μ, KH2 PO4 0.01M, pH 7.4);
UV (water) λmax : 300 (8008);
IR (Nujol) νmax : 3600-3100 (OH, NH2), 2250 (CN), 1750 (C═O β-lactam) and 1590 cm-1 (C═O);
1 H NMR (D2 O, 200 MHz) δ: 4.312 (1H, dd, J=2.8 Hz, J=9.7 Hz, H-5), 4.32-4.207 (1H, m, H-1'), 3.948-3.849 (1H, m CHO), 3.68-3.575 (1H, m, H-4), 3.380 (1H, dd, J=2.8 Hz, J=6.6 Hz, H-6), 3.235, 3.219, 3.169, 3.154 (1H, part of ABX, J=3.1 Hz, J=13.2 Hz, CH2 N3), 3.23-3.11 (1H, m, 1 proton of SCH2), 3.008-2.95 (2H, m, part of CH2 CN and part of SCH2), 2.88-2.82 (2H, m, CH2 CN), 2.002-1.699 (2H, m, CH2 -4) and 1.328 ppm (3H, d, J=6.4 Hz, CH3).
(4R,5S,6S)-6-[R]-1'-Hydroxyethyl]-3-benzylthio-4-[2"-(N-benzyl-N-methyl)ami noethyl]-7-oxo-1-azabicyclo[3.2.0]-hept-2-ene-2-carboxylic acid ##STR481## A. Allyl (4R,5S,6S)-6-[(1'R)-1'-(tert-butyldimethylsilyloxy-ethyl)]-3-benzylthio-4- [2"-tert-butyldimethylsilyloxyethyl)]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2 -carboxylate ##STR482##
A cold (0°C) solution of allyl (4R,5S,6S)-6-[(1'R)-1'-(tert-butyldimethylsilyloxyethyl)]-4-[2"-tert-butyl dimethylsilyloxyethyl]-3,7-dioxo-1-azabicyclo[3-2.0]heptane-2-carboxylate (4.75 g, 9.03 mmol) in CH3 CN (50 mL) was treated with ClPO(OPh)2 (2.06 mL, 9.93 mmol) followed by N,N-diisopropylethylamine (1.73 mL, 9.93 mmol) and 4-N,N-dimethylaminopyridine (10 mg). The mixture was stirred at 0°C for 2.5 h, under Argon, after which Argon was bubbled through the solution for 10 min. The enol-phosphate was then treated with benzylmercaptan (2.54 mL, 21.58 mmol) followed by N,N-diisopropylethylamine (3.8 mL, 21.68 mmol) and stirred at 0°C for 20 h. The reaction mixture was diluted with EtOAc (300 mL) and washed successively with cold 1M NaHSO3, water and brine, dried (MgSO4) and solvent evaporated to a syrup which was chromatographed on silica (9×10 cm) packed in hexane and eluted with a mixture of hexane and EtOAc (85:15, gradient elution) to give the title compound as a foam (4.35 g, 76.2%).
1 H NMR (200 MHz, CDCl3 7.24) δ: 0.05 (s, 12H, Si(CH3)2), 0.857, 0.86 (2s, 18H, SiC(CH3)2), 1.26 (d, 3H, CH3), 1.62-1.78; 1.98.2.12 (m, 2H, CH2), 3.05 (dd, 1H, H-6, J6,1' =6.93 Hz), 3.45-3.6 (m, 1H, H-4), 3.53-3.8 (centers m, 2H, CH2 O), 4.03 (dd, 1H, H-5, J5,6 =2.38 Hz, J4,5 =9.21 Hz), 4.1 (tight AB, 2H, SCH2), 4.18 (m, 1H, H-1'), 4.59-4.82 (m, 2H, OCH2, allyl), 5.17-5.46 (m, 2H, ═CH2, allyl), 5.83-6.02 (m, 1H, CH═, allyl), 7.16-7.34 (m, 5H, phenyl).
B. Allyl (4R,5S,6S)-6-[(1'R)-1'-(tert-butyldimethylsilyloxyethyl)]-3-benzylthio-4-( 2"-hydroxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate ##STR483##
A cold (0°C) solution of allyl (4R,5S,6S)-6-[(1'R)-1'-(tert-butyldimethylsilyloxyethyl)]-3-benzylthio-4-[ 2"-tert-butyldimethylsilyloxyethyl]-7-oxo-1-azabicyclo-[3.2.0]hept-2-ene-2- carboxylate (4.35 g, 6.88 mmol) in drytetrahydrofuran (65 mL) was treated, under Argon, with acetic acid (2.36 mL, 41.26 mmol) followed by a 1M solution of tetrabutylammonium fluoride in tetrahydrofuran (20.63 mL, 20.63 mmol). The mixture was stirred at 0°C for 5 h and left at -20°C for 18 h after which it was neutralized at 0°C with a 1M NaHCO3 solution (42 mL, 42 mmol). The mixture was extracted with EtOAc (3×75 mL) and the combined organic phase was washed successively with cold 1M NaHCO3, water and brine, dried (MgSO4) and solvent evaporated to give a foam which was chromatographed on silica (7.5×8 cm) packed in CH2 Cl2 and eluted with a mixture of CH2 Cl2 and CH3 CN (8:2, gradient elution) to give the title compound as a foam (2.49 g, 69.9%).
1 H NMR (200 MHz, CDCl3, 7.24) δ: 0.04, 0.05 (2 s, 6H, Si(CH3)2), 0.86 (s, 9H, SiC(CH3)2), 1.26 (d, 3H, CH3), 1.63-1.8; 1.98-2.14 (m, 2H, CH2), 3.12 (dd, 1H, H-6, J6,1' =7.46 Hz), 3.45 (m, 1H, H-4, J=2.19, 9.45, 11.5 Hz), 3.63, 3.82 (centers of m, 2H, CH2 O), 4.01 (dd, 1H, H-5, J5,6 =2.59 Hz, J4,5 =9.45 Hz), 4.03-4.13 (AB, 2H, SCH2, J=13.26 Hz), 4.155 (m, 1H, H-1'), 4.59-4.84 (m, 2H, OCH2, allyl), 5.18-5.46 (m, 2H, ═CH2, allyl), 5.83-6.03 (m, 1H, CH═, allyl), 7.19-7.38 (m, 5H, phenyl).
C. Allyl (4R,5S,6S)-6-[(1'R)-1'-(tert-butyldimethylsilyloxyethyl)]-3-benzylthio-4-[ 2"-(N-benzyl-N-methyl)aminoethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-car boxylate ##STR484##
A solution of allyl (4R,5S,6S)-6-[(1'R)-1'-(tert-butyldimethylsilyloxyethyl)]-3-benzylthio-4-[ 2"-hydroxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate (0.5 g, 0.97 mmol) in dry CH2 Cl2 (15 mL) was cooled to -78°C under Argon and treated with diisopropylethylamine (0.185 mL, 1.06 mmol) followed by (CF3 SO2)2 O (0.18 mL, 1.06 mmol). After 1 h at -78°C, N-benzyl-N-methylamine (0.75 mL, 5.8 mmol) was added and the mixture was stirred at -78°C for 1 h and at 0°C for 5 h and left at 5°C for 16 h. The reaction mixture was diluted with EtOAc (200 mL) and washed with cold water and brine, dried (MgSO4) and solvent evaporated to a syrup which was chromatographed on silica (4.5×13 cm) packed in CH2 Cl2. The title compound was eluted with a mixture of CH2 Cl2 and EtOAc (7:3, gradient elution) to give a syrup (0.4 g, 66.7%).
1 H NMR (200 MHz, CDCl3 7.24) δ: 0.036, 0.045 (2 s, 6H, Si(CH3)2), 0.86 (s, 9H, SiC(CH3)3), 1.07 (d, 3H, CH3, J=6.16 Hz), 2.26 (S, 3H, NCH3), 3.18 (m, 1H, H-4, J=1.94, 9.27, 11.37 Hz), 3.44-3.56 (AB, 2H, NCH2, JAB =13.15 Hz), 3.94 (dd, 1H, H-5, J5,6 =2.47 Hz J4,5 =9.32 Hz), 4.0-4.1 (AB, 2H, SCH2, JAB =13.21 Hz), 4.14 (m, 1H, H-1'), 4.7-4.8 (m, 2H, OCH2, allyl), 5.19-5.48 (m 2H, ═CH2, allyl), 5.85-6.04 (m, 1H, CH═, allyl), 7.19-7.78 (m, 10H, phenyl).
D. Allyl (4R,5S,6S)-6-[(1'R)-1'-hydroxyethyl]-3-benzylthio-4-[2"-(N-benzyl-N-methyl )aminoethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate ##STR485##
A cold (0°C) solution of allyl (4R,5S,6S)-6-[(1'R)-1'-tert-butyldimethylsilyloxyethyl]-3-benzylthio-4-[2" -(N-benzyl-N-methyl)-aminoethyl]-7-oxo-1-azabi-cyclo[3-2.0]-hept-2-ene-2-ca rboxylate (0.4 g, 0.65 mmol) in dry tetrahydrofuran (8 mL) was treated, under Argon with HOAc (0.22 mL, 3.89 mmol) followed by a 1M solution of tetrabutylammonium fluoride in tetrahydrofuran (1.95 mL, 1.95 mmol). The mixture was stirred between 0° and 5°C for 168 h and then neutralized at 0°C with a 1M NaHCO3 solution (3.9 mL., 3.9 mmol). The mixture was extracted with EtOAc (3×80 mL) and the combined organic extract was washed successively with a cold 1M NaHCO3, water and brine, dried (MgSO4) and solvent evaporated to give a gum which was chromatographed on silica (3.2×12 cm) packed in CH2 Cl2. The column was eluted first with a mixture of CH2 Cl2 and EtOAc (100:0→0:100, gradient elution) and finally the title compound was eluted with a mixture of EtOAc and acetone (8:2, gradient elution) to give a foam (0.093 g, 28.3%).
1 H NMR (200 MHz, CDCl3 7.24) δ: 1.13 (d, 3H, CH3, J=6.28 Hz), 1.94-2.39 (m, 2H, CH2 N), 2.34 (s, 3H, NCH3), 2.9 (dd, 1H, H-6, J6,1 ' =7.77 Hz), 3.23 (m, 1H, H-4), 3.44, 3.52 (AB, 2H, NCH2, JAB =13.1 Hz), 3.77 (dd, 1H, H-5, J4,5 =9.56 Hz, J5,6 =2.57 Hz), 3.88 (m, 1H, H-1'), 3.98-4.09 (AB, 2H, SCH2, JAB=13.59 Hz), 4.59-4.86 (m, 2H, OCH2, allyl), 5.19-5.45 (m, 2H, =CH2, allyl), 5.84-6.03 (m, 1H, CH═, allyl), 7.24-7.32 (m, 10H, phenyl).
E. (4R,5S,6S)-6-[(1'R)-1'-Hydroxyethyl]-3-benzylthio-4-[2"-(N-benzyl-N-methyl )aminoethyl]-7-oxo-1-azabicyclo-[3.2.0]hept-2-ene-2-carboxylic acid ##STR486##
To a cold (0°C) solution of allyl (4R,5S,6S)-6-[(1'R)-1'-hydroxyethyl]-3-benzylthio-4-[2"-(N-benzyl-N-methyl )-a-minoethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate (0.093 g, 0.18 mmol) in CH2 Cl2 (5 mL), under Argon, was added Pd[Ph3 P]4 (0.026 g, 0.023 mmol) followed by a 0.5M solution of 2-ethyl hexanoate in EtOAc (0.37 mL, 0.18 mmol). The mixture was stirred at 0°C for 50 min, diluted with diethyl ether (50 mL) and extracted with 0.1M pH 7.0 phosphate buffer (3×10 mL). The combined aqueous extract was passed through a column of μBondapak C18 reverse phase silica (3.2×7 cm). The title compound was eluted with a mixture of water and CH3 CN (7:3, gradient elution) and was obtained as a fluffy solid (0.067 g, 78.2%).
Purity: 99.9% by HPLC, UV detection at λmax : 304 nm, on μBondapak C18 (4 mm×30 cm), pH 6.8 phosphate buffer, flow rate 1 mL/min, retention time: 7.22 min.
UV λmax : 304 nm.
IR (Nujol) νmax : 1750 cm-1 (C═O, β-lactam).
1 H NMR (200 MHz, D2 O) δ: 1.12 (d, 3H, CH3, J=6.35 Hz), 1.38, 1.94 (centres m, 2H, CH2), 2.38 (s, 3H, NCH3), 2.47 (centre m, 2H, CH2 CN), 3.04 (m, overlap, 1H, H-6), 3.05 (m, overlap, 1H, H-4), 3.72 (tight AB, 2H, NCH2), 4.05 (dd, 1H, H-5), 3.96, 4.09 (AB, 2H, SCH2, JAB =13.8 Hz), 4.11 (m, 1H, H-1'), 7.35-7.54 (m, 10H, phenyl).
(4R,5S,6S)-3-[(2--Cyanoethyl)thio]-6-[(1'R)-1'-hydroxyethyl]-4-(3-N-methyla minopropyl)-7-oxo-1-azabicyclo-[3.2.0]hept-2-ene-2-carboxylic acid ##STR487## A. 5-N-Allyloxycarbonyl-N-methylaminovaleric acid ##STR488##
A mixture of 1-methyl-2-piperidone (13.0 g, 0.115 mmol) and 100 mL of 6N hydrochloric acid was heated under reflux for 8 h. The solvent was evaporated to dryness and the residual amino acid as described by M. Maeda, et. al., Chem. Pharm. Bull. 32, 4157 (1984) was diluted with cold water (0°-5°C, 100 mL). The pH was adjusted to 8.5 with solid sodium carbonate and allyl chloroformate (12.2 mL, 0.115 mmol) was added dropwise while maintaining the pH to 8-8.5. After 30 min at 0°C and another 30 min at 22°C, the reaction mixture was washed with diethyl ether and the aqueous phase was adjusted to pH 3 with concentrated hydrochloric acid. The aqueous solution was extracted with diethyl ether (3×200 mL) and the combined organic extract was washed with brine and dried (MgSO4). Evaporation of the solvent gave 22.9 g (93%) of the title acid as an oil.
IR (NaCl, film) νmax : 1740, 1710 and 1680 cm-1 (sh);
1 H NMR (200 MHz, CDCl3) δ: 1.5-1.7 (m, 4H, CH2 -3 and (4), 2.35-2.45 (m, 2H, CH2 -2), 2.90 (s, 3H, NCH3), 3.25-3.35 (m, 2H, CH2 N), 4.55-4.6 (m, 2H, CH2 of allyl), 5.15-5.35 and 5.85-6.05 ppm (2m, 2H and 1H, CH of allyl).
B. 5-N-Allyloxycarbonyl-N-methylaminovaleryl chloride ##STR489##
A solution of 5-N-allyloxycarbonyl-N-methylaminovaleric acid (35.26 g, 0.164 mol) in dry dichloromethane (175 mL) was treated dropwise at 22°C with oxalyl chloride (15.7 mL, 0.180 mol). After 10 min, 4 drops of N,N-dimethylformamide were added and the reaction mixture was stirred for 2.0 h, while the evacuation of gas slowly ceased. The solvent and excess reagent were evaporated under reduced pressure and the residual acid chloride was used as such for the next step:
IR (NaCl, film) νmax : 1800 (C═O of acid chloride), 1740 (sh), 1705 and 1670 cm-1 (sh);
1 H NMR (200 MHz, CDCl3) δ: 1.5-1.8 (m, 4H, CH2 -3 and 4), 2.90 (s, 3H, NCH3), 2.9-3.0 (m, 2H, CH2 -2), 3.29 (t, 2H, CH2 N), 4.55-4.6 (m, 2H, CH2 of allyl), 5.15-5.35 and 5.8-6.0 ppm (2m, 2H and 1H, CH of allyl).
C. 2-Picolyl-5-(N-allyloxycarbonyl-N-methylamino]thiolvalerate ##STR490##
A solution of 2-picolyl mercaptan (20.5 g, 0.164 mol) in dry dichloromethane (350 mL) was treated at 0°C and under nitrogen with pyridine (16.0 mL, 0.197 mol) followed by a solution of 5-N-allyloxycarbonyl-N-methylaminovaleryl chloride (46.0 g, 0.164 mol) in dichloromethane (75 mL) added dropwise over 10 min. After 1.5 h at 0°-5°C, the reaction mixture was washed with saturated sodium bicarbonate, brine and dried (MgSO4). Evaporation of the solvent under reduced pressure gave an oil which was filtered through a silica gel pad (7.5×12 cm) using a mixture of toluene and ethyl acetate (1:1) as eluent. Evaporation of the UV active fractions gave 48.4 g (92%) of the title material as a clear oil:
IR (NaCl, film) νmax : 1700 and 1690 (sh) cm-1 ;
1 H NMR (200 MHz, D2 O) δ: 1.5-1.7 (m, 4H, CH2 -3 and 4), 2.61 (t, J=7.0 Hz, 2H, CH2 -2), 2.87 (s, 3H, NCH3), 3.26 (t, J=6.6 Hz, 2H, CH2 -5), 4.24 (s, 2H, CH2 Pyr), 4.55-4.6 (m, 2H, CH2 of allyl), 5.15-5.3 and 5.9-6.05 (2 m, 2H and 1H, H of allyl), 7.1-7.2 (m, 1H, H-5 of pyridine), 7.33 (d, J=7.8 Hz, 1H, H-3 of pyridine), 7.62 (m, 1H, H-4 of pyridine) and 8.5-8.55 ppm (m, 1H, H-6 of pyridine).
D. tert-Butyldimethylsilylenol ether of 2-picolyl-5-(N-allyloxycarbonyl-N-methylamino)thiolvalerate ##STR491##
A solution of 2-picolyl 5-(N-allyloxycarbonyl-N-methylamino)thiolvalerate (51.3 g, 0,159 mol) in dry dichloromethane (225 mL) was cooled to -10°C and treated with triethylamine (44 mL, 0.315 mol) followed by tertbutyldimethylsilyl trifluoromethanesulfonate (56 mL, 0.243 mol) dropwise over 40 min. After warming to 22°C, the solution was stirred for 3 h. The reaction mixture was then diluted with hexane (1 L) and washed with cold water (3×300 mL). The combined aqueous washings were extracted with hexanes (300 mL) and the combined organic extracts were washed with brine and dried (MgSO4). After treating with activated carbon, the solvent was evaporated under vacuum to give the crude silyl enol ether as a dark oil which was used as such for the next step. By 1 H NMR, the product was a 1:1 mixture of E and Z isomers.
IR (NaCl film) νmax : 1705 cm-1 (C═O of carbamate);
1 H NMR (200 MHz, CDCl3) δ: 2.83 and 2.85 (2s, NC H3), 3.96 and 4.03 (2s, CH2 Pyr), 4.85 (t, J=5 Hz, C H═CSO) and 5.0 ppm (broad t, C H═CSO).
E. (3S,4S)-3-[(1'R)-1'-tert-Butyldimethylsilyloxyethyl]-4-[(1R)-1-(2-pyridyl) methylthiocarbonyl-4-(N-allyloxycarbonyl-N-methylamino)butyl]azetidin-2-one ##STR492##
To a suspension of freshly fused zinc chloride (35.0 g, 0.256 mol) in dry dichloromethane (400 mL) was added at 22°C solid 4R-acetoxy-3S-[(1'R)-1'-tert-butyldimethylsilyl-oxyethyl]azetidin-2-one (36.5 g, 0.127 mol) followed by a solution of the crude silyl enol ether (0.159 mol) in dry dichloromethane (50 mL). The reaction mixture was then stirred at 22°C for 18 h. The mixture was then washed with water, saturated ammonium chloride, saturated sodium bicarbonate, brine and dried (MgSO4). Evaporation of the solvent under reduced pressure gave an oil which was chromatographed on silica gel (15×12 cm). Elution with a gradient of ethyl acetate (50-100%) in toluene gave 34.16 g (49%) of the title material as an oil. By 1 H NMR this product was a 84:16 mixture of β and α isomers.
IR (NaCl, film) νmax : 1765 (C═O of β-lactam), 1705 (sh) and 1685 cm-1 (C═O of carbamate and thioester);
1 H NMR (200 MHz, CDCl3, major isomer, β) δ: 0.04 (s, 6H, SiCH3), 0.85 (s, 9H, Si-t-Bu), 0.97 (d, J=6.33 Hz, 3H, CH3 CHO), 1.3-1.8 (m, 4H, CH2 -2 and 3 of butyl), 2.83 (s, 3H, NCH3), 2.83 (m overlapping with NCH3, 1H, H-1 of butyl), 3.03 (broad t, 1H, H-3), 3.1-3.4 (m, 2H, CH2 N), 3.79 (dd, JH4,H3 =1.96 Hz, JH4,H1 =7.16 Hz, 1H, H-4), 4.1-4.25 (m, 1H, CH3 CHO), 4.26 (s, 2H, CH2 Pyr), 4.55-4.6 (m, 2H, CH2 of allyl), 5.15-5.35 (m, 2H, CH of allyl), 5.85-6.1 (m, 2H, NH and CH of allyl), 7.15-7.20 (m, 1H, H-5 of pyridine), 7.32 (d, J=7.78 Hz, 1H, H-3 of pyridine), 7.55-7.65 (m, 1H, H-4 of pyridine) and 8.5-8.55 ppm (m, 1H, H-6 of pyridine).
F. Imidazolide of (3S,4S)-3-[(1'R)-1'-tert-butyldimethylsilyloxyethyl]-4-[(1R)-1-carboxy-4-( N-allyloxycarbonyl-N-methylamino)butyl]azetidin-2-one ##STR493##
A solution of (3S,4S)-3-[(1'R)-1'-tert-butyldimethylsilyloxyethyl]-4-[(1R)-1-carboxy-4-( N-allyloxycarbonyl-N-methylamino)butyl]azetidin-2-one (13.56 g, 31.6 mmol) in dry acetonitrile (300 mL) was treated at 22°C and under nitrogen with 1,1-carbonyldiimidazole (5.64 g, 34.8 mmol). After 3 h, the solvent was evaporated under reduced pressure and the crude imidazolide was used as such for the next step.
IR (NaCl, film) νmax : 1760, 1740 and 1700 cm1.
G. (3S,4S)-3-[(1'R)-1'-tert-Butyldimethylsilyloxyethyl]-4-[(1R)-1-carboxy-4-( N-allyloxycarbonyl-N-methyl-amino)butyl]azetidin-2-one ##STR494##
A solution of (3S,4S)-3-[(1'R)-1'-tert-butyldimethylsilyloxyethyl]-4-[(1R)-1-(2-pyridyl) methylthiocarbonyl-4-(N-allyloxycarbonyl-N-methylamino)butyl]azetidin-2-one (32.16 g, 58.5 mmol) in dry tetrahydrofuran (250 mL) was treated dropwise at 0°-5°C with 30% hydrogen peroxide (20 mL, 0.23 mol) (addition time 5 min) followed by 64 mL (64.0 mmol) of 1N aqueous sodium hydroxide (addition time 20 min). The reaction mixture is then stirred at 22°C for 1 h. Then hexane (500 mL) was added and the mixture was stirred for another 10 min. The aqueous phase formed was collected and the organic phase was extracted with 100 mL of 0.1N sodium hydroxide. The combined aqueous extracts were cooled to 0°-5°C, acidified to pH 2 with concentrated hydrochloric acid and extracted with ethyl acetate (2×350 mL). The combined organic extracts were washed with 1M sodium bisulfite, brine and dried (MgSO4). Evaporation of the solvent under reduced pressure gave 13.56 g (52%) of the crude title acid as a foam. 1 H NMR indicated a δ: 2 mixture of β and α isomers.
IR (NaCl, film) νmax : 1740 (C═O of β-lactam) and 1700 (broad, C═O of carbamate and acid);
1 H NMR (200 MHz, CDCl3) δ: 0.05 and 0.06 (2s, 6H, SiCH3), 0.86 (s, 9H, Si-t-Bu), 1.15 (d, J=6.30 Hz, 3H, CH3 CHO), 1.4-1.8 (m, 4H, CH2 -2 and 3 of propyl), 2.6-2.7 (m, 1H, H-1 of butyl), 2.89 (s, 3H, NCH3), 3.12 (broad t, 1H, H-3), 3.2-3.5 (m, 2H, CH2 N), 3.86 (dd, JH4,H3 =1.84 Hz, JH4,H1 =6.38 Hz, 1H, H-4), 4.19 (dq, JH,CH3 =6.30, JH,H3 =3.8 Hz, 1H, CH3 CHO), 4.55-4.6 (m, 2H, CH2 of allyl), 5.15-5.35 and 5.8-6.05 (2m, 2H and 1H, CH of allyl) and 6.53 ppm (broad s, 1H, NH).
H. (3S,4R)-3-[(1'R)-1'-tert-Butyldimethylsilyloxyethyl]-4-{(1R)-[(3-N-allylox ycarbonyl-N-methylamino)propyl]-3-allyloxycarbonyl-2-oxopropyl}azetidin-2-o ne ##STR495##
A solution of the crude imidazole (31.6 mmol) in dry acetonitrile (50 mL) was added to a mixture of magnesium monoallyl malonate (16.0 g, 51.5 mmol) in dry benzene (300 mL) and the resulting mixture was maintained at 65°C for 16 h. The cooled reaction mixture was then diluted with ethyl acetate (500 mL) washed with cold 1N aqueous hydrochloric acid, saturated sodium bicarbonate and brine. After drying (MgSO4), the organic phase was evaporated under reduced pressure and the residual oil was used as such for the next step. Chromatography of a small aliquot on silica gel (elution toluene-ethyl acetate 9:1 to 1:1) gave the title compound as an oil. 1 H NMR indicated a 1:1 mixture of keto and enol form.
IR (NaCl, film) νmax : 1760 (C═O of β-lactam) and 1705 cm-1 ;
1 H NMR (200 MHz, CDCl3) δ: 0.05 and 0.06 (28, SiCH3), 0.86 (s, Si-t-Bu), 1.09 and 1.16 (2d, J=6.31 Hz, J=6.29 Hz, CH3 CHO), 1.3-1.8 (m, CH2 -1 and 2 of butyl), 2.1 (m, H-1 of oxopropyl, keto form), 2.88 (s, NCH3), 2.8-3.1 (m, H-3), 3.2-3.3 (m, CH2 N), 3.55 (s, CH2 -3 of oxopropyl keto form), 3.82 (2 dd overlapping, H-4), 4.1 (m, 1H, CH3 CHO), 4.57 and 4.63 (2m, CH2 of allyl), 5.08 (s, CH-3 of oxopropyl, enol form), 5.15-5.4 (m, CH of allyl) and 5.8-6.1 ppm (m, CH of allyl and NH).
I. (3S,4R)-3-[(1'R)-1'-tert-Butyldimethylsilyloxyethyl]-4-{(1R]-1-[{3-N-allyl oxycarbonyl-N-methylamino)propyl]-3-allyloxycarbonyl-3-diazo-2-oxopropyl}-a zetidin-2-one ##STR496##
A solution of (3S,4R)-3-[(1'R)-1'-tert-butyldimethylsilyloxyethyl]-4-{(1R)-1-[(3-N-allyl oxycarbonyl-N-methylamino)propyl]-3-allyloxycarbonyl-2-oxopropyl}-azetidin- 2-one (crude from the previous step, 31.6 mmol) in acetonitrile (100 mL) was cooled to 0°-5°C and treated with a solution of p-toluenesulfonyl azide (6.45 g, 32.7 mmol) in acetonitrile (35 mL.). Then N,N-diisopropylethylamine (4.6 mL, 33.0 mmol) was added dropwise over 5 min and the resulting mixture was stirred for 45 min at 22°C The solvent was then evaporated under reduced pressure and the residue was triturated with a mixture of diethyl ether and hexanes (1:1, 100 mL). The crystalline p-toluenesulfonamide was collected by filtration and washed with a mixture of diethyl ether and hexanes (1:1). The filtrate and the washing were evaporated under reduced pressure to give the crude diazoazetidinone which was used as such for the next step. Purification of a small aliquot on silica gel (elution toluene ethyl acetate 1:1) gave the title compound as an oil.
IR (NaCl, film) νmax : 2140 (N2), 1760 (C═O of β-lactam), 1710 and 1650 cm ;
1 H NMR (200 MHz, CDCl3) δ: 0.05 and 0.06 (2s, 6H, SiCH3), 0.86 (s, 9H, Si-t-Bu), 1.15 (d, J=6.35 Hz, 3H, CH3 CHO), 1.3-1.9 (m, 4H, CH2 -1 and 2 of propyl), 2.87 (s, 3H, NCH3), 3.03 (m, 1H, H-3), 3.23 (broad t, J=6.7 Hz, CH2 N), 3.84 (dd, JH4,H3 =2.09 Hz, JH4,H1 =5.51 Hz, 1H, H-4), 4.0-4.15 (m, 1H, H-1 of oxopropyl), 4.15-4.25 (m, 1H, CH3 CHO), 4.5-4.6 and 4.7-4.8 (2m, 2×2H, CH2 of allyl), 5.1-5.3 (m, 4H, CH of allyl) and 5.8-6.1 ppm (m, 3H, CH of allyl and NH).
J. (3S,4R)-4-{(1R)-1-[(3-N-Allyloxycarbonyl-N-methylamino)propyl]-3-allyloxyc arbonyl-3-diazo-2-oxopropyl}-3-[(1'R)-1'-hydroxyethyl]azetidin-2-one ##STR497##
A solution of (3S,4R)-3-[(1'R)-1'-tert-butyldimethylsilyloxyethyl]-4-{(1R)-1-[(3-N-allyl oxycarbonyl-N-methylamino)propyl]-3-allyloxycarbonyl-3-diazo-2-oxopropyl}-a zetidin-2-one (31.6 mmol, crude from the previous step) in ethanol (175 mL) was cooled to 0°-5°C and treated with 1N aqueous hydrochloric acid (100 mL). After 18 h at 5°C, the pH was adjusted to 6 with solid sodium bicarbonate and the ethanol was evaporated under reduced pressure. The residue was diluted with ethyl acetate (300 mL) and the organic phase was washed with 0.2M pH 7.0 phosphate buffer and brand brine. After drying (MgSO4), the solvent was evaporated under reduced pressure and the residue was chromatographed on silica gel (9×11 cm). Elution with a mixture of toluene and ethyl acetate (1:1) gave 5.92 g (43%, yield for 5 steps from the acid) of the title compound as an oil.
IR (NaCl, film) νmax : 3450 and 3280 (broad OH and NH), 2140 (N2), 1755 (C═O of β-lactam), 1700 (broad) and 1645 cm-1 ;
1 H NMR (200 MHz, CDCl3) δ: 1.29 (d, J=6.33 Hz, 1H, CH3 HO), 1.4-1.8 (m, 4H, CH2 -1 and 2 of propyl), 2.88 (s, 3H, NCH3), 2.9 (broad, 1H, H-3), 3.1-3.4 (m, 2H, CH2 N), 3.80 (dd, JH4,H3 =1.98 Hz, JH4,H1 =6.95 Hz, 1H, H-4), 3.9-4.0 (m, 1H, H-1 of oxopropyl), 4.1 (m, 1H, CH3 CHO), 4.55-4.6 and 4.7-4.75 (2m, 2×2H, CH2 of allyl), 5.2-5.45 and 5.9-6.1 (2m, 4H and 2H, CH of allyl) and 6.6 ppm (broad s, NH).
K. Allyl (2R,4R,5R,6S)-4-[(3"-N-allyloxycarbonyl-N-methylamino]propyl]-6-[(1'R)-1'- hydroxyethyl]-3,7-dioxo-1-azabicyclo[3.2.0]heptane-2-carboxylate ##STR498##
A solution of (3S,4R)-4-{(1R)-1-[(3-N-allyloxycarbonyl-N-methylamino)propyl]-3-allyloxyc arbonyl-3-diazo-2-oxopropyl}-3-[(1'R)-1'-hydroxyethyl]azetidin-2-one(2.00 g, 4.58 mmol) in dry benzene (80 mL) was heated under reflux in presence of rhodium octanoate dimer (0.050 g) for 30 min. The solvent was evaporated under reduced pressure and the title bicyclic product was used as such for the next step.
IR (NaCl, film) νmax : 3450 (OH), 1762 (C═O of β-lactam), 1645 (sh) and 1690 cm-1 ;
1 H NMR (200 MHz, CDCl3) δ: 1.43 (broad d, J=6.1 Hz, 3H, CH3 CHO), 1.5-2.0 (m, 4H, CH2 -1 and 2 of propyl), 2.9 (m, 1H, H-4 of propyl), 2.92 (s, 3H, NCH3), 3.1-3.4 (m, 3H, H-6 and CH2 N), 4.1-4.3 (m, 1H, CH3 CHO), 4.3 broad dd, 1H, H-5), 4.56 and 4.66 (2m, 2×2H, CH2 of allyl), 5.15-5.4 and 5.8-6.15 ppm (2m, 4H and 2H, CH of allyl).
L. Allyl (4R,5S,6S)-4-[(3"-N-allyloxycarbonyl-N-methylamino)propyl]-3-[(2-cyanoethy l)thio]-6-[(1'R)-1'-hydroxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-car boxylate ##STR499##
A solution of the crude bicyclic ketone prepared in Step K (4.58 mmol) in dry acetonitrile (40 mL) was treated at 0°-5°C and under nitrogen with diphenyl chlorophosphate (1.04 mL, 5.02 mmol) and N,N-diisopropylethylamine (0.88 mL, 5.06 mmol) added simultaneously over 2 min. A small crystal of 4-N,N-dimethylaminopyridine was added and the mixture was stirred for 45 min. Then more N,N-diisopropylethylamine (0.80 mL, 4.60 mmol) followed by a solution of β-mercaptopropionitrile (0.40 g, 4.60 mmol) in acetonitrile (2 mL) were added and the resulting mixture was stirred for 1 h. The reaction mixture was then diluted with ethyl acetate (300 mL) washed with cold water, saturated sodium bicarbonate, brine and dried (MgSO4). Evaporation of the solvent under reduced pressure gave an oil which was chromatographed on silica gel (5×10 cm). Elution with a gradient of ethyl acetate in toluene (1:1 to EtOAc) gave 1.45 g (67%) of the title compound as an oil.
IR (NaCl, film) νmax : 3450 (OH), 2250 (CN), 1775 (C═O of β-lactam) and 1700 cm-1 (C═O of ester and carbamate);
1 H NMR (200 MHz, CDCl3) δ: 1.44 (broad d, J=6.0 Hz, 3H, CH3 CHO), 1.5-2.0 (m, 4H, CH2 -1 and 2 of propyl), 2.67 (broad t, 2H, SCH2 CH2 CN), 2.94 (s, 3H, NCH3), 2.9-3.5 (m, 4H, H-6, H-4 and CH2 N), 4.06 (m, 1H, CH3 CHO), 4.28 (dd, JH5,H6 =2.78 Hz, JH5,H4 =9.79 Hz, 1H, H-5), 4.57 and 4.76 (2m, 2×2H, CH2 of allyl), 5.2-5.5 and 5.8-6.1 ppm (2m, 4H and 2H, CH of allyl).
M. (4R,5S,6S)-3-[(2-Cyanoethyl)thio]-6-[(1'R)-1'-hydroxyethyl]-4-(3"-N-methyl aminopropyl)-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ##STR500##
A solution of allyl (4R,5S,6S)-4-[(3"-N-allyloxycarbonyl-N-methylamino)propyl]-3-[(2-cyanoethy l)thio]-6-[(1'R)-1'-hydroxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-car boxylate (0.760 g, 1.59 mmol) in dry dichloromethane (25 mL) was treated at 22°C and under nitrogen with N-methylaniline (1.0 mL, 9.23 mmol) followed by tetrakis(triphenylphosphine)palladium[O] (0.060 g). After 3 h, the reaction mixture was extracted with water (2×25 mL) and 0.05M pH 6.0 phosphate buffer (35 mL). The combined aqueous extract was chromatographed on reversed phase silica gel (3×13 cm) using a gradient of acetonitrile (0-10%) in water as eluent. Lyophilization of the first fractions gave 0.156 g (27%) of the title compound as a white amorphous solid: [α]22D +57.9° (c 1.0, water).
Purity by HPLC: 99.7% on μBondapak C18, 3.9 mm×30 cm, elution 5% CH3 CN--H2 O pH 7.4 phosphate buffer, flow rate 0.7 mLin, UV detector 302 nm, retention time 6.37 min;
UV (water pH 7.4 phosphate buffer) λmax : 300 nm (9,050);
IR (KBr) νmax : 2250 (CN), 1755 (C═O of β-lactam) and 1590 cm-1 (C═O of carboxylate);
1 H NMR (200 MHz, D2 O) δ: 1.33 (d, J=6.35 Hz, 3H, CH3 CHO), 1.5-2.0 (m, 4H, CH2 -1 and 2 of propyl), 2.72 (s, 3H, CH3 N), 2.75-2.9 (m, 2H, SCH2 CH2 CN), 2.9-3.25 (m, 2H, CH2 N), 3.40 (dd, JH6,H5 =2.61 Hz, JH6,H1 =6.53 Hz, 1H, H-6), 3.42 (m overlapping with H-6, 1H, H-4) and 4.2-4.35 ppm (m, 2H, H-5 and CH3 CHO overlapping).
When the general procedures of the foregoing text and examples are repeated with the appropriate intermediate and mercaptan compound, there is thereby produced a compound or salt thereof having the formula ##STR501## wherein B--R3 is ##STR502##
When the general procedures of the foregoing text and examples are repeated with the appropriate intermediate and mercaptan compound, there is thereby produced a compound or salt thereof having the formula ##STR503## wherein B--R3 is ##STR504##
(4R,5S,6S)-3-[(2-Aminoethyl)thio]-6-[(1'R)-1'-hydroxyethyl]-4-[(2"S)-(2"-py rrolidinyl)methyl]-7-oxo-1-azabicyclo[2.0]-hept-2-ene-2-carboxylic acid acetic acid salt ##STR505## A. (S)-1-Allyloxycarbonyl-2-(hydroxymethyl)pyrrolidine ##STR506##
A solution of (S)-2-(hydroxymethyl)pyrrolidine (5.05 g, 0.05 mol) in cold 1.0N sodium hydroxide solution (1 eq, 50 mL) was treated dropwise over 45 min at 0°-5°C with a solution of allyl chloroformate (1.2 eq, 0.06 mol, 6.6 mL) in acetone (60 mL). After 15 min, the acetone was evaporated and the residue was extracted with ethyl acetate (2×75 mL). The combined organic phases were washed with water, saturated sodium bicarbonate, brine and dried (MgSO4). Evaporation of the solvent under reduced pressure and distillation with a Kugelrohr apparatus (0.1 mm Hg, 80°-100°C) gave 8.5 g (92%) of the title carbamate as a pinkish oil:
IR (NaCl) νmax : 3425 (OH), 1690 cm-1 (C═O of carbamate);
1 H NMR (200 MHz, CDCl3) δ:1.5-2.1 (m, 4H, CH2 -3 and CH2 -4), 3.3-3.6 (2×m, 2H, CH2 --OH), 3.6-3.7 (m, 2H, N--CH2), 3.9-4.1 (m, 1H, CH-2), 4.5-4.6 (m, 2H, CH2 of allyl), 5.15-5.35 and 5.8-6.0 ppm (2m, 2H and 1H, CH of allyl).
B. (S)-1-Allyloxycarbonyl-2-formyl-pyrrolidine ##STR507##
A solution of oxalyl chloride (4 mL, 44 mmol) in dry dichloromethane (96 mL) was cooled to -60°C under argon and treated dropwise (ca 5 min) with a dry solution of dimethylsulfoxide (6.8 mL, 88 mmol) in dichloromethane (16 mL). The reaction mixture was stirred for 2 min and a solution of (S)-1-allyloxocarbonyl-2-(hydroxymethyl)pyrrolidine (7.4 g, 40 mmol) in dry dichloromethane (40 mL) was added dropwise within 6 min, then stirring was continued for an additional 15 min. Triethylamine (28 mL, 200 mmol) was added and the reaction mixture was stirred for 5 min and then allowed to warm to room temperature (ca 60 min). Cold water (200 mL) was added and the reaction mixture was extracted with diethyl ether (2×200 mL). The organic layers were combined, washed with dilute 1N HCl (200 mL), water, saturated sodium bicarbonate, brine and dried (MgSO4). Evaporation of the solvent under reduced pressure gave 6.2 g (85%) of the title aldehyde as an oil:
IR (NaCl, film) νmax: 1735 (C═O of formyl) and 1700 cm-1 (C═O of carbamate);
1 H NMR (200 MHz, CDCl3) δ: 1.8-2.3 (m, 4H, CH2 -3 and CH2 -4), 3.4-3.7 (m, 2H, C H2 --N), 4.1-4.4 (m, 1H, H-2), 4.5-4.7 (m, 2H, CH2 of allyl), 5.1-5.4 and 5.8-6.1 (2m, 2H and 1H, CH of allyl), 9.51 and 9.57 ppm (2d, 1H, C HO, J=2.4 Hz and J=1.65 Hz).
C. Ethyl 3-[(2'S)-2'-(1'-allyloxycarbonylpyrrolidinyl)]acrylate ##STR508##
A solution of (S)-1-allyloxycarbonyl-2-formylpyrrolidine (6.2 g, 33.84 mmol) in dry methanol (30 mL) was cooled to 0°-5°C under argon then treated portionwise with (carbethoxymethylene) triphenylphosphorane (1.2 eq, 14.2 g, 40.6 mmol). The reaction mixture was stirred for 2 h at 0°C and 2 h at 25°C, then the methanol was evaporated. The residue was diluted with dry diethyl ether (100 mL), the solid was filtered, washed with diethyl ether and the filtrate was concentrated to dryness. Purification of the residue by flash chromatography (silica gel 230-400 mesh, 6.5×11 cm) using gradients of toluene -AcOEt (100:0→80:20) as eluent gave 7.83 g (91.4%) of the title acrylate as an oil:
[α]D24 =38.6° (C 1.1, CHCl3);
IR (NaCl, film) νmax: 1700-1720 (broad, CO of carbamate and ester);
1 H NMR (200 MHz, CDCl3) δ: 1.27 (t, J=7.17 Hz, 3H, CH3 of ester), 1.6-2.4 (m, 4H, CH2 -3 and CH2 -4), 3.4-3.7 (m, 2H, C H2 N), 4.17 (q, J=7.06 Hz, 2H, CH2 of ester), 4.5-4.6 (m, 3H, CH2 of allyl and CH-2), 5.1-7.2 ppm (set of m, 5H, CH of allyl and CH of acrylate).
D. Methyl 3-[(2'S)-2'-(1'-allyloxycarbonylpyrrolidinyl)]propanoate ##STR509##
A mixture of ethyl 3-[(2'S)-2'-(1'-allyloxycarbonyl pyrrolidinyl)]acrylate (7.7 g, 30.4 mmol) and magnesium turnings (7.4 g, 304 mmol) in dry methanol (250 mL) was stirred under argon for 4 h. An exothermic reaction took place and the internal temperature increased until methanol was refluxed. The reaction mixture was cooled to room temperature and 1N HCl was added carefully until the solids were completely dissolved and the residue was extracted with diethyl ether, then washed with water, brine and dried (MgSO4). Evaporation of the solvent under reduced pressure gave 6.8 g (92.7%) of the title ester as a clear oil with suitable purity to be used in the next step. An aliquot was distilled with a Kugelrohr apparatus (50 μm, 100°C):
[α]D24 =-47.1° (C=0.94, CHCl3);
IR (NaCl, film) νmax : 1735 (C═O of ester) and 1700 cm-1 (C═O of carbamate);
1 H NMR (200 MHz, CDCl3) δ: 1.5-2.4 (m, 8H, CH2 -3' and CH2 -4' of pyrrolidine and -- CH2 CH2 CO2 CH3), 3.3-3.6 (m, 2H, C H2 --N), 3.66 (s, 3H, CH3 of ester), 3.9-4.0 (m, 1H, CH-2 of pyrrolidine), 4.5-4.6 (m, 2H, CH2 of allyl), 5.15-5.35 and 5.8-6.0 ppm (2m, 2H and 1H, CH of allyl).
E. 3-[(2'S)-2'-(1'-Allyloxycarbonylpyrrolidinyl)]propanoic acid ##STR510##
A solution of methyl 3-[(2'S)-2'-(1'-allyloxycarbonylpyrrolidinyl)]propanoate (6.5 g, 26.9 mmol) in methanol (27 mL) was treated dropwise with 3N sodium hydroxide solution (1.3 eq, 11.7 mL) at room temperature. After 45 min, most of the methanol was evaporated under vacuum and the residue was washed with diethyl ether (25 mL). The aqueous phase was acidified to pH 1.8 by 1N HCl solution then extracted with diethyl ether (2×25 mL). The combined organic phases were washed with brine and dried (MgSO4). Evaporation of the solvent under reduced pressure gave 5.55 g (90.8%) of the title acid as a clear oil:
[α]D24 =-36.5° (Cl, CHCl3);
IR (NaCl, film) νmax : 1650-1740 cm-1 (broad, C═O of acid and carbamate);
1 H NMR (200 MHz, CDCl3) δ: 1.6-2.1 and 2.35-2.45 (2m, 8H, CH2 -3' and CH2 -4' of pyrrolidine and --C H2 --C H2 CO2 H), 3.35-3.5 (m, 2H, CH2 --N), 3.9-4.0 (m, 1H, CH-2' of pyrrolidine), 4.55-4.6 (m, 2H, CH2 of allyl), 5.17-5.35 and 5.84-6.04 (2m, 2H and 1H, CH of allyl).
F. 3-[(2'S)-2'-(1'-Allyloxycarbonylpyrrolidinyl)]propanoyl chloride ##STR511##
A solution of 3-[(2'S)-2'-(1'-allyloxycarbonylpyrrolidinyl)]propanoic acid (5.5 g, 24.42 mmol) in dry dichloromethane (13 mL) was treated dropwise with oxalyl choride (2.4 mL, 2.7 mmol). A drop of N,N-dimethylformamide was added and the resulting mixture was stirred at 22°C for 18 h. Evaporation of the solvent under reduced pressure gave the crude acid chloride as an orange oil which was used as such in the next step:
IR (NaCl film) νmax : 1800 (C═O of acid chloride) and 1695 cm-1 (C═O of carbamate).
G. 2'-Picolyl 3-[(2"S)-2"-(1"-allyloxycarbonylpyrrolidinyl)]thiolpropanoate ##STR512##
A solution of 2-picolyl mercaptan (2.9 g, 23.2 mmol) in dry dichloromethane (25 mL) was cooled to 0°-5°C and treated under argon with pyridine (2.4 mL, 29.3 mmol) followed by a solution of crude 3-[(2"S)-2'-(1'-allyloxycarbonylpyrrolidinyl)]propanoyl chloride (max. 24.42 mmol) in dry dichloromethane (5 mL) added dropwise. After 2 h, the reaction mixture was diluted with diethyl ether (100 mL) and washed with cold water (2×50 mL), saturated sodium bicarbonate (50 mL), brine and dried (MgSO4). Evaporation of the solvent under reduced pressure gave an oil which was chromatographed on silica gel (230-400 mesh, 4×11 cm). Elution with a gradient of toluene in ethyl acetate (100:0→70:30) gave 7.36 g (94%) of the title thioester as a yellow oil:
IR (NaCl, film) νmax : 1695 cm-1 (broad, C═O);
1 H NMR (200 MHz, CDCl3) δ: 1.6-2.1 (m, 6H, CH2 -3" and CH2 -4" of pyrrolidine and CH2 -3), 2.5-2.7 (m, 2H, CH2 -2), 3.3-3.5 (m, 2H, C H2 --N), 3.8-4.0 (m, 1H, CH-2" of pyrrolidine), 4.24 (s, 2H, S-C H2), 4.5-4.6 (m, 2H, CH2 of allyl), 5.15-5.35 and 5.8-6.1 (2m, 2H and 1H, CH of allyl), 7.12-7.19 (m, 1H, H-5 of pyridine), 7.33 (d, J=7.81 Hz, 1H, H-3 of pyridine), 7.6-7.7 (m, 1H, H-4 of pyridine) and 8.52 ppm (broad d, J=4.4 Hz, H-6 of pyridine).
H. t-Butyldimethylsilylenol ether of 2'-picolyl 3-[(2"S)-2"-(1"-alloxycarbonylpyrrolidinyl)]thiolpropanoate ##STR513##
A solution of 2'-picolyl 3-[(2"S)-2"-(1"-allyloxycarbonylpyrrolidinyl)]thiolpropanoate (5.06 g, 22.27 mmol) in dry dichloromethane (30 mL) was cooled to -10°C and treated under argon with triethylamine (7.8 mL, 55.7 mmol) followed by tert-butyldimethylsilyl trifluromethanesulfonate (10.2 mL, 44.54 mmol) added dropwise over 30 min. The dark solution was then stirred at 22°C for 3 h. The reaction mixture was then diluted with hexane (100 mL) and washed with cold water (3×100 mL), brine and dried (MgSO4). Evaporation of the solvent under reduced pressure gave the crude title material as a dark oil which was used immediately in the next step:
IR (NaCl film) νmax: 1680-1700 (broad, C═O of carbamate);
1 H NMR (200 MHz, CDCl3) δ: 3.95 (broad s, SCH2) and 4.8 and 4.95 ppm (2m, CH═CSO).
I. (3S,4S)-3-[(1'R)-1'-tert-Butyldimethylsilyloxyethyl]-4-[(1R)-1-(2-pyridyl) methylthiocarbonyl-2-(N-allyloxycarbonyl-(2"S)-2"-pyrrolidinyl)ethyl]azetid in-2-one. ##STR514##
To a suspension of freshly fused zinc chloride (2.44 g, 17.9 mmol) in dry dichloromethane (45 mL) was added at 5°C and under argon solid 4R-acetoxy-3S-[(1'R)-1'-tert-butyldimethylsilyloxyethyl]azetidin-2-one (14.9 mmol, 4.3 g) followed by a solution of crude silylenol ether prepared in Step H (22 mmol) in dry dichloromethane (10 mL). The resulting mixture was slowly warm up to 22°C and stirred 18 h. The reaction mixture was then washed with cold saturated ammonium chloride, cold water, saturated sodium bicarbonate and brine. After drying (MgSO4) and evaporation of the solvent under reduced pressure, a red oil residue was obtained which was chromatographed on silica gel (5.2×11 cm) using a gradient of ethyl acetate in toluene (0:100 to 100:0). The title compound was obtained as a clear red oil (2 g, 24%). By 1 H NMR this product was pure β-isomer:
IR (NaCl, film) 1765 (C═O of lactam) and 1680-1700 cm-1 (broad, C═O of carbamate and C═O of thioester);
1 H NMR (200 MHz, CDCl3) δ: 0.04 (s, 6H, SiCH3), 0.85 (s, 9H, si-t-Bu), 0.94 (d, J=5.8 Hz, C H3 CHO), 1.6-2.2 and 2.6-2.8 (broad m, 6H, B--CH2 and CH2 -3' and CH2 -4' of pyrrolidyl), 2.95 (m, 1H, H-3), 3.2-3.5 (m, 2H, N--CH2 --5' of pyrrolydyl), 3.8 (m, 2H, H-4 and CH--2" of pyrrolidine), 4-4.2 (m, 1H, CH3 C HO), 4.6 (m, 2H, 5-CH2), 5.1-5.4 (m,2H, CH2 of allyl), 5.8-6.0 (m, 1H, CH of allyl), 7.1-7.4 (m, 3H, H-3 and H-5 of pyridine and CH of allyl), 7.6 (m, 1H, H-4 of pyridine) and 8.54 (m, 1H, H-6 of pyridine).
J. (3S,4S)-3-[(1'R)-1'-tert-Butyldimethylsilyloxyethyl]-4-[(1R)-1-carboxy-2-( N-allyloxycarbonyl-(2"S)-2"-pyrrolidinyl)ethyl]azetidin-2-one. ##STR515##
A solution of (3S,4R)-3-[(1'R)-1-tert-butyldimethyl silyloxyethyl]-4-[(1R)-1-(2-pyridyl)methylthiocarbonyl-2-(N-allyloxycarbon yl-(2"S)-2"-pyrrolidinyl)ethyl]azetidin-2-one (2 g, 3.56 mmol) in tetratrydrofuran (12 mL) was cooled to 5°C and treated slowly with 30% hydrogen peroxide (1.2 mL). Then 1.0M aqueous sodium hydroxide were added dropwise then the stirring was continued for another 30 min. The reaction mixture was diluted with hexanes and the aqueous phase was collected. The organic phase was extracted a second time with cold water, the combined aqueous extracts were washed with hexanes, cooled to 0°-5°C and acidified to pH 2 with 1.0N hydrochloric acid. The solution was extracted with ethyl acetate (2×) and the combined organic extract was washed with 1M aqueous sodium bisulfite and brine. After drying (MgSO4), evaporation of the solvent under vacuum gave 1.388 g of the crude acid as a semi-solid residue. Crystallization from a mixture of ethyl acetate and hexanes gave 1.24 g (79%) of the title acid as white solid: m.p.=153°-154°C;
[α]D24 =-2° (C=0.2, CHCl3);
IR (KBr) νmax : 1740 (C═O of β-lactam), 1705 (C═O of carbamate) and 1665 cm-1 C═O of carboxylic acid);
1 H NMR (200 MHz, CDCl3) δ: 0.05 and 0.06 (2s, 3H, SiCH3), 0.86 (s, 9H, Si-t-Bu), 1.23 (d, J=6.26 Hz, 3H, CH3 CHO) 1.6-2.2 (m, 5H, CH2 -3' and CH2 -4' of pyrrolidyl and one H of β-CH2), 2.65 (m, 1H, one H of β-CH2), 2.80 (m, 1H, H-3), 3.5 (m, 2H, N--CH2 of pyrrolidyl), 3.9 (m, 1H, H-4), 4.15 (m, 2H, CH of pyrrolidyl and CH3 C HO), 4.6 (m, 2H, CH2 of allyl), 5.3 (m, 2H, CH of allyl), 5.9-6.0 (m, 1H, CH of allyl), 6.1 (broad s, 1H, NH), Anal. Calcd. for C22 H38 N2 O6 Si: C 58.12; H 8.42; N 6.16 Found: C 57.52; H 8.33; N 6.04.
K. (3S,4R)-3-[(1'R)-1'-tert-Butyldimethylsilyloxyethyl]-4-{(1R)-1-[(N-allylox ycarbonyl-(2"S)-2"-pyrrolidinyl)methyl]-3-allyloxycarbonyl-2-oxopropyl}azet idin-2-one ##STR516##
A solution of (3S,4S)-3-[(1'R)-1'-tert-butyldimethylsilyloxyethyl]-4-[(1R)-1-carboxy-2-( N-allyloxycarbonyl)-(2"S)-2"-pyrrolidinyl)ethyl]azetidine-2-one (1.1 g, 2.42 mmol) in dry acetonitrile (21 mL) was treated at 22°C and under argon with 1,1-carbonyldiimidazole (0.450 g, 2.75 mmol) and the resulting mixture was stirred for 2 h. Evaporation of the solvent under reduced pressure gave the crude imidazolide which was then dissolved in dry acetonitrile (3 mL) and added to a mixture of magnesium monoallyl malonate (1.3 g, 4 mmol) in dry benzene (20 mL) and the resulting mixture was heated at 65°C for 18 h. The mixture was then diluted with ethyl acetate washed with 0.1N hydrochloric acid, cold water, saturated sodium bicarbonate, brine and dried (MgSO4). Evaporation of the solvent gave the crude title material as an oil which solidified on standing and was used as such in the next step. By 1 H NMR this product is a 1:1 mixture of keto and enol form:
IR (NaCl film) νmax : 1760 (C═O of β-lactam) and 1700 cm-1 (broad, allyl carbamate and allyl ester)
1 H NMR (200 MHz, CDCl3) δ: 1.09 and 1.17 ppm, 2d, J=6.22 Hz and 6.30 Hz, C H3 CHO).
L. (3S,4R)-3-[(1'R)-1'-tert-Butyldimethylsilyloxyethyl]-4-{(1'R)-1-[(N-allylo xycarbonyl-(2"S)-2"-pyrrolidinyl)methyl]-3-allyloxycarbonyl-3-diazo-2-oxopr opyl}-azetidin-2-one ##STR517##
A solution of crude (3S,4R)-3-[(1'R)-1'-tert-butyldimethylsilyloxyethyl]-4-{(1R)-1-[(N-alloxyc arbonyl-(2"S)-2"-pyrrolidinyl)methyl]-3-allyloxycarbonyl-2-oxopropyl}azetid in-2-one (2.3 mmol) in dry acetonitrile (5 mL) was treated at 0°-5°C with a solution of p-toluenesulfonyl azide (0.54 g, 2.76 mmol) in acetonitrile (7 mL). Triethylamine (0.38 mL, 2.76 mmol) was then added and the solution was stirred at 22°C for 2 h. The solvent was then evaporated under reduced pressure and the residue was triturated with a 1:1 cold (5°C) mixture of diethyl ether and hexanes (30 mL). The crystalline p-toluene sulfonamide was collected and washed with a mixture of diethyl ether and hexanes. The filtrate and washings were combined and evaporated under reduced pressure to give 1.57 g of the crude title material as an oil which was used as such in the next step. TLC (toluene:ethylacetate, 1:1) (silica gel) RF=0.49.
M. (3S,4R)-4-{(1R)-1-[(N-Allyloxycarbonyl-(2"S)-2"-pyrrolidinyl)methyl]-3-all yloxcarbonyl-3-diazo-2-oxopropyl}-3-[(1'R)-1'-hydroxyethyl]azetidin-2-one ##STR518##
A solution of crude (3S,4R)-3-[(1'R)-1'-tert-butyldimethylsilyloxyethyl]-4-{(1R)-1-[(N-allylox ycarbonyl-(2"S)-2"-pyrrolidinyl)methyl]-3-allyloxycarbonyl-3-diazo-2-oxopro pyl}azetidin-2-one (max 2.3 mmol) in ethanol (22 mL) was cooled to 0°-5°C and treated with 1N aqueous hydrochloric acid (12 mL). After 18H at 5°C, the pH was adjusted to 8 with solid sodium bicarbonate and the residue was diluted with ethyl acetate and washed with saturated aqueous sodium bicarbonate, brine and dried (MgSO4). Evaporation of the solvent and chromatography of the residue on silica gel (2.2×11 cm, elution with a gradient of ethyl acetate in toluene (10:90) to ethyl acetate followed by CH3 CN gave 0.75 g (74%, for 3 steps from the acid) of the title material as a beige foam:
IR (NaCl, film) νmax : 2140 (═N2), 1755 (C═O of β-lactam), 1710 and 1690 cm-1 (co of allyl);
1 H NMR (400 MHz, CDCl3) δ: 1.32 (d, J=6.27 Hz, 3H, C H3 CHO), 1.6-2.1 (m, 6H, CH2 C H2 CH2 N of pyrrolidinyl and CH2 -pyrrolidinyl), 2.77 (broad s, 1H, OH), 3.01 (d, 1H, J=7.44 Hz, H-3), 3.3-3.4 (m, 2H, CH2 --N of pyrrolidinyl), 3.8-4.2 (m, 4H, N--CH of pyrrolidinyl, CH3 C HO, H-4, H-1 of oxopropyl), 4.4-4.8 (2 m, 4H, CH2 of allyl), 5.2-5.5 and 5.8-6.0 (2 m, 4H and 2H, CH of allyl) and 6.5 ppm (m, 1H, NH).
N. Allyl (2R,4R,5R,6S)-4-[(N-allyloxycarbonyl-(2"S)-2"-pyrrolidinyl)methyl]-6-[(1'R )-1'-hydroxyethyl]-3,7-dioxo-1-azabicyclo[3.2.0]heptane-2-carboxylate ##STR519##
A solution of (3S,4R)-4-{(1R)-1-{(N-allyloxycarbonyl-(2"S)-2"-pyrrolidinyl)methyl]-3-all yloxocarbonyl-3-diazo-2-oxopropyl}-3-[(1'R)-1'-hydroxyethyl]azetidin-2-one (0.421 g, 1.0 mmol) in dry benzene (18 mL) was treated under argon with rhodium octanoate dimer (15 mg) and heated under reflux for 20 min. Evaporation of the solvent under reduced pressure gave the bicyclic ketone as an oil which was used as such in the next step:
IR (NaCl, film) νmax : 1765 (C═O of β-lactam), 1740 (Sh) and 1670 cm-1 ;
1 H NMR (200 MHz, CDCl3) δ: 1.47 (d, 3H, J=6.05 Hz, C H3 CHO), 1.5-2.1 (m, 6H, C H2 C H2 CH2 N of pyrrolidinyl and CH2 -pyrrolidinyl), 2.5-2.7 (m, 1H, H4), 3.2-3.7 (m, CH2 --N of pyrrolidinyl and H-6), 3.9-4.3 (m, 2H, N--CH of pyrrolidinyl, CH3 CHO), 4.41 (dd, JH5,H6 =2.84, JH5,H4 =9.0 Hz, 1H, H-5), 4.5-4.7 (m, 4H, CH2 of allyl), 5.2-5.4 and 5.9-6.0 (2 m, 4H and 2H, CH of allyl).
O. Allyl (4R,5S,6S)-4-[(N-allyloxycarbonyl-(2"S)-2"-pyrrolidinyl)methyl]-3-[N-allyl oxycarbonyl-(2-aminoethyl)thio]-6-[(1'R)-1'-hydroxyethyl]-7-oxo-1-azabicylo [3.2.0]hept-2-ene-2-carboxylate ##STR520##
A solution of allyl (2R,4R,5R,6S)-4-[(N-allyloxycarbonyl-(2"S)-2"-pyrrolidinyl)methyl]-6-[(1'R )-1'-hydroxyethyl]-3,7-dioxo-1-azabicyclo[3.2.0]heptane-2-carboxylate (0.785 mmol, prepared by cyclization of 0.330 g, 0.785 mmol of the diazo precursor) in dry acetonitrile (10 mL) was treated at 0°-5° C. and under argon with diphenyl chlorophosphate (0.18 mL, 0.863 mmol) and N,N-diisopropylethylamine (0.15 mL, 0.863 mmol) added simultaneously over 1 min. A small crystal of 4-N,N-dimethylaminopyridine was then added and the mixture was stirred for 1.5 h. Trimethylsilylchloride (0.110 mL, 0.863 mmol) was then added followed by N,N-diisopropylethylamine (0.150 mL, 0.863 mmol) and the reaction mixture was stirred 2 h at 5°C More N,N-diisopropylethylamine (0.275 mL, 1.57 mmol) was added followed by a solution of allyl 2-mercaptoethyl carbamate (0.25 g, 1.5 mmol) in acetonitrile (1 mL) and the resulting mixture was stirred at 0°-5°C for 24 h. The reaction mixture was then diluted with ethyl acetate (50 mL), washed with cold 0.01N aqueous hydrochloric acid (50 mL), diluted sodium bisulfite, water, saturated sodium bicarbonate, brine and dried (MgSO4). Evaporation of the solvent under reduced pressure gave an oil which was chromatographed on silica gel (2.5×10 cm). Elution with a gradient of ethyl acetate in toluene (0:100 to ethyl acetate) gave 0.10 g (22%) of the title carbapenem as an oil:
IR (NaCl, film) νmax : 1775 (C═O of β-lactam) and 1700 cm-1 (broad, C═O of allyl);
1 H NMR (200 MHz, CDCl3) δ: 1.44 (d, 3H, CH3 CHO), 1.5-2.1 (m, 6H, C H2 C H2 CH2 N of pyrrolidinyl and 4- CH2 pyrrolidinyl), 2.7-3.0 (2m, 2H, S--CH2), 3.1-3.6 (m, 5H, CH2 NH2, CH2 N (pyrrolidinyl) and H-4), 3.9-4.3 (2m, 2H, CH3 CHO and CHN of pyrrolydinyl), 4.35 (dd, JH5,H6 =3.10 Hz, JH5,H6 =10.37 Hz, 1H, H-5), 4.5-4.9 (2m, 6H, CH2 of allyl), 5-5.5 and 5.8-6.1 ppm (2m, 9H, CH of allyl).
P. (4R,5S,6S)-3-[(2-Aminoethyl)thiol]-6-[(1'R)-1'-hydroxyethyl]-4-[(2"S)-(2"- pyrrolidinyl)methyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid acetic acid salt ##STR521##
A solution of allyl (4R,5S,6S)-4-[(N-allyloxocarbonyl-(2"S)-2"-pyrrolidinyl)methyl]-3-[N-allyl oxycarbonyl-(2-aminoethyl)thio]-6-[(1'R)-1'-hydroxyethyl]-7-oxo-1-azabicycl o[3.2.0]hept-2-ene-2-carboxylate (0.1 g, 0.177 mmol) in dry dichloromethane (10 mL) was treated at 22°C and under argon with a solution of tri-n-butyltinhydride (0.206 g, 0.708 mmol) in dichloromethane (1 mL), acetic acid (0.40 mL, 0.708 mmol) and tetrakis(triphenylphosphine)palladium[[O] (20 mg). After 20 min, the reaction mixture was extracted with water (2×10 mL) and the combined aqueous extract was washed with dichloromethane (20 mL). After concentration under reduced pressure the aqueous extract was chromatographed on reversed phase silica gel (μ-Bondapak C-18, 2×10 cm) using 0.01N acetic acid as eluent. Pure fractions were freeze-dried and gave 55 mg (79%) of the title compound as an off-white amorphous solid:
Purity by HPLC: 95.0% on μ-Bondapak C-18, 3.9 mm×30 mm, solution 5% CH3 CN--H2 O, pH 7.4 phosphate buffer, flow rate 1 mLin, UV detector 300 mn, retention time 8.48 min;
UV (H2 O, pH 7.4 phosphate buffer) λmax : 294 nm (6953);
IR (KBr) νmax : 1760 (C═O of β-lactam) and 1600 cm-1 (C═O of carboxylate);
1 H NMR (400 MHz, D2 O) δ: 1.33 (d, J=6.35 Hz, 3H, C H3 CHO), 1.73-1.82 and 2.36-2.43 (2×m, 2H, β-CH2), 2.00-2.20 (m, 4H, CH2 -3' and CH2 -4' of pyrrolidyl), 2.90-2.97 and 3.08-3.15 (2m, 3H, S--CH2 and H-6), 3.26-3.39 (m, 4H, C H2 --NH2 and CH2 --N of pyrrolidyl), 3.50-3.53 (m, 1H, H-5), 3.58-3.65 (m, 1H, N--CH of pyrrolidyl) and 4.24-4.32 ppm (m, 2H, CH3 C HO and H-5).
Following the general procedures of the foregoing text and examples with the appropriately selected starting materials and reagents as exemplified by the present invention, the following 4-substituted alkyl carbapenem compounds having the formula and 1 H NMR data as indicated in the Tables were produced.
| __________________________________________________________________________ |
| EX. |
| NO. |
| STRUCTURES NMR DATA |
| __________________________________________________________________________ |
| 158 |
| ##STR522## 1 H NMR(200 MHz, D2 O)δ: |
| 1.32(d, J=6.38Hz, 3H, CH3 CHO), |
| 1.3-1.9 (m, 8H, CH2 -1,2,3 and 4 of |
| pentyl), 2.8-3.3(m, 4H, S CH2 CH2 |
| CN), 3.18(t, J=6.7Hz, 2H, CH2 |
| NH2), 3.35(overlapping with H-6, 1H, |
| H- 4), 3.38(dd, JH6,H5 =2.44Hz, |
| JH6,H1 =6.15Hz, 1H, H-6), 4.24(dd |
| overlapping with CH3 CHO, JH5,H6 |
| =2.44Hz, 1H, H-5) and 4.27 ppm(m, 1H, |
| CH3 CHO). |
| 159 |
| ##STR523## 1 H NMR(200 MHz, D2 O)δ: |
| 1.32(d, J=6.38Hz, 3H, CH3 CHO), |
| 1.3-1.9 (m, 8H, CH2 -1,2,3 and 4 of |
| pentyl), 2.8-2.9(m, 2H, CH2 CN), 2.9- |
| 3.2(m, 2H, SCH2), 3.31(t, J=6.8Hz, 2H, |
| CH2 N), 3.38(dd, JH6,H5 =2.24Hz, |
| JH6,H1 =6.24Hz, 1H, H-6), |
| 3.38(overlapping with H6, 1H, H-4), |
| 4.24(dd, overlapping with CH3 CHO, |
| JH5,H6 = 2.24Hz, 1H, H-5), 4.27(m, 1H, |
| CH3 CHO), and 7.8 ppm(s, 1H, CHNH). |
| 160 |
| ##STR524## 1 H NMR (D2 O, 200 MHz)δ: |
| 4.337(1H, dd, J=2.8Hz, J=9.3Hz, H-5), |
| 4.35-4.25(1H, m, H-1'), 3.902, 3.814, |
| 3.785, 3,696(2H, ABq, J=17.6Hz, SCH2 |
| CN), 3.507-3.409(1H, m, H-4), 3.448(1H, dd, |
| J=2.8 Hz, J=6.3Hz, H-6), 3.093, 3.057, |
| 3.021(2H, 3 lines, J=7.3Hz, CH2 N), |
| 2.1-1.40(4H, m, CH2 CH2 -4) and |
| 1.340 ppm(3H, d, J=6.4Hz, CH3). |
| 161 |
| ##STR525## 1 H NMR(200 MHz, D2 O)δ: |
| 1.33(d, J=6.38Hz, 3H, CH3 CHO), |
| 1.3-2.0(m, 6H, CH2 -1,2 and 3 of |
| butyl), 3.02(t, J=7.5Hz, 2H, |
| CH2NH2), 3.4 (m, overlapping with |
| H-6, 1H, H-4), 3.43(dd, JH6,H5 |
| =2.63Hz, JH6, H1 = 6.25Hz, 1H, H-6), |
| 3.79(ABq, JAB =17.6Hz, |
| Δν=14.7Hz, 2H, SCH2), 4.29(m, |
| 1H, CH3 CHO) and 4.32 ppm(dd, |
| JH5,H6 =2.63Hz, JH5,H4 =9.32 Hz, |
| 1H, H-5). |
| 162 |
| ##STR526## 1 H NMR(200 MHz, D2 O)δ: |
| 1.33(d, J=6.35Hz, 3H, CH3 CHO), |
| 1.3-1.9(m, 8H, CH2 -1,2,3 and 4 of |
| pentyl), 2.85(s, 6H, NCH3), 2.8-3.2(m, |
| 6H, S CH2 CH2 CN and CH2 -5 |
| of pentyl), 3.36(overlapping with H-6, 1H, |
| H-4), 3.38(dd, JH6, H5 =2.50Hz, |
| JH6,H1 =6.20Hz, 1H, H-6), 4.24(dd, |
| overlapping CH3 CHO, JH5,H6 |
| =2.50Hz, 1H, H-5) and 4.27 ppm(m, 1H, |
| CH3 CHO). |
| 163 |
| ##STR527## 1 H NMR(200 MHz, D2 O)δ: |
| 1.29(d, J=6.36Hz, 3H, CH3 CHO), |
| 1.2-1.8(m, 8H, CH2,1,2,3 and 4 of |
| pentyl), 2.97(t, J=7.6Hz, 2H, CH2 |
| N3), 3.14 (broad t, J=8.5Hz, 1H, H-4), |
| 3.29(dd, JH6,H5 =2.47Hz, JH6,H1 |
| =6.24 Hz, 1H, H-6), 4.05(dd overlapping |
| with SCH2, JH5,H6 =2.47Hz, |
| JH5,H4 = 9.34Hz, 1H, H-5), 4.14(ABq, |
| JAB =14.26Hz, Δν=21.7Hz, 2H, |
| SCH2), 4.21(m, 1H, CH3 CHO), |
| 7.37(m, 1H, H-5 of pyridine), 7.52(d, J=7.9 |
| z, 1H, H-3 of pyridine), 7.86(m, 1H, H-4 of |
| pyridine), and 8.46 ppm(m, 1H, H-6 of |
| pyridine). |
| 164 |
| ##STR528## 1 H NMR(200 MHz, D2 O)δ: |
| 1.28(d, J=6.34Hz, 3H, CH3 CHO), |
| 1.2-1.7 (m, 8H, CH2 -1,2,3 and 4 of |
| pentyl), 3.15(broad t, 1H, H-4), 3.2- |
| 3.4(m, 3H, H-6 and CH2 NH2 |
| overlapping)4.7(overlapping with SCH2, |
| H, H-6), 4.13(ABq, JAB =14.32, |
| Δν=22.6Hz, 2H, SCH2), 4.21(m, |
| H, CH3 CHO), 7.36(m, 1H, H-5 of |
| pyridine)7.52(d, J=7.82Hz, 1H, H-3 of |
| pyridine), 7.77(s, 1H, CHNH), 7.85(m, 1H, |
| H-4 of pyridine) and 8.46 ppm(d, J=8.5Hz, |
| 1H, H-6 of pyridine). |
| 165 |
| ##STR529## 1 H NMR(D2 O, 200 MHz)δ: |
| 4.35-4.20(2H, m, H-1' and H-5), 3.80-3.55 |
| (2H, m, CH2 O), 3.531-3.41(1H, m, |
| H-4), 3.465(1H, dd, J=2.7Hz, J=6.0Hz, H-6), |
| 3.25-3.12, 3.03-2.89(2H, 2 sets of m, |
| SCH2), 2.89- 2.81(2H, m, CH2 CN), |
| 2.15-1.95, 1.82-1.70(2H, 2 sets of m, |
| CH2 -4) and 1.322 ppm(3H, d, J=6.4Hz, |
| CH3). |
| 166 |
| ##STR530## 1 H NMR(D2 O)δ 1.37(d, 3H, |
| 6.4Hz), 1.66-1.74(m, 1H), 2.14-2.48 (m, |
| 3H), 2.91-3.42(m, SH), 3.51(dd, 1H, J=2.7, |
| 6.0Hz), 4.28(dd, 1H, J=2.7, 8.3Hz), |
| 4.31(dq, 1H, J=6.0, 6.4Hz)HPLC purity 95%; |
| half life(phosphate buffer, pH 7.4, 0.07M, |
| 37°C)86 h. |
| 167 |
| ##STR531## 1 H NMR(200 MHz, D2 O)δ: |
| 1.32(d, J=6.37Hz, 3H, CH3 CHO), |
| 1.3-2.0(m, 6H, CH2 -1,2 and 3 of |
| butyl),3.3-3.5(m, 4H, H-4, H-6 and |
| CH2 NH2 overlapping), 3.8(ABq |
| partially exchanged, SCH2 CN), |
| 4.2-4.4(m, 2H, H-5 and CH3 CHO), and |
| 7.8 ppm(s, 1H, CHNH). |
| 168 |
| ##STR532## 1 H NMR(200 MHz, CDCl3 7.24 |
| δ): -0.12, -0.14(2s, 6H, |
| Si(CH3)2), 0.06 (s, 6H, |
| Si(CH3)2), 0.72, 0.87(2m, |
| 2×9H, Sic(CH3)2), 1.22(d, |
| 3H, CH3, J=6.56Hz), 1.5-1.6; |
| 1.79-1.96(m, 2H, CH2), |
| 3.2-3.58(overlap, 4H, CH2 O, H-4, |
| H-6), 4.23(dd, 1H, H-5, J5,6 =2.72Hz, |
| J4,5 =9.7Hz), 4.25(m, 1H, H-1'), |
| 4.63-4.85(m, 2H, OCH2, allyl), |
| 5.2-5.47(m, 2H, CH2, allyl), |
| 5.84-6.03(m, 1H, CH, allyl), 7.26(B of |
| A2 B2, 2H, H- 3,5, py), 8.5(A of |
| A2 B2, 2H, H-2,6 py). |
| 169 |
| ##STR533## 1 H NMR(D2 O 200 MHz)δ: |
| 4.34-4.216(2H, m, H-1' and H-5), 4.301, |
| 4.286(d, J=2.9Hz, part of H-5), 3.579(3H, |
| s, OCH3), 3.486, 3.473 (d, J=2.7Hz, |
| part of H-6), 3.49-3.34(2H, m, H-6 and |
| H-4), 3.235- 3.104, 3.04-2.90(2H, 2 sets of |
| m, SCH2), 2.90-2.764(4H, m, CH2 N |
| nd CH2 CN), 2.640(3H, s, NCH3), |
| 2.20-2.03, 1.86-1.65(2H, 2 sets of m, |
| CH2 -4) and 1.331 ppm(3H, d, J=6.4Hz, |
| CH3). |
| 170 |
| ##STR534## 1 H NMR(D2 O, 200 MHz)δ: |
| 8.459-8.427(2H, m, pyridine H), 7.505- |
| 7.470(2H, m, pyridine H), 4.371(1H, dd, |
| J=2.9Hz, J=9.9Hz H-5), 4.389-4.23(1H, m, |
| H-1'), 3.434(1H, dd, J=2.9Hz, J=6.2Hz, H6), |
| .304-3.20(1H, m, H-4), 2.839, 2.805, |
| 2.774(2H, 3 lines, CH2 N), 1.8-1.4(4H, |
| m, CH2 CH2 -4) and 1.316 ppm(3H, |
| d, J=6.4Hz, CH3). |
| 171 |
| ##STR535## 1 H NMR(200 MHz, CDCl3 7.24 |
| δ): 0.06(s, 6H, 6H(CH3)2), |
| 0.87(s, 9H, SiC(CH3)3), 1.27(d, |
| 3H, CH3, J=6.14Hz), 1.52-1.99(m, 2H, |
| CH2), 2.53-3.42(overlap, 8H, CH2 |
| N SCH2, CH2 CN, H-4, H-6), |
| 3.47(s, 4H, N(CH2)2, pyrroline), |
| 4.18(m, 1H, H-5), 4.21(m, 1H, H-1'), 4.61- |
| 4.84(m, 2H, OCH2, allyl), 5.2-5.48(m, |
| 2H, CH2, allyl), 5.77(s, 2H, HCCH, |
| pyrroline), 5.84-6.03(m, 1H, CH, allyl). |
| 172 |
| ##STR536## 1 H NMR(D2 O, 200 MHz)δ: |
| 4.311-4.20(2H, m, H-5 and H-1'), 3.773 (2H, |
| s , NCH2 CO2), 3.432, 3.329(2 |
| lines, J=2.5Hz, part of H-6), 3.50-3.20(5H, |
| H-4, H-6, 1H of SCH2, CH2 N), |
| 3.21-3.08(1H, m, 1H of SCH2), |
| 2.959(3H, s, NCH3), 2.893-2.796(2H, m, |
| CH2 CN), 2.40-2.20, 2.10-1.90(2H, 2 |
| sets of m, CH2 -4) and 1.330 ppm(3H, |
| d, J=6.3Hz, CH3). |
| 173 |
| ##STR537## 1 H NMR(200 MHz, D2 O)δ: |
| 1.33(d, J=6.37Hz, 3H, CH3 CHO), |
| 1.3-1.9 (m, 6H, CH2 -1,2 and 3 of |
| butyl), 2.75-2.9(m, 2H, CH2 CN), |
| 2.9-3.3 (m, 2H, SCH2), 6.5(t, |
| J=3.27Hz, CH2 -4 of butyl), 3.3-3.5(m, |
| 2H, H-6 and H-4 overlapping), 3.74(s, 2H, |
| CH2 NH2) and 4.2-4.4 ppm(m, 2H, |
| H-5 and CH3 CHO). |
| 174 |
| ##STR538## 1 H NMR(CDCl3, 200 MHz)δ: |
| 8.54(2H, d, J: 4.83, aromatic-H), 7.07 (1H, |
| t, J: 4.88, aromatic H), 6.02-4.60(5H, |
| allylic pattern), 4.24 (1H, m, H-4), |
| 4.11(1H, m, H-1' ), 3.95(1H, dd, J: 2.71, |
| 8.48, H-5), (1H, m, H-4), 4.11(1H, m, H-1' |
| ), 3.95(1H, dd, J: 2.71, 8.48, H-5), |
| 3.42(2H, m, CH2 N3), 3.36(1H, dd, |
| J: 8.16, 2.68, H-6), 2.15-1.50 (3H, 2m, |
| CH2, 1.96: OH), 1.41(3H, d, J: 6.25, |
| 1'-CH3). |
| 175 |
| ##STR539## 1 H NMR(D2 O, 200 MHz)δ: |
| 4.3-4.22(1H, m, H-1' and part of H-5), |
| 4.259(d, J=2.9Hz, part of H-5), 3.896, |
| 3.869, 3.842(2H, 3 lines, CH2 O), |
| 3.443(1H, dd, J=2.5Hz, J=6.6Hz, H-6), |
| 3.46-3.36(1H, m, H-4), 3.21-3.05(5H, m, |
| CH2N and 1H of SCH2), |
| 3.05-2.88(1H, m, 1H of SCH2), |
| 2.88-2.80(2H, m, CH2 CN), 2.75(3H, s, |
| NCH3), 2.3-2.15, 2.0-1.8(2H, 2 sets of |
| m, CH2 -4) and 1.338 ppm(3H, d, |
| J=6.4Hz, CH3). |
| 176 |
| ##STR540## 1 H NMR(200 MHz, D2 O)δ: |
| 1.36(d, 3H, CH3 ; J=6.37Hz), |
| 1.63-1.82; 1.99-2.13(m, 2H CH2), |
| 2.81-2.89(m, 2H, CH2 CN), 2.91-2.99; |
| 3.02- 3.17(m, 2H, SCH2), 3.35(m |
| centre, 3H, CH2 NH, H-4), 3.59(dd, 7H, |
| -6, J5,6 =2.67Hz, J6.1' =5.94Hz), |
| 4.06(s, 2H, CH2 N3), 4.29(dd, 1H, |
| -5, J4,5 =10.04Hz), 4.31(m, 1H, |
| H-1'). |
| 177 |
| ##STR541## 1 H NMR(200 MHz, D2 O)δ: |
| 1.34(d, J=6.35Hz, 3H, CH3 CHO), |
| 2.0-2.4(m, 2H, CH2 -4), 2.7-3.2(m, 4H, |
| SC H2 C H2 CN), 3.19(s, 9H, |
| N(CH3)3), 3.3- 3.7(m, 4H, H-6, |
| H-4 and CH2 N(CH3)3), |
| 4.28(m, 1H, CH3 CHO) and 4.31 ppm(dd, |
| JH5,H6 =3.05Hz, JH5,H4 =9.90Hz, |
| 1H, H-5). |
| 178 |
| ##STR542## 1 H NMR(D2 O, 200 MHz)δ: |
| 4.4-4.2(2H, m, H-1' and H-5), 3.43(1H, dd, |
| J=2.7Hz, J=6.0Hz, H-6), 3.46-3.2(5H, |
| CH2 N, CH2 N and |
| H-4), 3.2-2.93(2H, m, SCH2), 2.90(6H, |
| s, N(CH3)2), 1.92(2.3H, s, |
| CH3 CO2), 2.0-1.35(4H, m, |
| CH2 CH2 -4) and 1.319 ppm(3H, d, |
| J=6.4Hz, CH3). |
| 179 |
| ##STR543## 1 HMR (D2 O, 200 MHz)δ: |
| 4.286(1H, dd, J=2.8Hz, J=9.7Hz, H-5), |
| 4.35-4.27(1H, m, H-1'), 3.673(2H, t, |
| J=5.7Hz, CH2 N3), 3.426(1H, dd, |
| J=2.8Hz, J=6.6Hz, H-6), 3.44-3.35(1H, m, |
| H-1' ), 3.2-2.75 (8H, SCH2, CH2 N |
| and CH2 CN), 2.58(3H, s, NCH3), |
| 2.25-2.0, 1.9-1.7 (2H, 2 sets of m, |
| CH2 -4) and 1.342 ppm(3H, d, J=6.4Hz, |
| CH3). |
| 180 |
| ##STR544## 1 H NMR(200 MHz, D2 O)δ: |
| 1.37(d, 3H, CH3, J=6.4 Hz), 1.63-1.85; |
| .99-2.14(m, 2H, CH2), 2.57(t, 2H, |
| C(O)CH2, J=6.19Hz), 2.82-2.89 (m 2H, |
| CH2 CN), 2.93-3.0; 3.03-3.23(m, 2H, |
| SCH2), 3.31-3.42(m, 3H, CH2 NH, |
| H-4), 3.61(dd, 1H, H-6, J5,6 =2.72Hz, |
| J6,1' =6.96Hz), 3.64 (t, 2H, CH2 |
| N3), 4.3(dd, 1H, H-5, J4,5 |
| =10.01Hz), 4.32(m, 1H, H-1'). |
| 181 |
| ##STR545## 1 H NMR(200 MHz, D2 O)δ: |
| 1.32(d, J=6.36Hz, 3H, ( CH3 CHO), |
| 1.4-2.0 (m, 4H, CH2 -1 and 2 of |
| propyl), 3.13 and 3.30 (2×s, |
| 2×3H, N(CH3)2), 3.1-3.3(m, |
| 1H, H-4), 3.42(t, J=6.2Hz, 2H, CH2 |
| N3), 3.53(dd, JH6,H5 =2.91Hz, |
| JH6,H1 =5.93Hz, 1H, H-6), |
| 3.88(ABq2, JAB =15.2 Hz, |
| Δν=11.8Hz, 2H, SCH2), and |
| 4.2-4.4 ppm(m, 2H, H-5 and CH3 CHO). |
| 182 |
| ##STR546## 1 H NMR(D2 O, 200 MHz)δ: |
| 4.35-4.25(1H, m, H-1' ), 4.272(1H, dd, |
| J=2.7Hz, J=9.5Hz, H-5), 3.665(2H, s, |
| CH2 CO2), 3.452(1H, dd, J=2.7Hz, |
| J=6.2Hz, H-6), 3.5-3.2(5H, m, CH2 N, |
| CH2 N3, H-4), 3.2-3.0 (2H, m, |
| SCH2), 2.858(3H, s, CH3 N), |
| 2.0-1.5(4H, m, CH2 CH2 -4) and |
| 1.33S ppm(3H, d, J=6.4Hz, CH3). |
| 183 |
| ##STR547## 1 H NMR(D2 O, 200 MHz)δ: |
| 4.313-4.21(2H, m, H-1' and H-5), 3.7-3.58 |
| (2H, m, CH2 -guanidine), 3.424(1H, dd, |
| J=2.6Hz, J=6.8Hz, H-6), 3.5-3.05(7H, m, |
| H-1', CH2 N, SCH2), 3.05-2.86(2H, |
| m, CH2 CN), 2.84 (3H, s, NCH3), |
| 2.3-2.1, 2.1-2.9(2H, 2 sets of m, CH2 |
| -4), 1.92(3H, s, CH3 CHO2) and |
| 1.334 ppm(3H, d, J=6.3Hz, CH3). |
| 184 |
| ##STR548## 1 H NMR(D2 O, 200 MHz)δ: |
| 4.312, 4.299(d, J=2.6Hz part of H-5), |
| 4.34-4.21(m, part of H-5 and H-1'), |
| 3.410(1H, dd, J=2.6Hz, J=6.6 Hz, H-6), |
| 3.5-2.8(11H, H-4, CH2 N, SC2, |
| CH2 CN), 2.86-2.62. (3H, |
| 2s, NCH3), 1.933(3H, s, CH3 |
| CO2), 2.3-2.1, 2.0-1.8(2H, 2m, |
| CH2 -4) and 1.337 ppm(3H, d, J=6.3Hz, |
| CH3). |
| 185 |
| ##STR549## 1 NMR(200 MHz, D2 O)δ: |
| 1.39(d, 3H, CH3, J=6.28Hz), 1.74-1.79; |
| .05-2.11(m, 2H, CH2), 2.53(t, 2H, |
| C(O)CH2), 2.84-3.21(overlap, 4H, |
| SCH2, CH2 CN), 3.34-3.44(overlap, |
| 3H, CH2 NH, H-4), 3.61(m, 1H, H-6), |
| 3.88(t, 2H, CH2 OH, J=6.0Hz), 4.32(m, |
| 1H, H-5), 4.33(m, 1H, H-1'). |
| 186 |
| ##STR550## 1 H NMR δ 1.34(d, 3H, J=6.4Hz), |
| 1.62-1.81(m, 1H), 2.18(d quintets, 1H, |
| J=2.8, 7.9Hz), 2.42-2.54(m, 2H), |
| 2.85-3.41(m, 5H), 2.94(s, 3H), 3.07(s, 3H), |
| 3.48(dd, 1H, J=2.4, 5.6Hz); half-life |
| phosphate buffer, pH 7.4, 0.07M, 37° |
| C.)50 h; HPLC purity 94%. |
| 187 |
| ##STR551## 1 H NMR(200 MHz, D2 O)δ: |
| 1.37(d, 3H, CH3, J=6.34Hz), 1.73-1.91; |
| .09-2.16(m, 2H, CH2), |
| 2.78-3.5(overlap, 7H, CH2 NH, H-4), |
| 3.47 (dd, 1H, H-6, J6,1' =6.84Hz), |
| 4.31(m, 1H, H-1'), 4.32(m, 1H, H-5, |
| J5,6 =2.74Hz, J4,5 =9.08Hz). |
| 188 |
| ##STR552## 1 H NMR(D2 O, 200 MHz)δ: |
| 4.30-4.20(2H, m, H-1' and H-5), 3.420 (1H, |
| dd, J=2.5Hz, J=6.1Hz, H-6), 3.50-3.30(3H, |
| m, H-4 and CH2 N3), 3.20-2.90, |
| 2.90-2.75(2 sets of m, 4H, SCH2), |
| 2.171(3H, s, SCH3), 1.95-1.50(4H, m, |
| CH2 CH2 -4) and 1.331 ppm(3H, d, |
| J=6.4Hz, CH3). |
| 189 |
| ##STR553## 1 H NMR(200 MHz, D2 O)δ: |
| 1.35(d, J=6.37Hz, 3H, CH3 CHO), |
| 1.5-2.0 (m, 4H, CH2 -1 and 2 of |
| propyl), 2.8-3.3(m, 4H, S CH2 |
| CH2 CN), 3.14(s, 9H, NCH3), |
| 3.3-3.6(m, 4H, H-4, H-6 and CH2 -3 of |
| propyl) and 4.2- 4.4 ppm(m, 2H, H-5 and C |
| H3 CHO overlapping). |
| 190 |
| ##STR554## 1 H NMR(D2 O, 200 MHz)δ: |
| 4.35-4.20(1H, m, H-1'), 4.251(1H, dd, |
| J=2.6Hz, J=9.5Hz, H-5), 3.375(1H, dd, |
| J=2.6Hz, J=6.4Hz, H-6), 3.40-3.32(1H, m, |
| H-4), 3.16-2.85(4H, m, SCH2 and |
| CH2 N), 2.84-2.74 (2H, m, SCH2), |
| 2.166(3H, s, SCH3)1.94-1.54(4H, m, |
| CH2 CH2 -4) and 1.333 ppm(3H, d, |
| J=6.4Hz, CH3). |
| 191 |
| ##STR555## 1 H NMR(CDCl3, 200 MHz)δ: |
| 8.53-8.50(1H, m, H-6), 7.70-7.62(1H, m, H- |
| 4), 7.371, 7.33(1H, d, J=7.8Hz, pyridine |
| H-3), 7.226-7.164(1H, m, pyridine H-5), |
| 6.06-5.85(2H, m, vinylic H), |
| 5.470-5.221(4H, m, vinylic H), |
| 4.867-4.592(4H, 2 sets of m, allylic H), |
| 4.290(1H, dd, J=2.8Hz, J=9.6Hz, H-5), |
| 4.269, 4.198, 4.068, 3.999(2H, ABq, J=13.7 |
| Hz, CH2 -pyridine), 4.27-4.10(1H, m, |
| H-1'), 4.068-3.953(1H, m, H-4), 3.092(1H, |
| dd, J=2.8Hz, J=7.1Hz, H-6), 2.971, 2.957, |
| 2.883, 2.869, 2.531, 2.470, 2.443, |
| 2.382(2H, ABX, J=2.9Hz, J=12.2Hz, J=17.6Hz, |
| H2 CO2), 2.045(1H, bs, OH) and |
| 1.291 ppm(3H, d, J=6.3Hz, CH3). |
| 192 |
| ##STR556## 1 H NMR(D2 O, 200 MHz)δ: |
| 4.40-4.20(1H, m, H-1'), 4.239(1H, dd, J=2.7 |
| z, J=9.5Hz, H-5), 3.324(1H, dd, J=2.7, |
| J=6.4Hz, H-6), 3.40-3.20 (3H, m, H-4 and |
| CH2 CN), 3.2-2.87(2H, m, SCH2), |
| 2.85-2.74(2H, m, SCH2), 2.164(3H, s, |
| SCH3), 1.90-1.45(4H, m, CH2 |
| CH2 -4) and 1.322 ppm (3H, d, J=6.4Hz, |
| CH3). |
| 193 |
| ##STR557## 1 H NMR(D2 O, 200 MHz)δ: |
| 7.836, 7.815(1H, 2s, NCHN), 4.334-4.22(1H, |
| m, H-1'), 4.224(d, J=-2.5Hz, part of H-5), |
| 3.383 or 3.334(d, J=2.8 Hz, part of H-6), |
| 3.45-3.30(4H, H-4, H-6 and CH2 N), |
| 3.15-2.86, 2.86- 2.71(4H, 2 sets of m, |
| SCH2), 2.162(3H, s, SCH3), |
| 1.90-1.47(4H, m, CH2 CH2 -4) and |
| 1.322 ppm(3H, d, J=6.3Hz, CH3). |
| 194 |
| ##STR558## 1 H NMR(200 MHz, CDCl3 7.24 |
| δ): 1.29(d, 3H, CH3, J=6.11Hz), |
| 1.85- 2.02(m, 1H, CH2), 2.24-2.38(m, |
| 1H, CH2), 3.46(dd, 1H, H-6, J5,6 |
| = 2.54Hz, J6,1' =6.91Hz), 3.72(m, 1H, |
| H-4, J=1.96, 11.42Hz), 4.03- 4.36(overlap, |
| 1H, CH2 O), 4.08(dd overlap, 1H, H-5), |
| 4.32 (AB, 2H, SCH2, JAB =13.8Hz), |
| 4.48-4.82(m, 3H, OCH2 allyl, CH2 |
| O), 5.17-5.46(m, 2H, CH2, allyl), |
| 5.82-6.01(m, 1H, CH, allyl), 6.72 (d, 1H, |
| H-3', J3',4' =8.36Hz py), 6.83(m, 1H, |
| H-5' py), 7.16(m, 1H, H-5, py), 7.35(d, 1H, |
| H-3, J3,4 =7.81Hz py), 7.52(m, 1H, |
| H-4' py), 7.64(m, 1H, H-4, J3,4 |
| =J4,5 =7.69Hz, J4,6 =1.78Hz py), |
| 8.08 (m, 1H, H-6' py), 8.49(m, 1H, H-6, |
| J5,6 =5.57Hz, J4,6 =J3,6 |
| =0.92Hz py). |
| 195 |
| ##STR559## 1 H NMR(D2 O, 200 MHz)δ: |
| 4.334(1H, dd, J=2.6Hz, J=9.4Hz, H-5), |
| 3.50-4.20(1H, m, H-1'), 3.72-3.59(1H, m, |
| H-4), 3.465, 3.449, 3.430(1H, 3 lines, |
| H-6), 3.36-3.09(3H, m, CH2 N and 1H of |
| SCH2), 3.02-2.897(1H, m, 1H of |
| SCH2), 2.842, 2.822, 2.759, 2.739, |
| 2.369, 2.312, 2.287, 2.229(2H, ABX, |
| J=3.9Hz, J=11.6Hz, J=16.7Hz, CH2 CO), |
| and 1.242 ppm(3H, d, J=6.4Hz, CH3). |
| 196 |
| ##STR560## 1 H NMR(200 MHz, D2 O)δ: |
| 1.32(d, J=6.34Hz, 3H, CH3 CHO), |
| 1.4-2.0 (m, 4H, CH2 -1 and 2 of |
| propyl), 2.3-2.7(m, 2H, CH2 -3 of |
| azetidine), 2.8-3.2(m, 4H, S CH2 |
| CH2 CN), 3.25(broad t, J=7Hz, 2H, |
| CH2 -3 of propyl), 3.37(dd, |
| JH6,H5 =2.78Hz, JH6,H1 =6.38Hz, |
| 1H, H-6), 3.4 (m overlapping with H-6, 1H, |
| H-4) and 4.0-4.4 ppm(m, 6H, H-5, CH3 |
| CHO and CH2 2-2 and 4 of azetidine |
| overlapping). |
| 197 |
| ##STR561## 1 H NMR(D2 O, 200 MHz)δ: |
| 8.47-8.44(1H, m, aromatic H), 7.88-7.79 |
| (1H, m, aromatic H), 7.490, 7.450(1H, d, |
| J=7.9Hz, aromatic H), 7.39-7.3(1H, m, |
| aromatic H), 4.25-4.14(1H, m, H-1'), 4.21, |
| 4.14, 4.07, 4.00(2H, ABq, J=14.1Hz, |
| CH2 -pyridine), 4.119, 4.106(d, |
| J=2.6Hz, part of H-5), 3.331(1H, dd, |
| J=6.8Hz, J=2.6Hz, H-6), 3.31-2.95(3H, m, |
| H-4 and CH2), 2.0-1.8, 1.6-1.4(2H, 2m, |
| CH2 N) and 1.285(3H, d, J=6.4Hz, |
| CH3). |
| 198 |
| ##STR562## 1 H NMR(200 MHz, D2 O)δ:1.33 |
| (d, J=6.35Hz, 3H, CH3 CHO), |
| 1.4-2.0(m, 4H, CH2 -1 and 2 of |
| propyl), 2.8-3.5(m, 8H, SC H2 C |
| H2 CN, N CH2 CH2 OH and |
| CH2 -3 of propyl), 3.41(dd, |
| JH6,H1 =2.53Hz, JH6,H1 =6.67Hz, |
| 1H, H-6), 3.42(m, overlapping with H-6, 1H, |
| H-4), 3.84(t, J=5.2Hz, 2H, CH2 OH) and |
| 4.21-4.4 ppm(m, 2H, H-5 and CH3 |
| CHO). |
| 199 |
| ##STR563## 1 H NMR(200 MHz, D2 O)δ: |
| 1.33(d, J=6.28Hz, 3H, CH3 CHO), |
| 1.4-2.0 (m, 4H, CH2 -1 and 2 of |
| propyl), 2.8-3.6(m, 11H, H-4, N CH2 |
| CH2 OH, S CH2 CH2 CN, |
| CH2 -3 of propyl), 3, 42(dd |
| overlapping with the pre- vious m, |
| JH6,H5 =1.9Hz, JH6,H1 =7.1Hz, 1H, |
| H-6), 3.90(t, J=5.2Hz, 4H, CH2 OH), |
| and 4.2-4.4 ppm(m, 2H, H-5 and CH3 |
| CHO overlapping). |
| 200 |
| ##STR564## 1 H NMR(200 MHz, D2 O)δ: |
| 1.35(d, 3H, CH3, J=6.39Hz), 1.45-1.9 |
| (overlap, 6H, (CH2)3), |
| 2.83-3.37(overlap, 7H, H-4, CH2 CN, |
| SCH2, CH2 NH), 3.425(dd, 1H, H-6, |
| J5,6 =2.49Hz, J6,1 =5.93Hz), |
| 3.85(centre of m, 3H, CH, Cβ |
| H2), 4.25(dd, overlap 1H, H-5), |
| 4.29(m, 1H, H-1'). |
| 201 |
| ##STR565## 1 H NMR(D2 O, 200 MHz)δ: |
| 4.33-4.19(1H, m, H-1'), 4.248(1H, dd, J=2.5 |
| z, J=8.8Hz, H-5), 3.787, 3.755, 3.726(2H, 3 |
| lines, CH2 O), 3.400 (1H, dd, J=2.5Hz, |
| J=6.9Hz, H-6), 3.5-3.15(3H, m, H-4 and |
| CH2 N), 3.04-2.76(2H, m, SCH2), |
| 2.2-2.04, 1.87-1.68(2H, 2 sets of m, |
| CH2 at 4) and 1.33 ppm(3H, d, J=6.3Hz, |
| CH3). |
| 202 |
| ##STR566## 1 H NMR(200 MHz, D2 O)δ: |
| 1.33(d, J=6.32Hz, 3H, CH3 CHO), |
| 2.0-2.4(m, 8H, CH2 -1 of ethyl and |
| CH2 -3 and 3' of pyrrolidinium), |
| 2.8-3.2(m, 4H, S CH2 CH2 CN), |
| 3.2-3.8(m, 8H, H-4, H-6, CH2 -2 of |
| ethyl, CH2 -2 and 2' of pyrrolidinium), |
| 3.9-4.1(m, CH2 of allyl), 4.2-4.4(m, |
| 2H, H-5 and CH3 CHO overlapping), |
| 5.7-5.9 and 6.0-6.2 ppm(2m, 2H and 1H, CH |
| of allyl). |
| 203 |
| ##STR567## 1 H NMR(200 MHz, D2 O)δ: |
| 1.34(d, J=6.33Hz, 3H, CH3 CHO), |
| 1.7-2.3(m, 4H, CH2 CH2 N and |
| SCH2 CH2 CH2 CN), |
| 2.60-3.02(m, 4H, S CH2 CH2 |
| CH2 CN), 3.20-3.46(m, 4H, CH2 N, |
| H-6 and H-4) and 4.2-4.4 ppm(m, H-5, |
| CH3 CHO). |
| 204 |
| ##STR568## 1 H NMR(200 MHz, D2 O)δ: |
| 1.33(d, J=6.33Hz, 3H, CH3 CHO), |
| 1.4-2.0(m, 4H, CH2 -1 and 2 of |
| propyl), 2.8-3.2(m, 2H, SCH2), |
| 3.2-3.6(m, 6H, H-4, H-6, CH2 N3 |
| and CH2 N) and 4.2-4.4 ppm(m, 2H, H-5 |
| and CH3 CHO overlapping). |
| 205 |
| ##STR569## 1 H NMR(200 MHz, D2 O)δ: |
| 1.30(d, J=6.33Hz, 3H, CH3 CHO), |
| 1.4-2.1(m, 2H, CH2 -1 of aminoethyl), |
| 3.0-3.4(m, 3H, CH2 -2 of aminoethyl |
| and H-4), 3.35(dd, JH6,H5 =2.63Hz, |
| JH6,H1 =6.77Hz, 1H, H-6), 4.03(ABq, |
| JAB =14.1Hz, Δν=24.4Hz, 2H, |
| SCH2), 4.1(m overlapping with |
| SCH2, 1H, H-5), 4.22(m, 1H, CH3 |
| CHO), 7.43(m, 1H, H-5 of pyridine), 7.86(m, |
| H, H-4 of pyridine), 8.43(m, 1H, H-6 of |
| pyridine) and 8.47 ppm(d, J=1.9Hz, 1H, H-2 |
| of pyridine). |
| 206 |
| ##STR570## 1 H NMR(200 MHz, D2 O)δ: |
| 1.37(d, 3H, CH3, J=6.36Hz), 1.65-1.82; |
| .16-2.02(m, 2H, CH2), 2.81-2.92(m, 2H, |
| CH2 CN), 2.94-3.02; 3.03- 3.21(m, 2H, |
| SCH2), 3.26-3.51(overlap, 3H, CH2 |
| NH, H-4), 3.59(dd, 1H, H-6, J5,6 |
| =2.68Hz, J6,1' =6.02Hz), 3.87-4.04(m, |
| 2H, Cβ H2), 4.11 (t, 1H, |
| Cα H, Jα,β |
| =4.57Hz), 4.27-4.38(overlap, 2H, H-5, |
| H-1') |
| 207 |
| ##STR571## 1 H NMR(D2 O, 200 MHz)δ: |
| 4.275(1H, dd, J=2.7Hz, J=12.4Hz, H-5), |
| 4.35-4.2(1H, m, H-1'), 3.395(1H, dd, |
| J=2.7Hz, J=6.2Hz, H-6), 3.45-2.95(7H, |
| CH2 -guanidine, CH2 N, SCH2 |
| and H-4), 2.90(6H, s, N(CH3)2), |
| 1.92(1.8H, s, CH3 CO2), |
| 1.9-1.4(4H, m, CH2 CH2 -4) and |
| 1.32 ppm(3H, d, J=6.4Hz, CH3). |
| 208 |
| ##STR572## 1 H NMR(200 MHz, D2 O)δ: |
| 1.32(d, J=6.41Hz, 3H, CH3 CHO), |
| 1.6-2.2(m, 2H, CH2 CH2 OH), |
| 2.8-3.2(m, 2H, S CH2 CH2), |
| 3.3-3.8(m, 6H, H-6, H-4, SCH2 |
| CH2 N and CH2 CH2 OH) and |
| 4.2-4.4 ppm(m, 2H, H-5 and CH3 CHO |
| overlapping). |
| 209 |
| ##STR573## 1 H NMR(200 MHz, D2 O)δ: |
| 1.3(d, 3H, CH3, J=6.33Hz), 1.54-1.69; |
| 1.93-2.04(m, 2H, CH2), |
| 2.98-3.29(overlap, 3H, CH2 NH, H-4), |
| 3.36 (dd, 1H, H-6, J6,1' =6.78Hz)4.08(d |
| d, 1H, H-5, J5,6 =2.66Hz), 2.97, |
| 4.1(AB, 2H, SCH2, Jgem =14.72Hz), |
| 4.22(m, 1H, H-1'), 7.45(B of 4.1(AB, 2H, |
| SCH2, Jgem =14.72Hz), 4.22(m, 1H, |
| H-1'), 7.45(B of A2 B2, 2H, H-3,5 |
| py), 8.48(A of A2 B2, 2H, H-2, 6 |
| py, J=6.01Hz). |
| 210 |
| ##STR574## 1 H NMR(200 MHz, D2 O)δ: |
| 1.32(d, J=6.41Hz, 3H, CH3 CHO), |
| 1.6-2.2(m, 2H, CH2 CH2 OH, |
| 2.8-3.3(m, 2H, SCH2), 3.47(dd, |
| JH6,H5 =2.71Hz, JH6,H1 =6.0Hz, |
| 1H, CH3 CHO), 3.4-3.8(m, 5H, H-4, |
| CH2 N and CH2 O), 4.2- 4.4(m, 2H, |
| H-5 and CH3 CHO overlapping), 7.76 |
| and 7.84 ppm(2s, 1H, CHNH). |
| 211 |
| ##STR575## 1 H NMR(400 MHz, D2 O)δ |
| 1.28(d, 3H, J=6.3Hz), 3.35(m, 1H, J=5.7, |
| 2.1, 9.3Hz), 3.55(dd, 1H, J=6.1, 2.6Hz), |
| 3.77(dq, 2H, JA =3.78, JB =3.76, |
| JAB =12.0Hz, JAX =5.7, JBX |
| =2.1Hz), 4.07(dd, 1H, J=2.6, 9.3Hz), |
| 4.11(d, 1H, J=14.3Hz), 4.21(d, 1H, |
| J=14.3Hz), 4.23 (dq, 1H, J=6.3, 6.1Hz), |
| 7.35-8.47(m, 4H, arom.); HPLC purity 99%. |
| 212 |
| ##STR576## 1 H NMR(200 MHz, D2 O)δ: |
| 1.31(d, J=6.36Hz, 3H, CH3 CHO), |
| 1.3-1.9 (m, 4H, CH2 -1 and 2 of |
| propyl), 3.2-3.5(m, 4H, H-4, H-6 and |
| CH2 -3 of propyl), 4.03(ABq, JAB |
| =14.7Hz, Δν=27.8Hz, 2H, |
| SCH2), 4.13 (dd, JH5,H6 =2.50Hz, |
| JH5,H4 =9.30Hz, 1H, H-5), 4.24(m, 1H, |
| CH3 CHO), 7.09(s, 1H, H-5 of |
| imidazole) and 7.75 ppm(d, J=1.0Hz, 1H, H-2 |
| f imidazole). |
| 213 |
| ##STR577## 1 H NMR(200 MHz, D2 O)δ: |
| 1.33(d, J=6.4Hz, 3H, CH3 CHO), |
| 1.7-2.2(2m, 2H, CH2 -4), 2.8-3.7(m, |
| 8H, S CH2 CH2 CN, CH2 |
| N3, H-4, H-6), 4.2-4.4(m, 2H, H-5 and |
| CH3 CHO overlapping). |
| 214 |
| ##STR578## J=46.7Hz, CH2 F), 4.34-4.21(1H, m, |
| H-1'), 4.268(1H, dd, J=2.7Hz, J=9.4Hz, |
| H-5), 3.51-3.39(1H, m, H-4), 3.435(1H, dd, |
| J=2.7Hz, J=6.5Hz, H-6), 3.32-2.91(4H, m, |
| CH2 N and SCH2), 2.23-2.1, 1.97- |
| 1.81(2H, 2 sets of m, CH2 -4) and |
| 1.331 ppm(3H, d, J=6.4Hz, CH3). |
| 215 |
| ##STR579## 1 H NMR(D2 O, 200 MHz)δ: |
| 4.57-4.47(1H, 1 set of m, 1H of CH2 |
| F), 4.34-4.13(1H, m, H-1'), 4.271(1H, dd, |
| J=2.8Hz, J=8.9Hz, H-5), 3.426(1H, dd, |
| J=2.8Hz, J=6.8Hz, H-6), 3.50-2.88(5H, |
| SCH2, CH2 N, H-4), 2.21-2.05, |
| 1.88-1.69(2H, 2 sets of m, CH2 -4) and |
| 1.343 ppm (3H, d, J=6.3Hz, CH3). |
| 216 |
| ##STR580## 1 H NMR(D2 O)δ: |
| 4.15-4.30(2H, m, H-5, H-1'), 3.00-3.60[9H, |
| m, CH2 N3, H-4, H-6, (H-4, 2H-2, |
| 2H-6 of piperidine)], 1.40-2.30 [8H, m, |
| 2H-1",(2H-2", (2H-3, 2H-5 of piperidine)], |
| 1.31(3H, d, J: 6.35, CH31. |
| 217 |
| ##STR581## 1 H NMR(200 MHz, D2 O)δ: |
| 1.31(d, J=6.44Hz, 3H, CH3 CHO), |
| 1.3-1.9(m, 4H, CH2 -1 and 2 of |
| propyl), 3.0(broad t, 2H, CH2 |
| NH2), 3.3(m, 1H, H-4), 3.33(dd |
| overlapping with H-4, JH6,H5 =2.42Hz, |
| JH6,H1 =6.34Hz, 1H, H-6), 4.0(ABq, |
| JAB =14.65Hz, Δν=24.6Hz, 2H, |
| SCH2), 4.13(dd overlapping with |
| SCH2, JH5,H6 =2.42Hz, 1H, H-5), |
| 4.25(m, 1H, CH3 CHO), 7.09(s, 1H, H-5 |
| of imidazole) and 7.73 ppm(m, 1H, H-2 of |
| imidazole). |
| 218 |
| ##STR582## 1 H NMR(200 MHz, D2 O)δ: |
| 1.30(d, J=6.32Hz, 3H, CH3 CHO), |
| 1.3-1.8 (m, 4H, CH2 -1 and 2 of |
| propyl), 3.1-3.4(m, 4H, H-4, H-6 and |
| CH2 -3 of propyl), 4.0(ABq, JAB |
| =14.52Hz, Δν=23.0Hz, 2H, |
| SCH2), 4.13(dd overlapping with |
| SCH2, JH5,H6 =2.26Hz, 1H, H-5), |
| 4.24(m, 1H, CH3 CHO), 7.08(s, 1H, H-5 |
| of imidazole) and 7.7 ppm(s, 1H, H-2 of |
| imidazole) |
| 219 |
| ##STR583## 1 H NMR(200 MHz, D2 O)δ: |
| 1.32(d, J=6.38Hz, 3H, CH3 CHO), |
| 1.8-2.3(2m, 2H, CH2 -4), 2.5-3.3(m, |
| 6H, S CH2 CH2 CN, CH2CN), |
| 2.4-3.6(m, 2H, H-4 and H-6), 4.2-4.4 m, 2H, |
| H-5 and CH3 CHO overlapping). |
| 220 |
| ##STR584## 1 H NMR(200 MHz, D2 O)δ: |
| 1.32(d, J=6.37Hz, 3H, CH3 CHO), |
| 1.7-1.9 and 2.1-2.3(2×m, 2H, |
| CH2 CH2 N), 2.85(m, 2H, CH2 |
| CN), 3.04(s, 6H, N(CH3)2, |
| overlapping)2.9-3.6(m, 6H, SCH2, |
| CH2 N, H-6, H-4) and 4.2-4.4 ppm(m, |
| 2H, H-5 and CH3 CHO). |
| 221 |
| ##STR585## 1 H NMR(200 MHz, D2 O)δ: |
| 1.32(d, J=6.32Hz, 3H, CH3 CHO), |
| 1.4-1.9(m, 4H, CH2 -1 and 2 of |
| propyl), 1.93(s, CH3 CO2 H), |
| 2.8-3.2(m, 2H, SCH2), 3.2-3.7(m, 6H, |
| H-4, H-6, CH2 -3 of propyl and |
| CH2 -2 of ethylthio), 4.2-4.4(m, 2H, |
| H-5 and CH3 CHO overlapping), 7.75, |
| 7.80 and 7.84 ppm (3s, total 2H, CHNH). |
| 222 |
| ##STR586## 1 H NMR(200 MHz, D2 O)δ: |
| 1.31(d, J=6.33Hz, 3H, CH3 CHO), |
| 1.4-1.9 (m, 4H, CH2 -1 and 2 of |
| propyl), 1.94(s, CH3 CO2 H), |
| 2.8-3.2(m, 2H, SCH2), 3.2-3.7(m, 6H, |
| H-4, H-6, CH2 -3 of propyl and |
| CH2 -2 of ethylthio), 4.2-4.4(m, 2H, |
| H-5 and CH3 CHO overlapping), 7.5 and |
| 7.8 ppm(2s, total 1H, CHNH). |
| 223 |
| ##STR587## 1 HMR(200 MHz, D2 O)δ: |
| 1.33(d, J=6.33Hz, 3H, CH3 CHO), |
| 1.7-2.2(m, 2H, CH2 CH2 N3), |
| 2.8-3.2(m, 2H, SCH2), 3.3-3.7(m, 6H, |
| H-6, H-4, CH2 NH and CH2 |
| N3), and 4.2-4.35 ppm(m, 2H, H-5 and |
| CH3 CHO). |
| 224 |
| ##STR588## 1 H NMR(200 MHz, D2 O)δ: |
| 1.33(d, J=6.29Hz, 3H, CH3 CHO), |
| 1.7-2.2(m, 2H), CH2 CH2 N3), |
| 2.8-3.3(m, 2H, SCH2), 3.3-3.8(m, 6H, |
| H-4, H-6, CH2 NH and CH2 |
| N3), 4.2-4.4(m, 2H, H-5 and CH3 |
| CHO overlapping), 7.76 and 7.84 ppm(2s, 1H, |
| CHNH). |
| 225 |
| ##STR589## (D2 O)δ: 4.55-4.65 and |
| 3.95-4.10(4H, 2m, 2H-2, 2H-4 of azetidine), |
| 4.20-4.40(3H, m, H-1', H-5, CHS), |
| 3.35-3.50(3H, m, CH2 N3, H-6), |
| 3.15(1H, m, H-4), 1.50-1.95(4H, m, 2H-1" , |
| 2H-2"), 1.34(3H, d, J: 6.38, |
| CH31). |
| 226 |
| ##STR590## 1 H NMR(200 MHz, D2 O), δ: |
| 1.32(d, J=6.38Hz, 3H, CH3 CHO), |
| 1.8-2.3 (2m, 2H, CH2 -4), |
| 2.4-3.4(broad m, 7H, S CH2 CH2 |
| NH2, CH2 CN and H-4), 3.46(dd, |
| JH6,H5 =2.92Hz, JH6,1 =6.41Hz, |
| 1H, H-6) and 4.2 to 4.35 ppm (m, 2H, H-5 |
| and CH3 CHO overlapping). |
| 227 |
| ##STR591## 1 H NMR(200 MHz, D2 O)δ: |
| 1.33(d, J=6.26 3H, CH3 CHO), |
| 1.8-2.4(2m, 2H, CH2 -4), 2.4-3.6(broad |
| m, 8H, S CH2 CH2 N, CH2 CN, |
| H-4 and H-6), 4.2-4.4(m, 2H, H-5 and |
| CH3 C HO). |
| 228 |
| ##STR592## 1 H NMR(D2 O, 200 MHz)δ: |
| 9.706(0.5H, s, CHO); 5.16, 5.14, 5.12, |
| 5.10(0.5H, 4 lines, J=3.9Hz, CH(OD)2), |
| 4.324(0.5H, dd, J=2.8Hz, J=9.8Hz, H-5), |
| 4.250(0.5H, dd, J=2.8Hz, J=9.8Hz), |
| 4.30-4.13(1H, m, H-1'), 3.90-3.70(0.5H, m, |
| H-4 of CH2 CHO), 3.55-3.40(2.5H, |
| CH2 N3, H-4 of CH2 CH(OD).sub |
| .2), 3.21-2.74(4H, m, H-6, SCH2 and |
| CH2 CHO), 2.10- 1.75(1H, m, CH2 |
| CH(OD)2), 1.263(1.5H, d, J=6.4Hz, |
| CH3) and 1.171 ppm(1.5H, d, J=6.4Hz, |
| CH3). |
| 229 |
| ##STR593## 1 H NMR(200 MHz, CDCl3)δ: |
| 1.20-1.8(m, 4H, CH2 CH2 -4), |
| 1.30(d, 3H, J=6.37Hz, C H3 CHO), |
| 2.98(m, 2H, C H2 NH2), |
| 3.21-3.35(m, 2H, H-4 and H-6), 4.02-4.27(m, |
| 4H, CH2 S, H-5 and CH3 C HO), |
| 7.70(s, 1H, CH of triazol). By UV at |
| 37°C in a pH 7.4 phosphate buffer, |
| the half-life was measured to be 85 h. |
| 230 |
| ##STR594## 1 NMR(200 MHz, CDCl3)δ: |
| 1.24-1.80(m, 4H, CH2 CH2 -4), |
| 1.26(d, 3H, J=6.29Hz, CH3 CHO), |
| 3.21(m, 1H, H-4), 3.35(dd, 1H, J=6.03Hz, |
| J5,6 =2.40Hz, H-6), 3.55(m, 2H, |
| CH2 OH), 4.02-4.23(m, 4H, CH2 S, |
| H-5 and CH3 CHO), 7.80(9, 1H, CH of |
| triazol). By UV at 37°C in a pH |
| 7.4 phosphate buffer, the half-life was |
| measured to be 170 h. |
| 231 |
| ##STR595## 1 H NMR(200 MHz, D2 O)δ: |
| 1.38(d, 3H, CH3, J=6.54Hz), 1.42(d, |
| 3H, CH3, J=7.32Hz), 1.48(3H, |
| CH3), 1.59-1.75; 1.99-2.14(m, 2H, |
| CH2), 2.84-2.89(overlap, 2H, CH2 |
| CN), 2.92-3.22(overlap, 2H, SCH2), |
| 3.3- 3.42(overlap, 3H, CH2 N, H-4), |
| 3.59(dd, 1H, H-6, J5,6 =2.56Hz, |
| J6,1' = 5.88Hz), 3.9(br, 1H, |
| Cα H), 4.25-4.34(overlap, 3H, |
| H-5, H-1', Cα H). |
| 232 |
| ##STR596## 1 H NMR(200 MHz, CDCl3 7.24 |
| δ): 0.04(s, 6H, Si(CH3)2), |
| 0.85(s, 9H, SiC(CH3)3), 1.05(d, 3H, |
| CH3, J=6.18Hz), 1.51-1.66; 1.85-2.0(m, |
| 2H, CH2), 2.24(s, 3H, NCH3), |
| 2.29-2.5(m, 2H, CH2 N), 2.61(centre m, |
| 2H, CH2 CN), 2.9, 3.19(centre m, 2H, |
| SCH2), 3.07(dd, 1H, H-6, J6,1' |
| =5.66 Hz), 3.3(m, 1H, H-4, J=2.12, |
| 11.29Hz), 3.42, 3.58(AB, 2H, NCH2 Ph, |
| J=13.23Hz), 4.08(dd, 1H, H-5, J5,6 |
| =2.61, J4,5 =9.52Hz), 4.11(m, 1H, |
| H-1'), 4.61-4.81(m, 2H, OCH2, allyl), |
| 5.19-5.47(m, 2H, CH2, |
| allyl), 5.83-6.02(m, 1H, CH, allyl), |
| 7.2-7.36(m, 5H, phenyl). |
| 233 |
| ##STR597## 1 H NMR(200 MHz, D2 O)δ: |
| 1.34(d, J=6.40Hz, 3H, CH3 CHO), |
| 1.8-2.2 (m,2H, CH2 CH2 N3), |
| 3.3-3.7(m, 4H, H-6, H4 and CH2 |
| CH N3), 3.81(ABq, JAB |
| =17.6Hz, Δν=28.6Hz, 2H, |
| SCH2), 4.28(m, 1H, CH3 CHO) and |
| 4.35 ppm(dd, JH5,H6 =2.77Hz, |
| JH5,H4 =9.58Hz, 1H, H-5). |
| 234 |
| ##STR598## 1 H NMR(200 MHz, D2 O)δ: |
| 1.34(d, J=6.39Hz, 3H, CH3 CHO), |
| 1.7-2.3(m, 2H, CH2 CH2 N) |
| 3.2-3.6(m, 3H, H-4 and CH2 CH2N), 3.5(dd, |
| JH6,H5 =2.80Hz, JH6,H1 =6.80Hz, |
| 1H, H-6), 3.78(ABq, JAB =17.6Hz, |
| Δν=14.1Hz, 2H, SCH2), 4.29(m, |
| 1H, CH3 CHO) and 4.35 ppm(dd, |
| JH5,H6 =2.80Hz, JH5, H4 =9.64Hz, |
| 1H, H-5). |
| 235 |
| ##STR599## 1 H NMR(200 MHz, D2 O)δ: |
| 1.33(d, J=6.38Hz, 3H, CH3 CHO), |
| 1.7-2.2(m, 2H, CH2 CH2 N3), |
| 3.14 and 3.30(2d, 2×3H, NCH3), |
| 3.3-3.7(m, 4H, H-4, H-6 and CH2 |
| N3), 3.88(ABq, 2H, SCH2), and |
| 4.2-4.35 ppm(m, 2H, H-5 and CH3 |
| CHO). |
| 236 |
| ##STR600## 1 H NNR(200 MHz, D2 O)δ: |
| 1.32(d, J=6.38Hz, 3H, CH3 CHO), |
| 1.4-2.9(m, 4H, CH2 -1 and 2 of |
| propyl), 2.8-3.2(m, 4H, S CH2 |
| CH2 CN), 3.07(s, 3H, NCH3), |
| 3.2-3.6(m, 4H, H-4, H-6 and CH2 N |
| overlapping), 4.2-4.4(m, 2H, H-5 and |
| CH3 CHO), 7.78 and 7.89 ppm(2s, 1H, |
| CHNH). |
| 237 |
| ##STR601## 1 H NMR(200 MHz, D2 O)δ: |
| 1.31(d, J=6.38Hz, 3H, CH3 CHO), |
| 1.8-2.3(m, 2H, CH2 CH2 N), |
| 2.71(m, 3H, NCH3), 2.8-3.2(m, 6H, S |
| CH2 CH2 CN and CH2 |
| CH2 N), 3.35-3.5(m, 2H, H-6 and H-4), |
| and 4.2-4.4 ppm(m, H-5 and CH3 CHO). |
| 238 |
| ##STR602## 1 H NMR(200 MHz, D2 O)δ: |
| 1.33(d, J=6.35Hz, 3H, CH3 CHO), |
| 1.5-2.0(m, 4H, CH2 -1 and 2 of |
| propyl), 1.92(s. CH3 CO2 H), |
| 2.72(s, 3H, NCH3), 2.8- 3.4(m, 8H, |
| H-4, H6, CH2 -3 of propyl and S |
| CH C H2 NH2), 3.42(dd, |
| JH6,H5 = 2.72Hz, JH6,H1 =6.36Hz, |
| 1H, H-6), and 4.2-4.4 ppm(m, 2H, H-5 and |
| CH3 CHO). |
| 239 |
| ##STR603## 1 H NMR(200 MHz, D2 O)δ: |
| 1.33(d, J=6.34Hz, 3H, CH3 CHO), |
| 1.8-2.3(m, 2H, CH2 CH2 N3), |
| 2.75-2.9(m, 2H, CH2 CN), 2.9-3.2(m, |
| 2H, SCH2), 3.11(s, 3H, NCH3), |
| 3.25-3.5(m, 1H, H-4), 3.44(dd, JH6,H5 |
| =2.78Hz, JH6,H1 =6.97 Hz, 1H, H-6), |
| 3.65(broad t, 2H, CH2 N), 4.2-4.4(m, |
| 2H, H-5 and CH3 CHO and 7.9 ppm(s, |
| 1H, CHN). |
| 240 |
| ##STR604## 1 H NMR(D2 O, 400 MHz)δ: |
| 4.29(1H, quint J=6.6Hz, H-1'); 4.27(1H, dd, |
| =6.9Hz, J=2.4Hz, H-5); 3.66(2H, t, J=6.2Hz, |
| CH2 O); 3.48(1H, dd, J=6.0Hz, J=2.7Hz, |
| H-6); 3.36-3.26 and 3.24-3.10.(4H, 2 sets |
| of m, H- 4, CH2 N, part of SCH2); |
| 2.98-2.91(1H, m, part of SCH2); |
| 1.91-1.89 and 1.71-1.49(4H, 2 sets of m, |
| CH2 CH2 -4) and 1.34 ppm(3H, d, |
| J=6.4Hz, CH3). |
| 241 |
| ##STR605## 1 H NMR(200 MHz, D2 O)δ: |
| 1.32(d, J=6.34Hz, 3H, CH3 CHO), |
| 1.4-2.0(m, 4H, CH2 -1 and 2 of |
| propyl), 2.85(s, 6H, NCH3), 2.8-3.3(m, |
| 6H, SC H2 CH2 CN and CH2 -3 |
| of propyl), 3.40(dd, JH6,H5 =2.7Hz, |
| JH6,H1 =6.5Hz, 1H, H-6), 3.4-3.5(m |
| overlapping with H-6, 1H, H-4), and |
| 4.2-4.35 ppm (m, 2H, H-5 and CH3 C |
| HO). |
| 242 |
| ##STR606## 1 H NMR(200 MHz, D2 O)δ: |
| 1.34(d, J=6.33Hz, 3H, C H3 CHO), |
| 1.5-2.0(m, 4H, CH2 -1 and 2 of |
| propyl), 2.56(s, 3H, CH3 of |
| oxadiazole), 3.3-3.5(m, 4H, H-4, H-6 and |
| CH2 -3 of propyl), 4.2-4.4(m, 2H, H-5 |
| and CH3 CHO), and 4.56 ppm(ABq, |
| JAB =13.91Hz, Δν=24.5Hz, 2H, |
| SCH2). |
| 243 |
| ##STR607## 1 H NMR(200 MHz, D2 O)δ: |
| 1.33(d, J=6.36Hz, 3H, CH3 CHO), |
| 1.5-2.0(m, 4H, CH2 -1 and 2 of |
| propyl), 2.56(s, 3H, CH3 of |
| oxadiazole), 3.04(t, J=7.1Hz, 2H, CH2 |
| -3 of propyl), 3.3-3.5(m, 2H, H-4 and H-6), |
| 4.2-4.35 (m, 2H, H-5 and CH3 C HO), |
| and 4.54 ppm(ABq, JAB =13.96Hz, |
| Δν=24.56 Hz, 2H, SCH2). |
| 244 |
| ##STR608## 1 H NMR(200 MHz, D2 O)δ: |
| 1.31(d, J=6.33Hz, 3H, CH3 CHO), |
| 1.402.0(m, 4H, CH2 -1 and 2 of |
| propyl), 2.19(s, 3H, SCH3), 3.03(t, |
| J=7.0Hz, 2H, CH2 NH2), |
| 3.3-3.5(m, 2H, H-4 and H-6), 3.90(ABq, |
| JAB =13.7Hz, Δν=31.1Hz, |
| SCH2) and 4.2-4.4 ppm(m, 2H, H-5 and |
| CH3 C HO overlapping). |
| 245 |
| ##STR609## 1 H NMR(200 MHz, D2 O)δ: |
| 1.31(d, J=6.35Hz, 3H, CH3 CHO), |
| 1.8-2.3(m, 2H, CH2 CH2 NH2), |
| 1.90(s, C H3 CO2 H), 3.09 and |
| 3.26(2m, 2×3H, NCH3), 3.0-3.4(m, |
| 3H, H-4 and CH2 CH2 NH2), |
| 3.54(dd, JH6,H5 =3.1Hz, JH6,H1 = |
| 6.42Hz, 1H, H-6), 3.81(s, 2H, SCH2), |
| and 4.2-4.4 ppm(m, 2H, H-5 and CH3 |
| CH). |
| 246 |
| ##STR610## 1 H NMR(200 MHz, D2 O)δ: |
| 1.29(d, J=6.35Hz, 3H, CH3 CHO), |
| 1.3-2.0(m, 4H, CH2 -1 and 2 of |
| propyl), 2.18(s, 3H, SCH3), 3.3-3.5(m, |
| 4H, H-4, H-6 and CH2 -3 of propyl), |
| 3.89(ABq, JAB =13.69Hz, |
| Δν=29.0Hz, 2H, SCH2), |
| 4.15-4.3(m, 2H, H-5 and CH3 C HO), |
| 7.78 and 7.8 ppm(2s, 1H, C HN). |
| 247 |
| ##STR611## 1 H NMR(D2 O, 200 MHz)δ: |
| 9.72(0.2H, s, CHO); 5.10(0.5H, t, J=5.2 Hz, |
| CH(OH)2, hydrated form); 4.31-4.24(2H, |
| m, H-1' and one part of H-5), 4.267(dd, |
| J=2.6Hz, J=9.2Hz, part of H-5); 3.50(1H, |
| dd, J=5.8Hz, J=2.7Hz, H-6); 3.45-3.07(4H, |
| m, H-4, CH2 N, part of SCH2); |
| 3.01-2.84(1H, m, part of SCH2); |
| 2.77-2.67(0.7H, m, CH2 CO aldehydic |
| form); 2.31-2.20 and 1.99-1.46(4H, 2 sets |
| of m, CH2 CH2 -4) and 1.33 |
| ppm(3H, d, J=6.4Hz, CH3). |
| 248 |
| ##STR612## 1 H NMR(400 MHz, D2 O)δ: |
| 1.33(d, J=6.37Hz, 3H, CH3 CHO), |
| 1.7-1.85 and 2.05-2.15(2m, 2H, CH2 -1 |
| of ethyl), 1.92(s, CH3 CO2 H), |
| 3.12 and 3.28(2s, 2×3H, NCH3), |
| 3.2-3.4(m, 3H, H-4 and CH2 -2 of |
| ethyl), 3.55(dd, JH6,H5 =3.09Hz, |
| JH6,H1 =6.66Hz, 1H, H-6), 1.45(m, 1H, |
| CH3 C HO), and 4.31 ppm(dd, |
| JH5,H6 =3.09Hz, JH5,H4 =10.0Hz, |
| 1H, H-5). |
| 249 |
| ##STR613## 1 H NMR(200 MHz, D2 O)δ: |
| 1.31(d, J=6.34Hz, 3H, CH2 CHO), |
| 1.4-2.0 (m, 4H, CH2 1 and 2 of |
| propyl)2.21(s, 3H, SCH3), 3.2-3.5(m, |
| 4H, H- 4, H-6 and CH2 -3 of propyl), |
| 3.91(ABq, JAB =13.65Hz, |
| Δν=27.8Hz, 2H, SCH2) and |
| 4.2-4.4 ppm(m, 2H, H-5 and CH3 CHO). |
| 250 |
| ##STR614## 1 H NMR(400 MHz, D2 O)δ: |
| 1.33(d, J=6.38Hz, 3H, CH3 CHO), |
| 1.5-1.9(m, 4H, CH2 -1 and 2 of |
| propyl), 1.9-2.2(m, 4H, CH2 -3 and 4 |
| of pyrrolidine), 2.8-2.9(m, 2H, SCH2 |
| CH2 CN), 2.9-3.0 and 3.1-3.2(m, 2H, S |
| CH2 CH2 CN), 3.0-3.1, 3.2-3.3 and |
| 3.6-3.7(3m, 3×2H, CH2 -3 of |
| propyl and CH2 -2 and 5 of |
| pyrrolidine), 3.39(dd, JH6,H5 =2.66Hz, |
| H6,H1 =6.49Hz, 1H, H-6), 3.43(broad t, |
| 1H, H-4), and 4.25-4.35 ppm (m, 2H, H-5 and |
| CH3 CHO overlapping). |
| 251 |
| ##STR615## 1 H NMR(200 MHz, D2 O)δ: |
| 1.30(d, J=6.33Hz, 3H, CH3 CHO), |
| 1.4-2.0(m, 4H, CH2 -1 and 2 of |
| propyl), 2.54(s, 3H, CH3 -2 of |
| oxadiazole), 3.3- 3.5(m, 4H, H-6, H-4 and |
| CH2 -3 of propyl), 4.2-4.3(m, 2H, H-5 |
| and CH3 C HO), 4.53(ABq, JAB |
| =13.95Hz, Δν=20.0Hz, 2H, |
| SCH2) and 7.8 ppm(s, 1H, C HNH). |
| 252 |
| ##STR616## 1 H NMR(D2 O, 200 MHz)δ: |
| 4.22(d, J=2.6Hz, part of H-5), 4.35-4.21 |
| (1H, m, H-1'), 3.629(t, J=5.5Hz, CH2 |
| OH), 3.468(1H, dd, J=2.6Hz, J=6.0Hz, H-6), |
| 3.41-310(8H, m, H-4, CH2 N, CH2 |
| -pyrrolidine and part of SCH2), |
| 3.07-2.90(1H, m, part of SCH2), |
| 2.05(4H, m, CH2 - pyrrolidine), |
| 2.0-1.8, 1.8-1.4(4H, 2 sets of m, |
| CH2CH2 OH, CH2 -4) and 1.307 |
| ppm(3H, d, J=6.35Hz, CH3). |
| 253 |
| ##STR617## 1 H NMR(200 MHz, D2 O)δ: |
| 1.30(d, J=6.25Hz, 3H, CH3 CHO), |
| 1.4-1.9(m, 4H, CH2 -1 and 2 of |
| propyl), 2.54(s, 3H, CH3 -2 of |
| oxadiazole), 3.1-3.5 (m, 4H, H-4, H-6 and |
| CH2 -3 of propyl), 4.1-4.3(m, 2H, H-5 |
| and CH3 CHO), and 4.52 ppm(ABq, |
| JAB =14.3Hz, Δν=23.7Hz, 2H, |
| SCH2). |
| 254 |
| ##STR618## 1 H NMR(D2 O, 200 MHz)δ: |
| 4.317(d, J=2.1Hz, part of H-5), 4.38-4.24 |
| (1H, m, H-1'), 3.441(1H, dd, J=2.7Hz, |
| J=6.25 H&, H-6), 3.16-2.92 (1H, m, part of |
| SH2), 3.72-3.21(14H, m, H-4, NCH2 |
| -pyrrolidine, CH2 N and part of |
| SCH2), 2.07-2.05(8H, m, CH2 |
| -pyrroline), 1.92(2H, s, CH3 CO2), |
| 2.40-2.21, 1.87-1.65, 1.65-1.49(4H, 3 sets |
| of m, CH2 -4, CH2 CH2 N) and |
| 1.335 ppm(3H, d, J=6.3Hz, CH3). |
| 255 |
| ##STR619## 1 H NMR(D2 O, 200 MHz)δ: |
| 6.08-5.91(1H, m, H-vinylic), 5.74-5.64(2H, |
| m, CH2 -vinylic), 4.29(1H, d, J=3.0Hz, |
| part of H-5), 4.30-4.24(1H, m, H-1'), |
| 3.90(2H, d, J=7.0Hz, CH2), 3.40(1H, |
| dd, J=2.8Hz, J=6.6 Hz, H-6), 3.71-3.08(13H, |
| m, H-4, CH2 N, CH2 -pyrrolidine |
| and part of SCH2), 3.05-2.90(1H, m, |
| part of SCH2), 2.185(4H, m, CH2 |
| -pyrrolidine quat), 2.03(4H, m, CH2 |
| -pyrrolidine), 1.912(2H, s, CH3 |
| CHO2), 2.3-1.7 (3H, m, |
| CH2CH2 N, part of CH2 -4), |
| 1.65-1.54(1H, m, part of CH2 -4) and |
| 1.328 ppm(3H, d, J=6.3Hz, CH3). |
| 256 |
| ##STR620## 1 H NMR(D2 O, 400 MHz)δ: |
| 8.479(1H, d, J=5.1Hz, pyridine-H), 7.89- |
| 7.84(1H, m, pyridine-H), 7.527(1H, d, |
| J=7.8Hz, pyridine-H), 7.396- 7.364(1H, m, |
| pyridine H), 4.270, 4.235, 4.149, 4.114(2H, |
| ABq, J=13.9 Hz, CH2 -pyridine), |
| 4.27-4.20(1H, m, H-1'), 4.115-4.09(1H, |
| partly hidden H-5), 3.488(1H, dd, J=3.5Hz, |
| J=9.0Hz, H-6), 3.53-3.38(2H, m, CH2 |
| -4), 3.118(1H, dd, J=7.9Hz, J=13.94Hz, |
| H-4), 1.439(9H, s, tert-butyl) and 1.270 |
| ppm(3H, d, J=6.4Hz, CH3). |
| 257 |
| ##STR621## 1 H NMR(D2 O)δ: 1.26(d, 3H, |
| J=6.2Hz), 1.5-1.7(m, 1H), 1.8-2.0(m, 1H), |
| 2.38(t, 2H, J=7.5Hz), 2.7-3.4(m, 4H), |
| 3.32(s, 3H), 3.71(t, 2H, J=6.0Hz), 4.16(dd, |
| 1H, J=2.4, 9.4Hz), 4.23(m, 1H), 4.83-5.06 |
| (m, 2H), 7.49(s, 5H); HPLC purity 99%. |
| 258 |
| ##STR622## 1 H NMR(200 MHz, D2 O)δ: |
| 1.31(d, J=6.36Hz, 3H, CH3 CHO), |
| 1.3-2.0(m, 4H, CH2 -1 and 2 of |
| propyl), 3.15-3.3(m, 1H, H-4), 3.4(t, |
| J=6.1Hz, CH2 H3), 3.49(dd, |
| JH6,H5 =2.8Hz, JH6,H1 =5.55Hz, |
| 1H, H-6), 3.8(ABq, partially exchanged |
| D2 O, JAB =6.9Hz, |
| Δν=11.4Hz, SCH2), and 4.2-4.4 |
| pm(m, 2H, H-5 and CH3 C HO). |
| 259 |
| ##STR623## 1 H NMR(200 MHz, D2 O)δ: |
| 1.31(d, J=6.32Hz, 3H, CH3 CHO), |
| 1.8-2.3(m, 2H, CH2 CH2 N), |
| 2.72(s, 3H, NCH3), 2.7-3.05(m, 2H, |
| SCH2), 3.05-3.2(m, 2H, CH2 |
| CH2 N), 3.3-3.5(m, 2H, H-6 and H-4), |
| 3.73(t, J=6.0Hz, 2H, CH2 CH2 OH) |
| and 4.2-4.3 ppm(m, 2H, H-5 and CH3 |
| CHO). |
| 260 |
| ##STR624## 1 H NMR(200 MHz, D2 O)δ: |
| 1.31(d, J=6.35Hz, 3H, CH3 CHO), |
| 1.4-2.0(m, 4H, CH2 -1 and 2 of |
| propyl), 2.95(s, 3H, NCH3), 3.2(m, 1H, |
| H-4), 3.41 (t, J=6.05Hz, 2H, CH2 |
| N3), 3.49(dd, JH6,H5 =2.81Hz, |
| JH6,H1 =6.0Hz, 1H H-6), 3.8(s, |
| partially exchanged, SCH2) and 4.2-4.4 |
| ppm(m, 2H, H-5 and CH3 CHO). |
| 261 |
| ##STR625## 1 H NMR(200 MHz, D2 O)δ: |
| 1.34(d, J=6.28Hz, 3H, CH2 CHO), |
| 1.9-2.4(m, 2H, CH2 CH2 N), |
| 2.8-3.1(m, 2H, SCH2), 3.12 and |
| 3.30(2s, 3H, NCH3), 3.3- 3.5(m |
| overlapping with H-6, 1H, H-4), 3.41(dd, |
| JH6,H5 =2.43Hz, JH6,H1 = 6.93Hz, |
| 1H, H-6), 3.66(broad t, J=7.7Hz, 2H, |
| CH2 N), 3.75(t, J=6.1 Hz, 2H, CH2 |
| OH), and 4.2-4.4 ppm(m, 2H, H-5 and |
| CH3 CHO). |
| 262 |
| ##STR626## 1 H NMR(200 MHz, D2 O)δ: |
| (d, J=6.34Hz, 3H, CH3 CHO), |
| 1.4-2.0(m, 2H, CH2 -1 and 2 of |
| propyl), 1.92(s, CH3 CO2 H), |
| 2.95(s, 3H, NCH3), 3.05(t, J=7.0Hz, |
| 2H, CH2 NH2), 3.24(m, 1H, H-4), |
| 3.47(dd, JH6,H5 = 2.89Hz, JH6,H1 |
| =6.35Hz, 1H, H-6), 3.78(s, 2H, SCH2) |
| and 4.2-4.4 ppm (m, 2H, H-5 and CH3 |
| CH). |
| 263 |
| ##STR627## 1 H NMR(200 MHz, D2 O)δ: |
| 1.33(d, J=6.37Hz, 3H, CH3 CHO), |
| 1.8-2.3(m, 2H, CH2 CH2 N), |
| 2.75(s, 3H, NCH3), 2.8-3.25(m, 4H, S |
| CH2 CH2 O and CH2 CH2 |
| N), 3.42(dd, JH6,H5 =2.64Hz, |
| JH6,H1 =6.72Hz, 1H, H-6), 3.45(m |
| overlapping with H-6, 1H, H-4), and 4.2-4.4 |
| ppm(m, 2H, H-5 and CH3 CHO). |
| 264 |
| ##STR628## 1 H NMR(200 MHz, D2 O)δ: |
| 1.33(d, J=6.34Hz, 3H, CH3 CHO), |
| 1.9-2.55 (m, 4H, β-CH2 and |
| CH2 -4 of pyrrolidyl), 2.75(s, 3H, |
| NHCH3), 3.1-3.7 (m, 8H, |
| 2×CH2 N of pyrrolidyl, CH2 |
| NHCH3, H-4 and H-6), 4.0(m, 1H, SCH) |
| and 4.2-4.4 ppm(m, 2H, CH3 CHO and |
| H-5). |
| 265 |
| ##STR629## 1 H NMR(200 MHz, D2 O)δ: |
| 1.33(d, J=6.35Hz, 3H, CH3 CHO), |
| 1.5-2.0(m, 4H, CH2 -1 and 2 of |
| propyl), 1.92(s, CH3 CO2 H), |
| 3.05(broad t, J=7.0 Hz, 2H, CH2 |
| NH2), 3.3(m, 1H, H-4), 3.46(dd, |
| JH6,H5 =2.83Hz, JH6,H1 = 6.33Hz, |
| 1H, H-6), 3.79(ABq, JAB =15.8Hz, |
| Δν=6.4Hz, 2H, SCH2), and |
| 4.2-4.4 ppm(m, 2H, H-5 and CH3 CHO). |
| 266 |
| ##STR630## 1 H NMR(200 MHz, D2 O)δ: |
| 1.35(d, J=6.34Hz, 3H, CH3 CHO), |
| 1.8-2.3(m, 2H, CH2 CH2 N), |
| 2.9-3.2(m, 2H, SCH2), 3.11 and |
| 3.30(2s, 3H, NCH3), 3.3- 3.5(m |
| overlapping with H-6, 1H, H-4), 3.42(dd, |
| JH6,H5 =2.67Hz, JH6,H1 =7.0Hz, |
| 1H, H-6), 3.66(broad t, J=7.5Hz, 2H, |
| CH2 N), and 4.15- 4.4 ppm(m, 4H, H-5, |
| CH3 CHO and CH2 O). |
| 267 |
| ##STR631## 1 H NMR(D2 O)δ 1.34(d, 3H, |
| J=6.3Hz), 1.56-1.76(m, 1H), 2.07-2.44(m, |
| 3H), 2.73-3.20(m, 3H), 3.44(dd, 1H, J=2.5, |
| 6.1 Hz), 3.66-3.86(m, 2H), 4.23(dd, 1H, |
| J=2.5, 9.2Hz), 4.23(quin., 1H, J=6.2Hz); |
| HPLC purity 90%. |
| 268 |
| ##STR632## 1 H NMR(200 MHz, D2 O)δ: |
| 1.28(d, J=6.37Hz, 3H, CH3 CHO), |
| 1.5-1.85 and 1.95-2.2(2m, 2H, CH2 -1 |
| of ethyl), 2.70(s, 3H, NCH3), 3.0(t, |
| J=8.5Hz, 2H, CH2 N), 3.1-3.25(m, 1H, |
| H-4), 3.33(dd, JH6,H5 =2.82Hz, |
| JH6,H1 =6.66Hz, 1H, H-6), 4.05(m |
| overlapping with SCH2, 1H, H-5), |
| 4.09(ABq, JAB =13.8Hz, |
| Δν=22.1Hz, 2H, SCH2), 4.2(m, |
| 1H, CH3 CHO), 7.35(m, 1H, H-5 of |
| pyridine), 7.45(d, J=7.9Hz, 1H, H-3 of |
| pyridine), 7.83(m, 1H, H-4 of pyridine) and |
| 8.44 ppm(m, 1H, H-6 of pyridine). |
| 269 |
| ##STR633## 1 H NMR(400 MHz, D2 O)indicated a |
| 75:25 mixture of Z and E formamidi- nium |
| isomers: Major isomer δ: 1.24(d, |
| J=6.4Hz, 3H, CH3 CHO), 1.5-2.0 (m, |
| 2H, CH2 CH2 N), 2.95(m, |
| overlapping with NCH3, 1H, H-4), |
| 2.98(s, 3H, NCH3), 3.26(dd, |
| JH6,H5 =2.89Hz, JH6,H1 =6.95Hz, |
| 1H, H-6), 3.3- 3.6(m, 2H, CH2 |
| CH2 N), 4.02(dd, JH5, H6 =2.89Hz, |
| JH5,H4 =9.72Hz, 1H, H-5), 4.04(ABq, |
| JAB =13.96Hz, Δν=53.5Hz, 2H, |
| SCH2), 4.15(m, 1H, CH3 CHO), |
| 7.29-7.33(m, 1H, H-5 of pyridine), |
| 7.37-7.42(m, 1H, H-3 of pyridine), 7.76(s, |
| 1H, CHNH), 7.75-7.82(m, 1H, H-4 of |
| pyridine) and 8.39-8.42 ppm(m, 1H, H-6 of |
| pyridine). |
| 270 |
| ##STR634## 1 H NMR(D2 O, 400 MHz)δ: |
| 4.242(1H, dd, J=2.6Hz, J=9.3Hz, H-5), 4.30, |
| 4.288, 4.273, 4.257, 4.241(1H, 5 lines, |
| J=6.3Hz, J=6.2Hz, H-1'), 3.455(1H, dd, |
| J=2.7Hz, J=6.0Hz, H-6), 3.424(2H, t, J=6.0 |
| Hz, CH2 N3), 3.346-3.289(1H, m, |
| H-4), 3.081-2.972, 2.929-2.801(2H, 2 sets |
| of m, CH2S), 2.770, 2.753, 2.734(2H, 3 |
| lines, CH2 N), 3.20-2.60 (8H, m, |
| CH2 -piperazine), 2.644(3H, bs, |
| NCH3), 1.918-1.874, 1.750- 1.537(4H, 2 |
| sets of m, CH2 CH2 -4) and 1.330 |
| ppm(3H, d, J=6.4Hz, CH3). |
| 271 |
| ##STR635## 1 H NMR(200 MHz, D2 O)δ: |
| 1.33(d, J=6.32Hz, 3H, CH3 CHO), |
| 1.8-2.6(m, 4H, β-CH2 and CH2 |
| -4 of pyrrolidyl), 3.1 and 3.3(2s, 3H, |
| NHCH3), 3.2- 4.1(m, 9H, |
| 2×NCH2 of pyrrolidyl, CH2 |
| NHCH3, H-4, H-6 and SCH), 4.2-4.4(m, |
| 2H, CH3 # CHO and H-5) and 7.81, 7.90, |
| 8.00 ppm(3m, 2H, CHNH). |
| 272 |
| ##STR636## 1 H NMR(200 MHz, D2 O)δ: |
| 1.31(d, J=6.35Hz, 3H, CH3 CHO), |
| 1.4-2.0(m, 4H, CH2 -1 and 2 of |
| propyl), 1.93(s, CH3 CO2 H), |
| 3.1-3.35(m, 3H, H-4 and CH2 NH), |
| 3.39(dd, JH6,H5 =2.81Hz, JH6,H1 |
| =6.0Hz, 1H, H-6), 3.79 (AB system partially |
| exchanged with D2 O, SCH2), and |
| 4.2-4.4 ppm(m, 2H, H-5 and CH3 CHO). |
| 273 |
| ##STR637## 1 H NMR(D2 O, 400 MHz)δ: |
| 4.092(1H, 5 lines, J=6.3Hz, H-1'), 4.068 |
| (1H, dd, J=2.6Hz, J=9.4Hz, H-5), 3.478(2H, |
| t, J=6.2Hz, CH2 O), 3.260(1H, dd, |
| J=2.6Hz, J=6.1Hz, H-6), 3.165-3.109(1H, m, |
| H-4), 3.1-2.4(8H, bm, piparazine-H), |
| 2.877-2.876, 2.759-2.687(2H, 2 sets of m, |
| SCH2), 2.614-2.580(2H, m, CH2 N), |
| 2.530(3H, bs, NCH3), 1.75- 1.66, |
| 1.58-1.47, (2H, 2 sets of m, CH2 -4), |
| 1.46-1.27(2H, 2 sets of m, CH2) and |
| 1.159 ppm(3H, d, J=6.3Hz, CH3). |
| 274 |
| ##STR638## 1 H NMR(200 MHz, D2 O)δ: |
| 1.32(d, J=6.36Hz, 3H, CH3 CHO), |
| 1.91(s, 3H, OCH3), 1.9-2.4(m, 6H, |
| CH2 -1 of ethyl and CH2 -3,4 of |
| pyrrolidine), 2.73(s, 3H, NCH3), |
| 2.9-3.5(m, 11H, H-4, CH2 -2 of ethyl, |
| CH2 -2 and 5 of pyrrolidine and S |
| CH2 CH2 N), 3.49(dd, JH6,H5 |
| =2.97 Hz, JH6,H1 =6.46Hz, 1H, H-6), |
| and 4.2-4.4 ppm(m, 2H, H-5 and CH3 |
| CHO). |
| 275 |
| ##STR639## 1 H NMR(400 MHz, D2 O)δ: |
| 1.32(d, J=6.43Hz, 3H, CH3 CHO), |
| 1.7-1.85 and 2.0-2.1(2m, 2H, CH2 |
| CH2 N3), 2.96(s, 3H, NCH3), |
| 3.3(m, 1H, H-4), 3.38-3.45 and |
| 3.55-3.62(2m, 2H, CH2 CH2 |
| N3), 3.53(dd, JH6,H5 =2.95Hz, |
| JH6,H1 =6.18Hz, 1H, H-6), 3.82(A part |
| of a partly exchanged AB system, S |
| CH2), 4.27(m, 1H, CH3 CHO), and |
| 4.28 ppm(dd, JH5,H6 =2.95 Hz, |
| JH5,H4 =9.65Hz, 1H, H-5). |
| 276 |
| ##STR640## 1 H NMR(400 MHz, D2 O)δ: |
| 4.107(1H, center of 5 lines, J=6.4Hz, |
| J=6.7Hz, H-1'), 4.081(1H, dd, J=2.6Hz, |
| J=9.5Hz, H-5), 3.225(1H, dd, J=2.7Hz, |
| J=6.4Hz, H-6), 3.191, 3.185, 3.167, 3.161, |
| 3.143, 3.136(1H, 6 lines, H-4), |
| 2.907-2.863(2H, m, CH2 N), |
| 2.846-2.790, 2.749-2.678(2H, 2 sets of m, |
| CH2S), 2.636(3H, s, NCH3), |
| 3.3-2.56 (10H, m, NCH2), 1.903 and |
| 1.749(0.83 and 2.18H, CH3), 1.75-1.515 |
| .448-1.353(4H, 2 sets of m, CH2 |
| CH2 -4) and 1.162 ppm(3H, d, J=6.4 Hz, |
| CH3). |
| 277 |
| ##STR641## 1 H NMR(D2 O, 400 MHz)δ: |
| 4.273(1H, 5 lines, J=6.4Hz, H-1'), 4.38 |
| (1H, dd, J=2.6Hz, J=9.4Hz, H-5), 3.334(1H, |
| dd, J=2.6Hz, J=6.2Hz, H-6), 3.32-3.18(3H, |
| m, CH2 -guanidine and H-4), |
| 3.5-2.7(10H, series of m, CH2 N), |
| 3.03-2.70, 2.93-2.859(2H, 2 sets of m, |
| CH2 S), 2.859(3H, s, NCH3), |
| 1.923(1.6H, s, CH3 CO2), |
| 1.883-1.802, 1.763-1.592, 1.569-1.473(4H, |
| m, CH2 CH2 -4), and 1.319 ppm(3H, |
| d, J=6.3Hz, CH3). |
| 278 |
| ##STR642## 1 H NMR(400 MHz, D2 O)δ: |
| 1.32(d, J=6.36Hz, 3H, CH3 CHO), |
| 1.7-1.85 and 2.05-2.15(2m, 2H, CH2 -1 |
| of ethyl), 1.92(s, CH3 CO2 H), |
| 2.94(m, 3H, NH CH3), 3.2-3.4(m, 3H, |
| H-4 and CH2 -2 of ethyl), 3.51(dd, |
| JH6,H5 =3.04 Hz, JH6,H1 =6.70Hz, |
| 1H, H-6), 3.76 ABq, JAB =15.6Hz, |
| Δν=17.5Hz, 2H, SCH2), 4.27(m, |
| 1H, CH3 CHO), and 4.29 ppm(dd, |
| JH5,H6 =3.04Hz, JH5,H4 = 9.91Hz, |
| 1H, H-5). |
| 279 |
| ##STR643## 1 H NMR(400 MHz, D2 O)δ: |
| 1.32(d, J=6.35Hz, 3H, CH3 CHO), |
| 1.8-1.92 and 2.12-2.2(2m, 2H, CH2 -1 |
| of ethyl), 1.92(s, CH3 CO2 H), |
| 2.94 s, 3H, NCH3), 3.05-3.2(m, 2H, |
| CH2 -2 of ethyl), 3.29(m, 1H, H-4), |
| 3.53(dd, JH6,H5 =3.06Hz, JH6,H1 |
| =6.45Hz, 1H, H-6), 3.76(ABq, JAB |
| =15.6Hz, Δν= 11.9Hz, 1H, |
| SCH2), 4.28(m, 1H, CH3 CHO) and |
| 4.30 ppm(dd, JH5,H6 =3.06 Hz, |
| JH5,H4 =9.90Hz, 1H, H-5). |
| 280 |
| ##STR644## 1 H NMR(400 MHz, D2 O)δ: |
| 1.34(d, J=6.41Hz, 3H, CH3 CHO), |
| 1.85-1.95 and 2.25-2.35(2m, 2H, CH2 |
| CH2 N), 2.75(s, 3H, NCH3), |
| 3.16(m, 2H, CH2 CH2 N), 3.48(m, |
| 1H, H-4), 3.49(dd, JH6,H5 =2.93Hz, |
| JH6,H1 =6.62Hz, 1H, H-6), 3.80(ABq, |
| JAB =17.6Hz, Δν=42.1Hz, 2H, |
| SCH2), 4.29(m, 1H, CH3 CHO) and |
| 4.35 ppm(dd, JH5, H6 =2.93Hz, |
| JH5,H4 =9.69Hz, 1H, H-5). |
| 281 |
| ##STR645## 1 H NMR(D2 O, 400 MHz)δ: |
| 4.267(1H, dd, J=2.6Hz, J=12.1Hz, H-5); |
| 4.301-4.238(1H, m, H-1'), 3.63-3.573(1H, m, |
| part of CH2N3), 3.448 (1H, dd, |
| J=2.7Hz, J=6.2Hz, H-6), 3.50-3.378(2H, m, |
| part of CH2 N3 and H-4), |
| 3.055-2.985, 2.915-2.840(2H, 2 sets of m, |
| SCH2), 2.95-2.65 (10H, m, CH2 N), |
| 2.481(3H, s, NCH3), 2.123-2.038, |
| 1.863-1.772(2H, 2 sets of m, CH2 -4) |
| and 1.335 ppm(3H, d, J=6.4Hz, CH3). |
| 282 |
| ##STR646## 1 H NMR(400 MHz, D2 O)δ: |
| 1.32(d, J=6.38Hz, 3H, C H3 CHO), |
| 1.45-1.95(m, 4H, CH2 -1 and 2 of |
| propyl), 2.12(s, 3H, C H3 CO2), |
| 2.78-2.92(m, 2H, CH2 CN), 2.92-3.01 |
| and 3.12-3.2(2m, 2H, SCH2), 3.39(m, |
| 1H, H-4), 3.44 (dd, JH6,H5 =2.65Hz, |
| JH6,H1 =6.05Hz, 1H, H-6), 4.12-4.2(m, |
| 2H, C H2 OAc), 4.27(dd, JH5,H6 |
| =2.65Hz, JH5,H4 =9.25Hz, 1H, H-5) and |
| 4.28 ppm(m, 1H, CH3 C HO). |
| 283 |
| ##STR647## 1 H NMR(200 MHz, D2 O)δ: |
| 1.33(d, J: 6.30Hz, 3H, CH3 CHO), |
| 1.91(s, C H3 CO2 H), 1.8-2.3(m, |
| 6H, CH2 -1 of ethyl and CH2 -3 |
| and 4 of pyrrolidine), 3.09(s, 3H, |
| NCH3)3.0-3.8(m, 12H), 4.2-4.4(m, 2H, |
| H- 5 and CH3 C HO), 7.80 and 7.88 |
| ppm(2s, 1H, C HNH). |
| 284 |
| ##STR648## 1 H NMR(400 MHz, D2 O)δ: |
| 1.32(d, J=6.34Hz, 3H, CH3 CHO), |
| 2.75-1.85 and 2.0-2.15(2m, 2H, CH2 -1 |
| of ethyl), 3.3-3.38(m, 1H, H-4), 3.38- 3.45 |
| and 3.55-3.62(2m, 2H, CH2 -2 of |
| ethyl), 3.53(dd, JH6,H5 =2.91Hz, |
| JH6,H1 =6.17Hz, 1H, H-6), 3.8(AB |
| system partially exchanged), 4.27 (m, 1H, |
| CH3 C HO) and 4.29 ppm(dd, JH5,H6 |
| =2.91Hz, JH5,H4 =9.69Hz, 1H, H-5). |
| 285 |
| ##STR649## 1 H NMR(400 MHz, D2 O)this |
| product is a 8:2 mixture of Z and E |
| formamidinium isomers; major isomer |
| δ: 1.35(d, J=6.39H, 3H, CH3 |
| CHO), 1.9-2.0 and 2.25-2.35(2m, 2H, |
| CH2 -1 of ethyl), 3.11(s, |
| 3H, NCH3), 3.39-3.48(m, 1H, H-4), |
| 3.48(dd, JH5,H6 =2.97Hz, JH6,H1 |
| =6.85 Hz, 1H, H-6), 3.6-3.7(m, 2H, CH2 |
| -2 of ethyl), 3.79 ABq, JAB =17.55 |
| Hz, Δν=33.6Hz, 2H, SCH2), |
| 4.29(m, 1H, CH3 C HO), 4.35(dd, |
| JH5,H6 =2.97 Hz, JH5,H4 =9.70Hz, |
| 1H, H-5), and 7.89 ppm(s, 1H, C HNH); minor |
| somer δ: 1.36(d, J=6.31Hz, CH3 |
| CHO), 3.30(s, NCH3), |
| 3.53(dd, JH6,H5 =3.14Hz, JH6,H1 |
| =7.51Hz, H-6), 3.79(ABq, JAB =17.55Hz, |
| Δν=48.6 Hz, SCH2), 4.38(dd, |
| JH5,H6 =3.14Hz, JH5,H4 =9.93Hz, |
| H-5) and 7.80 ppm (s, C HNH). |
| 286 |
| ##STR650## 1 H NMR(D2 O, 400 MHz)δ: |
| 4.284(d, J=2.5Hz, part of H-5), 4.30-4.24 |
| (1H, m, H-1'), 3.435(1H, dd, J=2.5Hz, |
| J=6.6Hz, H-6), 3.42-3.31, 3.30-3.22(5H, 2 |
| sets of m, CH2 -guanidine, H-4 and |
| CH2 N), 2.97-2.923, 2.901-2.829(2H, 2 |
| sets of m, CH2 S), 3.4-2.74(8H, m, |
| CH2 -piperazine), 1.918(3H, s, |
| NCH3), 2.17-2.08, 1.37-1.25(2H, 2 sets |
| of m, CH2 -4), 1.918(2H, s, CH3 |
| CO2) and 1.335 ppm(3H, d, J=6.3Hz, |
| CH3). |
| 287 |
| ##STR651## 1 H NMR(400 MHz, D2 O)δ: |
| 1.33(d, J=6.35Hz, 3H, CH3 CHO), |
| 1.8-2.0 and 2.15-2.3(2m, 2H and 1H, |
| CH2 -1 of ethyl and H-3 of |
| pyrrolidine), 1.92 (s, CH3 CO2 |
| H), 2.75, 3.00 and 3.07(3s, 3×3H, |
| NCH3 and CON(CH3)2), |
| 2.9-3.1(m, 1H, H-3 of pyrrolidine), |
| 3.05-3.25(m, 2H, CH2 -2 of ethyl), |
| 3.34(m, 1H, H-4), 3.35(dd, Jgem |
| =12.32Hz, JH5,H4 =4.43Hz, 1H, H-5 of |
| pyrrolidine), 3.47(dd, JH6,H5 =2.96Hz, |
| JH6,H1 =6.60Hz, 1H, H-6), 3.56(dd, |
| Jgem =12.32Hz, JH5,H4 =6.05Hz, |
| 1H, H-5 of pyrrolidine), 3.87-3.95(m, 1H, |
| H-4 of pyrrolidine), 4.28(m, 1H, CH3 |
| CHO), 4.30(dd, JH5,H6 =2.96Hz, |
| JH5,H4 =9.74Hz, 1H, H-5), and 4.62 |
| ppm(broad t, J=8.5Hz, 1H, H-2 of |
| pyrrolidine). |
| 288 |
| ##STR652## 1 H NMR(200 MHz, D2 O). This |
| product is a mixture of Z and E (formimi- |
| dinium isomers: δ: 1.33(d, J=6.32Hz, |
| 3H, CH2 CHO), 1.8-2.3(m, 3H, CH2 |
| -1 of ethyl and H-3 of pyrrolidine), 2.98, |
| 2.99, 3.09 and 3.28(4s, total 9H, |
| NCH3), 3.0-4.2(m, 8H, H-4, H-6, |
| CH2 -2 of ethyl, H-3 of pyrrolidine, |
| H-4 of pyrrolidine and CH2 -5 of |
| pyrrolidine), 4.2-4.4(m, pyrrolidine, H-4 |
| of pyrrolidine and CH2 -5 of |
| pyrrolidine), 4.2-4.4(m, 2H, H-5 and |
| CH3 C HO), 5.06 and 7.8Hz(2t, J 7.7Hz |
| and J=7.8Hz, 1H, H-2 of pyrrolidine), 7.8, |
| 7.83, 7.89 and 8.09 ppm(4S, total 2N, |
| CHNH). |
| 289 |
| ##STR653## 1 H NMR(D2 O)δ: 4.29(1H, |
| dd, J: 2.82, J: 6.40, H-6). 4.28(1H, m, H- |
| 1'), 4.02(1H, unresolved s, SCH), |
| 3.5-4.0(4H, broad unresolved |
| m, CH2)2 N-pyrrolidine), 3.48(1H, |
| dd, J: 2.76, J: 5.96, H-5), 3.42(2H, t, J: |
| 6.41 CH2 N), 3.27(1H, m, H-4), 2.99, |
| 2.98(3H, 2s, 2 NCH3), 2.6 and 2.1(2H, |
| 2 unresolved m, 2 CH-4 of pyrrolidine), |
| 1.50-1.95(4H, m, 2 CH-1' , 2-CH-2"), |
| 1.33(3H, d, J: 6.44, 3-CH'). |
| 290 |
| ##STR654## 1 H NMR(D2 O)δ: 4.30(1H, |
| dd, J: 2.82, J: 6.91, H-6), 4.28(1H, m, H- |
| 1') 4.0(1H, m, CHS), 3.35-3.78 [5H, broad |
| unresolved m, CH2)2 N of pyrrolidi |
| ne; 3.43(1H, dd, J: 2.47, Jt 6.45, H-5)], |
| 3.30(1H, m, H-4), 3.05(2H, m, 2 CH-3"), |
| 2.96 and 2.95(3H, 2S, 2-NCH3), |
| 2.00-2.20 and 2.45-2.70(2H, 2 m, 2 CH-4 of |
| pyrrolidine), 1.92(s, CH3 CO2), |
| 1.50-1.95(4H, m, 2 CH-1" , 2 CH-2"), |
| 1.33(3H, d, J: 6.36, 3 CH-1'). |
| 291 |
| ##STR655## 1 H NMR(400 MHz, D2 O)δ: |
| 1.33(d, J=6.35Hz 3H, CH3 CHO), |
| 1.8-1.95 and 2.15-2.25(2m, 2H, CH2 -1 |
| of ethyl), 1.92(s, CH3 CO2 H), |
| 2.74(broad s, 9H, NCH3), 2.9-3.2(m, |
| 6H, S CH2 CH2 N and CH2 -2 |
| of ethyl), 3.34(m, 1H, H-4), 3.48(dd, |
| JH6,H5 =3.0Hz, JH6,H1 =6.50Hz, |
| 1H, H-6), 4.28(m, 1H, CH3 CHO) and |
| 4.30 ppm(dd, JH5,H6 =3.0Hz, |
| JH5,H4 =9.87Hz, 1H, H-5). |
| 292 |
| ##STR656## 1 H NMR(400 MHz)δ: 1.33(d, |
| J=6.44Hz, 3H, C H3 CHO), 1.4-2.0(m, |
| 4H, CH2 -1 and 2 of propyl), 3.13(s, |
| 3H, NCH3), 3.15-3.25(m, 1H, H-4), |
| 3.43(t, J=6.55Hz, 2H, CH2 N3), |
| 3.53(dd, JH6,H5 =3.0Hz, JH6,H1 |
| =6.0Hz, 1H, H-6), 3.8-4.0(m, 4H, CH2 |
| -4 and 5 of imidazoline), |
| 4.28(m, overlapping with H-5, 1H, CH3 |
| CHO), and 4.28 ppm(dd, JH5,H6 =3.0Hz, |
| JH5,H4 =9.9Hz, 1H, H-5). |
| 293 |
| ##STR657## 1 H NMR(400 MHz, D2 O)δ: |
| 1.33(d, J=6.36Hz, 3H, CH3 CHO), |
| 1.73-1.83 and 2.38-2.46(2×m, 2H, |
| β-CH2), 2.00-2.20(m, 4H, CH2 |
| -3' and CH2-4' of pyrrolidyl), 2.75-2.90(m, |
| 2H, CH2CN), 2.92-3.11(2m, 2H, SCH2), 3.30- |
| 3.45(m, 3H, H-6 and CH2N of pyrrolidyl), |
| 3.5(m, 1H, H04), 3.65(m, 1H, NCH-2' of |
| pyrrolidyl) and 4.24-4.33e ppm(m, 2H, CH3C |
| H and H-5). |
| 294 |
| ##STR658## 1 H NMR(200 MHz, D2 O)δ: |
| 1.32(d, J=6.38Hz, 3H, CH3 CHO), |
| 1.92(s, CH3 CO2 H), 1.8-2.0 and |
| 2.05-2.15(2m, 2H, CH2 -1 of ethyl)), |
| 3.0-3.2(m, 2H, CH2 -2 of ethyl), |
| 3.2-3.4(m, 1H, H-4)3.52(dd, JH6,H5 |
| =3.04Hz, JH6,H1 =6.45Hz, 1H, H-6), |
| 3.76(ABq, JAB =15.71Hz, |
| Δν=6.5Hz, 2H, SCH2), and |
| 4.2-4.4 ppm(m, 2H, H-5 and CH3 C HO |
| overlapping). |
| 295 |
| ##STR659## 1 H NMR(D2 O)δ 1.32(d, 3H, |
| J=6.3Hz), 1.6-1.9(m, 1H), 2.1-2.3(m, 1H), |
| 2.59(t, 2H, J=7.3Hz), 2.8-3.1(m, 2H), |
| 3.25(s, 3H), 3.3-3.4 (m, 1H), 3.46(dd, 1H, |
| J=2.3, 5.7Hz), 3.75(t, 2H, J=6.0Hz), 4.23 |
| (dd, 1H, J=2.3, 8.9 Hm), 4.27(quin, 1H, |
| J=6.3Hz); HPLC purity 99%. |
| 296 |
| ##STR660## 1 HMR(200 MHz, D2 O)mixture of E |
| and Z isomers of formamidinium δ: |
| 1.34(d, J=6.35Hz, 3H, CH3 CHO), |
| 1.92(s, CH3 CO2 H), 1.8-2.0 and |
| 2.1- 2.25(2m, 2H, CH2 -1 of ethyl), |
| 2.90(s, 6H, N(CH3)2), 3.11 and |
| 3.29 (2s, 3H, NCH3), 2.9-3.4(m, 5H, |
| H-4, SC H2 CH2 N), 3.51(dd, |
| JH6,H5 =2.95Hz, JH6,H1 =6.75Hz, |
| 1H, H-6), 3.6-3.8(m,2H,CH2 -2 of |
| ethyl), 4.2-4.4(m, 2H, H-5 and CH3 |
| CHO), 7.81 and 7.89 ppm(2s, 1H, C HNH). By |
| UV at 37°C in a pH 7.4 phosphate |
| buffer the half-life was measured to be |
| 10.3 h. |
| 297 |
| ##STR661## 1 H NMR(400 MH&, D2 O)δ: |
| 1.32(d, J=6.39Hz, 3H, CH3 CHO), |
| 1.73-1.85 and 2.15-2.3(2m, 2H, CH2 -l |
| of ethyl), 1.94(s, 3H, CH3 CO2 |
| H), 3.22-3.39(m, 3H, H-4 and CH2 -2 of |
| ethyl) , 3.51(dd, JH6,H5 =3.01Hz, |
| JH6 H1 =6.66Hz, 1H, H-6), 3.77(ABq, |
| JAB =15.69Hz, Δν=16.24Hz, 2H, |
| SCH2), 4.27(m, 1H, CH3 CHO), and |
| 4.30 ppm(dd, JH5.H6 =3.01Hz, |
| JH5,H4 =9.89Hz, 1H, H- 5). By UV at |
| 37°C in pH 7.4 phosphate buffer |
| the half-life was measured to be 13 h. |
| 298 |
| ##STR662## 1 H NMR(400 MHz, D2 O)δ: |
| 1.35(d, 3H, CH3, J=7.05Hz), 1.64-1.73; |
| 1.98- 2.07(m, 2H, CH2), 2.02(s, 3H, |
| COCH3), 2.82-2.86(m, 2H, CH2 CN), |
| 2.91- 3.12(m, 2H, SCH2), |
| 3.2-3.37(overlap, 3H, H-4, CH2 NH), |
| 3.56(dd, 1H, H-6, J5,6 =2.755Hz, |
| J6,1 =6.01Hz), 4.27(dd, 1H, H-5, |
| J4,5 =9.38Hz), 4.29 (q, 1H, H-1'). |
| 299 |
| ##STR663## 1 H NMR(400 MHz, D2 O): (8:2 |
| mixture of Z and E formamidinium isomers) |
| major isomer δ: 1.34(d, J=6.39Hz, 3H, |
| CH3 CHO), 1.8-2.3(2m, 2H, CH2 |
| CH2 N), 2.9-3.2(m, 2H, SCH2), |
| 3.12(s, 3H, NCH3), 3.38(m, 1H, H-4), |
| 3.41(dd, JH6,H5 =2.8Hz, JH6,H1 |
| =6.95Hz, 1H, H6), 3.65(m, 2H, CH2 N), |
| 4.2-4.35(m, 2H, H-5 and CH3 CHO), |
| 4.5-4.75(m, JH,F =46.7Hz, 2H, CH2 |
| F) and 7.9 ppm(s, 1H, C HNH); minor isomer |
| δ: 1.35(d, J=6.32H, C H3 CHO), |
| 3.30(s, NCH3), 3.46(dd, JH6,H5 |
| =2.97Hz, JH6,H1 =7.53Hz, H- 6) and |
| 7.83 ppm(s, C HNH). |
| 300 |
| ##STR664## 1 H NMR(400 MHz, D2 O)δ: |
| 1.35(d, J=6.43Hz, 3H, CH2 CHO), |
| 1.85-1.95 and 2.15-2.25(2m, 2H, CH2 |
| CH2 N), 2.75(s, 3H, NCH3), |
| 2.9-3.3(m, 4H, SCH2 and C H2 N), |
| 3.42(dd, JH6,H5 =2.87Hz, JH6,H1 |
| =6.65Hz 1H, H-6), 3.43(m, 1H, H-4), |
| 4.26(dd, JH5,H6 =2.87Hz, JH5,H4 |
| =9.45Hz, 1H, H-5), 4.27(m, 1H, CH3 |
| CH) and 4.55-4.75 ppm(2m, JHF =46.8Hz, |
| 2H, CH2 F). |
| 301 |
| ##STR665## 1 H NMR(400 MHz, D2 O)d: 1.33(d, |
| J=6.40Hz, 3H, C H3 CHO), 1.86-1.94 and |
| .25-2.34(2m, 2H, β-C H2), |
| 2.0-2.5(m, 4H, CH2 -3' and CH2 |
| -4' of pyrroli- dyl), 2.75-2.90(m, 2H, |
| CH2 CN), 2.90-3.1(2m, 2H, SCH2), |
| 3.4(m, 1H, H-6), 3.5-3.6(m, 3H, NCH2 |
| of pyrrolidyl and H-4), 4.05(m, 1H, NCH- 2' |
| of pyrrolidyl), 4.25-4.35(m, 2H, CH3 C |
| HO and H-5) and 8.00 ppm(s, 1H, CHNH). |
| 302 |
| ##STR666## 1 H NMR(400 MHz D2 O)δ: |
| 1.33(d, J=6.42Hz, 3H, CH3 CHO), |
| 1.5-2.0(m, 4H, CH2 -1 and 2 of |
| propyl), 1.92(s, C H3 CO2 H), |
| 3.06(m, 4H, CH2 NH2), 3.12(s, 3H, |
| NCH3), 3.25(m, 1H, H-4), 3.50(dd, |
| JH6,H5 =3.00Hz, JH6,H1 =6.29Hz, |
| 1H, H-6), 3.75-4.0(m, 6H, SCH2 and |
| CH2 -4 and 5 of imidazoline), 4.28(m, |
| 1H, CH3 C HO) and 4.30 ppm(dd, |
| JH5,H6 =3.00Hz, JH5,H4 =9.95Hz, |
| 1H, H-5). |
| 303 |
| ##STR667## 1 H NMR(200 MHz, D2 O)δ: |
| 1.29(d, J=6.35Hz, 3H, CH2 CHO), |
| 1.3-1.9(m, 4H, CH2 -1 and 2 of ethyl), |
| 1.9(s, CH3 CO2 H), 3.09(s, 3H, |
| NCH3), 3.42 (dd, JH6,H5 =2.83Hz, |
| JH6,H1 =6.00Hz, 1H, H-6), 3.0-3.4 and |
| 3.6-4.0(m, 9H, H-4, CH2 -3 of propyl, |
| SCH2 and CH2 -4 and 5 of |
| imidazoline), and 4.2-4.4 ppm(m, 2H, H-5 |
| and CH3 C HO). |
| 304 |
| ##STR668## 1 H NMR(400 MHz, D2 O)δ: |
| 1.33(d, J=6.40Hz, 3H, C H3 CHO), |
| 1.85-1.95 and 2.15-2.25(2m, 2H, CH2 -1 |
| of ethyl), 1.93(5, C H3 CO2 H), |
| 2.75 and 2.86 (2s, 2×3H, NCH3), |
| 2.7-3.3(series of m, 14H, CH2 -2 of |
| ethyl, S CH2 CH2 N and CH2 |
| of piperazine), 3.36(m, 1H, H-4), 3.44(dd, |
| JH6,H5 =2.89Hz, JH6,H1 =6.60Hz, |
| 1H, H-6) 4.27(m, 1H, CH3 C HO) and |
| 4.28 ppm(dd, JH5,H6 =2.89Hz, |
| JH5,H4 =9.71Hz, 1H, H-5). |
| 305 |
| ##STR669## 1 H NMR(200 MHz, D2 O)δ: |
| 1.34(d, J=6.34Hz, 3H, CH3 CHO), |
| 1.8-2.3(2m, 2H, CH2 -1 of ethyl), |
| 1.94(s, CH3 CO2 H), 2.87, 3.11 |
| and 3.3(3s, total 6H, NCH3), |
| 2.7-3.4(broad series of m, 13H, H-4, S |
| CH2 CH2 N and CH2 of |
| piperazine), 3.45(dd, JH6,H5 =2.68 Hz, |
| JH6,H1 =6.79Hz, 1H, H-6), 3.66(m, 2H, |
| CH2 -2 of ethyl), 4.2-4.4(m, 2H, H-5 |
| and CH2 C HO), 7.81 and 7.90 ppm(2s, |
| 1H, C HNH. |
| 306 |
| ##STR670## 1 H NMR(200 MHz, CDCl3)δ: |
| 1.41(d, J=6.17Hz, 3H, CH3 CHO), |
| 1.4-1.7 and 2.1-2.3(2m, 2H, CH2 |
| CH2 N), 2.97(s, 3H, NCH3), |
| 2.8-3.6(series of m, 8H, H-4, H-6, |
| SCH2 CH2 N3 and CH2 C |
| H2 N), 4.1-4.3(m, 1H, CH3 CHO), |
| 4.26(dd, JH5, H6 =2.96Hz, JH5,H4 |
| =10.12Hz, 1H, H-5), 4.5-4.9(m, 4H, CH2 |
| of allyl), 5.2-5.5 and 5.8-6.1 ppm(2m, 4H |
| and 2H, CH of allyl). |
| 307 |
| ##STR671## 1 H NMR(400 MHz, D2 O): the |
| product in a 8:2 mixture of Z and E |
| formamidinium isomers; major isomer |
| δ: 1.34(d, J=6.36Hz, 3H, CH3 |
| CHO)1.85-2.0 and 2.15-2.25(m, 2H, CH2 |
| CH2 N), 2.85-3.1(m, 2H, SCH2), |
| 3.12(s, 3H, NCH3) 3.39(m, 1H, H-4), |
| 3.42(dd, JH6,H5 =2.83Hz, JH6,H1 |
| =6.91Hz, 1H, H-6), 3.55(m, 2H, CH2 |
| N3), 3.66(m, 2H, CH2 N), 4.25- |
| 4.35(m, 2H, H-5 and CH3 CHO) and 7.91 |
| ppm(s, 1H, CHNH): minor isomers: 1.35(d, |
| J=6.34Hz, C H3 CHO), 3.30(s, |
| NCH3), 3.47(dd, JH6,H1 =2.94Hz, |
| JH6,H4 =7.54Hz, H-6), and 7.83 ppm(s, |
| C HNH). |
| 308 |
| ##STR672## 1 H NMR(400 MHz, D2 O)δ: |
| 1.29(d, 3H, CH3, J=6.17 Hz), |
| 1.65-1.75; 2.0- 2.1(m, 2H, CH2), |
| 2.9-3.05(m, 2H, CH2 N), 3.2(dt, 1H, |
| H-4, J4,5 =9.94 Hz), 3.34(dd, 1H, H-6, |
| J5.6 =2.83Hz, J6, 6.48Hz, 4.0, |
| 4.11(AB, 2H, SCH2, J=13.69Hz), |
| 4.11(dd, 1H, H-5), 4.22(q, 1H, H-1'), |
| 7.41-7.43 (m, 5H, phenyl). |
| 309 |
| ##STR673## 1 H NMR(D2 O)δ: 4.30(1H, |
| dd, J=2.87, 9.68, H-5), 4.26(1H, m, H-1'), |
| 4.08(1H, m, SCH), 4.0-3.8(1H, unresolved m, |
| NCH pyrrolidine), 3.70-3.55(2H, 2 m, |
| CHN3, NCH pyrrolidine), 3.5(1H, dd, |
| J=2.80, 6.14, H-6), 3.45-3.30(3H, m, H-4, |
| CH3, NCH pyrrolidine), 3.30-3.10 (1H, |
| unresolved m, NCH pyrrolidine), 3.00 and |
| 2.96(3H, 2S, 2 NCH3), 2.8-2.4(1H, |
| unresolved m, CH-4 pyrrolidine), |
| 2.25-1.97(2H, unresolved m, CH-4 |
| pyrrolidins, C-H-1"), 1.87-1.75(1H, |
| unresolved m, CH-1"), 1.31(3H, d, J=6.36, |
| CH3 '). |
| 310 |
| ##STR674## 1 H NMR(D2 O)δ: |
| 4.35-4.25(2H, 2m, H-1', H-6), 4.0(1H, m, |
| SCH), 3.8-3.6(2H, unresolved m, 2NCH |
| pyrrolidine), 3.50(1H, 2dd, J': 2.94, 6.44, |
| J2 : 2.74, 6.30, H-5), 3.45-3.37(2H, |
| unresolved m, 2 NCH pyrrolidine), 3.33(1H, |
| dt, J: 3.4, 10.2, H-4), 3.14(2H, m, |
| CH2 N), 2.98 and 2.97(3H, 2S, |
| NCH3), 2.7-2.5(1H, m, CH-4 |
| pyrrolidine), 2.25-2.00(2H, m, CH-4 |
| pyrrolidine, CH-1"), 1.92(3H, s, acetate), |
| 1.95-1.70(1H, m, CH-1"), 1.33(3H, d, J: |
| 6.38, CH3 '). |
| 311 |
| ##STR675## 1 H NMR(200 MHz, water)δ: |
| 1.34(d, J=5.88Hz, 3H, CH3 CHO), |
| 1.8-2.3 (2m, 2H, CH2 CH2 |
| NCH3), 1.93(s, CH3 CO2 H), |
| 2.8-3.8(m, 7H, H-4, SC H2 C H2 N, |
| CH2 C H2 NCH3), 3.10(s, 3H, |
| NCH3), 3.48(dd, JH6,H5 =2.69Hz, |
| JH6,H1 =6.79Hz, 1H, H-6), 4.2-4.4(m, |
| 2H, H-5 and CH3 CHO), 7.81 and 7.90 |
| ppm(2s, 1H, CHNH). |
| 312 |
| ##STR676## 1 NMR(D2 O, 400 MHz)δ: |
| 4.254(1H, dd, J=2.7Hz, J=9.4Hz, H-5), |
| 4.301- 4.239(1H, dq, J=6.2Hz, J=6.3Hz, |
| H-1'), 3.789-3.733, 3.645-3.581 (2H, 2 sets |
| of m, CH2O), 3.436(1H, dd, J=2.6Hz, |
| J=6.0Hz, H-6), 3.432, 3.376(1H, m, H-4); |
| 3.055-3.008, 2.920-2.822(2H, 2 sets of m, |
| CH2S), 3.0-2.64(10H, m, CH2 N), |
| 2.544(3H, s, NCH3), 2.095-2.012, |
| 1.802-1.725(2H, 2 sets of m, CH2 -4) |
| and 1.321 ppm(3H, d, J=6.4Hz, CH3). |
| 313 |
| ##STR677## 1 H NMR(400 MHz, D2 O)δ: |
| 1.32(d, J=6.38Hz, 3H, CH3 CHO), |
| 1.75-1.85 and 2.02-2.11(2m, 2H, CH2 -1 |
| of ethyl), 3.13(s, 3H, NCH3), 3.32(m, |
| 1H, H-4), 3.39-4.8 and 3.55-3.64(2m, 2H, |
| CH2 N3), 3.56(dd, JH6,H5 |
| =3.0Hz, JH6,H1 =6.13Hz, 1H, H-6), |
| 3.8-4.0(m, 4H, CH2 -4 and 5 of |
| imidazoline), 4.27(m, 1H, CH3 CHO) and |
| 4.31 ppm(dd, JH5,H6 =3.0Hz, |
| JH5,H4 =10.03Hz, 1H, H-5). |
| 314 |
| ##STR678## 1 H NMR(D2 O, 400 MHz)δ: |
| 4.263(2H, dd, J=2.8Hz, J=9.6Hz, H-5), |
| 4.299- 4.235(1H, dq, J=6.2Hz, J=6.4Hz, |
| H-1'), 3.634-3.573, 3.466-3.372 (2H, 2 sets |
| of m, CH2 N3), 3.454(1H, dd, |
| J=2.8Hz, J=6.2Hz, H-6), 3.444-3.372(1H, m, |
| H-4), 3.303, 2.91, 3.277(4H, 3 lines, |
| CH2 N- piparazine), 3.066-2.998, |
| 2.934-2.878(2H, 2 sets of m, SCH2), |
| 2.896- 2.857(4H, m CH2 N piperazine), |
| 2.786, 2.769, 2.751(2H, m, CH2 N), |
| 2.122-2.037, 1.863-1.772(2H, 2 sets of m, |
| CH2 -4) and 1.331 ppm(3H, dq J=6.3Hz, |
| CH3. |
| 315 |
| ##STR679## 1 H NMR(D2 O, 400 MHz)δ: |
| 4.38(1H, dd, J=2.9Hz, J=9.6Hz, H-5); 4.31 |
| (1H, quint, J=6.2Hz, H-1'); 3.86-3.80(1H, |
| m, H-4); 3,62(1H, dd, J=2.9Hz, J=5.5Hz, |
| H-6); 3.23-3.16(1H, m, part of SCH2); |
| 3.02-2.89 (3H, m, part of SCH2, |
| CH2 CN-3); 2.86-2.83(2H, m, CH2 |
| CN-4) and 1.33 ppm (3H, d, J=6.4Hz, |
| CH3). |
| 316 |
| ##STR680## 1 H NMR(D2 O, 400 MHz)δ: |
| 4.286(1H, dd, J=2.55Hz, J=6.93Hz, H-5), |
| 4.32-4.24(1H, m, H-1'), 3.435(1H, dd, |
| J=2.6Hz, J=6.75Hz, H-6) 3.42-3.33, |
| 3.32-3.22(3H, 2 sets of m, CH2NH, |
| H-4), 3.284(4H, t, J=5.2Hz, CH2 |
| -guanidine), 3.0-2.8(2H, m, SCH2), |
| 2.88-2.82(4H, m, CH2 -guanidine), |
| 2.741(2H, t, J=7.25Hz, CH2 N), |
| 2.18-2.05, 1.85-1.72 (1H, 2 sets of m, |
| CH2 -4), 1.918(2H, S, CH3 |
| CO2) and 1.337 ppm(3H, d, J=6.34Hz, |
| CH3). |
| 317 |
| ##STR681## 1 H NMR(400 MHz, D2 O)δ: |
| 8.475(1H, d, J=4.5Hz, pyridine-H), |
| 7.88-7.83 1H, m, pyridine-H 7.524(1H, d, |
| J=7.9Hz, pyridine-H), 7.413-7.362 (1H, m, |
| pyridine-H), 4.235, 4.199, 4.098, 4.063(2H, |
| ABq, J=14.3Hz, CH2 -pyridine), |
| 4.191-4.147(1H, 7 lines, J=2.8H, J=5.5H, |
| H-5), 3.370, 3.357, 3.327, 3.314(1H, part |
| of ABX, J=5.5Hz, J=17.1Hz, H-6- β), |
| 3.35-3.25(2H, m, CH2 N3), |
| 3.17-3.10(1H, m, H-5), 3.060, 3.053, 3.017, |
| 3.010(1H, part of ABX, J=2.8Hz, J=17.1Hz, |
| H-16-α), 1.70- 1.54, 1.52-1.40 and |
| 1.37-1.27 ppm(4H, 3 sets of m, CH2 |
| CH2 -4). |
| 318 |
| ##STR682## 1 H NMR(200 MHz, D2 O)δ: |
| 8.46(1H, d, J=4.2Hz, pyridine-H), 7.90-7.81 |
| 1H, m, pyridine-H), 7.52(1H, d, J=7.9Hz, |
| pyridine-H), 7.40-7.20 (1H, m, pyridine-H), |
| 4.228-4.158, 4.109, 4.038(2H, ABq, |
| J=14.1Hz, CH2), 4.22-4.11(1H, m, H-5), |
| 3.415, 3.388, 3.329, 3.302(1H, part of ABX, |
| J=5.4Hz, J=17.2Hz, H-6β), |
| 3.231-3.134(1H, m, H-4), 3.060, 3.046(2 |
| lines of ABX, J=2.8Hz, part of H-6α), |
| 3.001-2.93, 2.3H, m, CH2 N and part of |
| H-6α) and 1.729-1.55, 1.487-1.313 |
| ppm(4H, 2 sets of m, CH2 CH2 |
| __________________________________________________________________________ |
| -4). |
When the general procedures of the foregoing text and examples are repeated with the appropriate intermediate and mercaptan compound, there is thereby produced a compound or salt thereof having the formula ##STR683## wherein B--R3 is ##STR684##
When the general procedures of the foregoing text and examples are repeated with the appropriate intermediate and mercaptan compound, there is thereby produced a compound or salt thereof having the formula ##STR685## wherein B--R3 is ##STR686##
Bachand, Carol, Martel, Alain, Menard, Marcel
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| EP71908, |
| Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc |
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